Annamaria Celli

Annamaria Celli
University of Bologna | UNIBO · Department of Civil, Chemical, Environmental and Materials Engineering DICAM

PhD

About

121
Publications
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Publications

Publications (121)
Article
Full-text available
The use of bioplastic mulch in agriculture has increased dramatically in the last years throughout the world. Nowadays, biodegradable materials for mulching films strive to constitute a reliable and more sustainable alternative to classical materials such as polyethylene (PE). The main challenge is to improve their durability in the soil to meet th...
Article
Full-text available
Commercial hydrolytic enzymes belonging to different subclasses (several lipases, proteinase k, cutinase) were investigated for their ability to degrade different aliphatic polyesters, i.e., poly(butylene succinate) (PBS), poly(butylene succinate-co-adipate) (PBSA), two poly(caprolactone), having two different molecular weights, poly(lactic acid) (...
Article
The management of grape pomace (GP), the main winery solid residue, is presently favoured by government subsidies, promoting the energetically expensive recovery of ethanol by distillation. This work proposes and assesses a novel sustainable alternative GP valorisation strategy: the chain elongation fermentation. Besides, the proof-of-concept of a...
Article
The temperature dependence of the constrained amorphous interphase or rigid amorphous fraction (RAF) in bio-based semi-crystalline poly(ethylene 2,5-furandicarboxylate) (PEF) was assessed. RAF, which is located in proximity of the basal crystal planes, was found to develop in parallel with the crystal phase during crystallization at the lowest inve...
Article
Full-text available
When considered by a biorefinery approach, an agroindustrial byproduct such as wheat bran can find a new standing in the field of fabrication of mycelium-based materials. The present work reports on a systematic study on the effect of wheat bran as an upgrading feedstock for the growth and development of fully biobased and biodegradable composites....
Article
Nowadays the issues related to the end‐of‐life of traditional plastics are very urgent due to the important pollution problems that plastics have caused. Biodegradable plastics can help to try to mitigate these problems, but even bioplastics need a great attention to carefully evaluate the different options for plastic waste disposing. In this pape...
Article
Full-text available
In recent years, the circular economy and sustainability have gained attention in the food industry aimed at recycling food industrial waste and residues. For example, several plant-based materials are nowadays used in packaging and biofuel production. Among them, by-products and waste from coffee processing constitute a largely available, low cost...
Article
Full-text available
In situ intercalative polymerization has been investigated as a strategic way to obtain poly(propylene 2,5-furandicarboxylate) (PPF) and poly(hexamethylene 2,5-furandicarboxylate) (PHF) nanocomposites with different graphene types and amounts. Graphene (G) has been dispersed in surfactant stabilized water suspensions. The loading range in composite...
Article
Full-text available
With the aim to fully exploit the by-products obtained after the industrial extraction of starch from sweet potatoes, a cascading approach was developed to extract high-value molecules, such as proteins and pectins, and to valorize the solid fraction, rich in starch and fibrous components. This fraction was used to prepare new biocomposites designe...
Article
Full-text available
The dynamic and equilibrium water vapor sorption properties of amorphous and highly crystalline poly(ethylene vanillate) (PEV) films were determined via gravimetric analysis, at 20 °C, over a wide range of relative humidity (0–95% RH). At low RH%, the dynamic of the sorption process obeys Fick’s law while at higher relative humidity it is character...
Article
Full-text available
Agro-waste reduction and reuse are among the current main social challenges. In this perspective , the present research was aimed at the complete valorisation of Garganega grape pomace by recovering bioactive phenol extracts and by testing the solid fibre extract residues in composite formulation for packaging applications. The pomace was derived f...
Article
Full-text available
Two winery residues, namely vine shoots (ViSh) and wine pomace (WiPo), were up-cycled as fillers in PHBV-based biocomposites. Answering a biorefinery approach, the impact of a preliminary polyphenols extraction step using an acetone/water mixture on the reinforcing effect of fillers was assessed. Biocomposites (filler content up to 20 wt%) were pre...
Article
Poly(ricinoleic acid) (PRA), coming from the self-polycondensation of ricinoleic acid (RA), which derives from castor oil, is a very interesting polymer because of its intrinsic antimicrobial activity. However, its mechanical properties are insufficient for whatever application, thus copolymerization is required. In this work, two polyesters based...
Article
Furandicarboxylate-based polyesters are considered an interesting class of bio-based polymers, due to their improved properties with respect to the petrol-based terephthalate homologues. An in-depth analysis of the crystal structure of poly(propylene 2,5-furandicarboxylate) (PPF), after maximum possible removal of the catalyst, was carried out. The...
Article
Polybutylene succinate (PBS) were processed in melt extrusion by dispersion of organo-modified layered double hydroxide (LDH). Depending on the organic anion interleaved into LDH fillers (L-tyrosine (TYR), L-tryptophan (TRP), L-ascorbate (ASA) and 3-(4-hydroxyphenyl)propionate (HPP)), it was possible to control and tune the properties of the result...
Article
Full-text available
The world is confronted with the depletion of natural resources due to their unsustainable use and the increasing size of populations. In this context, the efficient use of by-products, residues and wastes generated from agro-industrial and food processing opens the perspective for a wide range of benefits. In particular, legume residues are produc...
Article
3-(4-hydroxyphenyl)propionic acid, intercalated in Mg2Al/layered double hydroxide has been used as filler in biopolyesters containing succinate moiety, such as poly(propylene succinate) (PPS), poly(butylene succinate-co-butylene adipate) (PBSA) and poly(butylene succinate) (PBS) with the aim of inducing an effect similar to that of an increment of...
Article
Full-text available
The paper aims at optimising and validating possible routes toward the full valorisation of grape agrowaste to produce bioactive molecules and new materials. Starting from Merlot red pomace, phenol complex mixtures were successfully extracted by using two different approaches. Extracts obtained by solvent-based (SE) technique contained up to 46.9 g...
Article
The proof of concept for a new copolymerization approach taking advantage of the thermally reversible aptitude of the furan/maleimide Diels–Alder (DA) adducts is reported here. A new monomer bearing two carboxylic acids as end‐groups and a Diels–Alder adduct within its structure is synthesized using benign and mild reaction conditions. Two polyeste...
Article
Full-text available
Olive mill wastewater (OMW) is the aqueous waste derived from the production of virgin olive oil. OMW typically contains a wide range of phenol-type molecules, which are natural antioxidants and/or antibacterials. In order to exploit the bioactive molecules and simultaneously decrease the environmental impact of such a food waste stream, OMW has be...
Article
Semiaromatic polyamides belong to a large family of polymers commonly utilized in demanding engineering applications due to a unique set of outstanding mechanical properties as well as in terms of thermal and chemical resistance. Somewhat less understood is the use of certain members of this family in packaging applications such as the manufacturin...
Article
Poly(ethylene 2,5-furandicarboxylate) (PEF) is considered today as a very promising bio-based polymer for packaging applications. Most often scientific literature describes synthetic procedures based on the transesterification of the dimethylester of the 2,5-furandicarboxylic acid, whereas this paper aims at studying the possibility of a practical...
Article
Full-text available
Polybutylene succinate (PBS) nanocomposite materials were prepared using a melt compounding process. The Mg2Al-based PBS nanocomposites, dispersed with inorganic–organic hybrid materials (layered double hydroxides, LDHs), were functionalized with the amino acids L-histidine (HIS) and L-phenylalanine (PHE). The rheological and anti-ultraviolet (anti...
Article
Olive Mill wastewater (OMW) is a food waste stream resulting from the production of virgin olive oil, rich in valuable natural biocompounds, such as vanillic acid, ferulic acid, protocatechuic acid, etc. In order to decrease its environmental impact and to exploit the antioxidant properties of its phenol-type molecules, OMW was intercalated into Zn...
Article
A new building block, derived from dimethyl itaconate, has been synthesized through thia-Michael addition reaction and, then, exploited for the synthesis of a series of novel aliphatic polyesters. The new monomer, the dimethyl 2-((octylthio)methyl)succinate, demonstrated a remarkable stability toward common conditions of polycondensation (high temp...
Chapter
The development of high-performance materials made from natural resources is increasing worldwide. Within this framework, natural fiber reinforced polymeric composites now experience great expansion and applications in many fields, ranging from the automotive to the construction sector. The great challenge in producing composites containing natural...
Article
For the academic and industrial research that aims at substituting plastics derived from fossil feedstock with bio-based alternatives, the furandicarboxylate-based polyesters are a very promising family of materials, because they exhibit enhanced properties for advanced applications. In order to lay the foundation for the comprehension of the relat...
Article
Poly(hexamethylene isophthalamide) (PA6I), an amorphous polymer characterized by high temperature resistance and significant oxygen barrier performances, has been chemically modified, by using the 5-sulfoisophthalic acid sodium salt as a co-monomer. Then, ionic groups have been randomly distributed along the polymeric chains. The new sulfonated PA6...
Article
Full-text available
Agricultural waste is a huge pool of untapped biomass resources that may even represent economic and environmental burdens. They can be converted into bioenergy and bio-based products by cascading conversion processes, within circular economy, and should be considered residual resources. Major challenges are discussed from a transdisciplinary persp...
Article
Hybridization of layered double hydroxide (LDH) platelets of Zn2Al cation intra-sheet composition was performed with L-tyrosine (TYR), L-tryptophan (TRP) and 3-(4-hydroxyphenyl) propionic (HPP) acid, and the hybrid LDH materials were characterized by the means of conventional techniques as X-ray diffraction and thermal analysis to address their san...
Article
The aim of this work is to elucidate the reinforcing potential of enzymatically treated curaua fibers in biodegradable poly(butylene succinate) (PBS)-based composites. The effect of two different enzymes, i.e. cellulase and pectinase, was evaluated. Untreated and enzymatically treated curaua fibers were characterized in terms of thermal stability (...
Article
Bio-based polyamide 11 (PA11)-graphene nanocomposites with different filler concentrations (0.25, 0.5, 0.75, 1.5 and 3 wt%) were prepared by In Situ polymerization starting from a water dispersed suspension of graphene nanoplatelets. The effects of the incorporation of the filler were studied in terms of molecular, morphological, thermal and dynami...
Article
PA6 is widely used for packaging and engineering applications. Literature reports that organically modified nanoclays can improve its flame resistance, thermo-mechanical and gas barrier properties. This study aims at showing a new approach to effectively disperse an unmodified nanoclay (MMT) in PA6 by melt compounding polymeric matrix and clay in t...
Article
New fully biobased polyether/esters have been synthesized by a one-pot polymerization reaction of ricinoleic acid (RA), vanillic acid (VA) and ethylene carbonate (EC). In particular, EC selectively reacts with the phenolic group of VA to obtain in-situ 4-(2-hydroxyethoxy)-3-methoxybenzoate (EV), suitable for subsequent copolymerization with RA. The...
Article
Nanocomposites based on poly(butylene succinate) (PBS) and hydrotalcite-type anionic clays (HTs) organo-modified with biomolecules characterized by antibacterial and/or antioxidant activity, such as L-ascorbic acid (ASA), phloretic acid (HPP), L-tyrosine (TYR) and L-tryptophan (TRP), have been prepared by in situ polymerization. From XRD analysis a...
Article
Poly(cyclohexane-1,4-dimethylene cyclohexane-1,4-dicarboxylate) has been prepared by solid-state polymerization using 1,4-cyclohexanedicarboxylic acid or its di-methylester and 1,4-cyclohexanedimethanol as monomers. The process consists in a first step in which a prepolymer with high crystallinity is prepared by melt polycondensation and then submi...
Article
Rice endosperm, an industrial by-product containing starch as the main component, has been used for the production of novel biocomposites, based on poly(butylene succinate) (PBS). The composites were prepared by melt-mixing, using original or enzymatically-treated rice endosperm. This enzymatic treatment enables the extraction of some high value mo...
Article
3-(4-hydroxyphenyl)propionic acid (HPPA), a biobased hydroxy acid, has been used as organic modifier in Layered double hydroxides (LDHs) based on ZnAl and MgAl cations. PBS bionanocomposites have been prepared via in situ polymerization (with both types of clays) and melt blending (just with ZnAl-HPPA) obtaining completely green materials, potentia...
Article
Full-text available
Nanocomposites of bisphenol A polycarbonate with organically modified clays have been prepared for the first time by in-situ polymerization using bis(methyl salicyl) carbonate as activated carbonate. The use of the activated carbonate permits to conduct the polymerization reaction at lower temperature and with shorter polymerization time with respe...
Article
In this paper, the reversible crystal-crystal transitions of poly(hexamethylene dithiocarbonate) (PHMDC) has been systematically studied. According to various experimental results, we confirm that the transition shares the common features with Brill transition that is widely observed in nylons. This transition is clearly associated with the reversi...
Patent
The invention relates to layered double hydroxides organo-modified by 3-(4-hydroxyphenyl)propionic acid (HPPA), by 2-(4-hydroxyphenyl)ethylsulfonic acid or by a hydroxyphenylpropenoic acid, and to composite polymer materials comprising same. The composite materials are advantageously made of biosourced polymers such as poly(butylene succinate). The...
Article
A new and sustainable pathway for the synthesis of polyesters and copolyesters derived from vanillic acid is suggested. The poor reactivity of the fenolic -OH group of vanillic acid has been overcome by etherification reactions with biobased ethylene carbonate: the full procedure towards poly(ethylene vanillate) (PEV) avoids solvents and purificati...
Conference Paper
The Diels–Alder reaction between furan and maleimide moieties is a well-known and widely used strategy to build bio-based macromolecular structures with peculiar properties. The furan-maleimide adducts are thermally reversible because they can be broken above about 120°C and recombined at lower temperatures. At the moment only the monomers exhibiti...
Article
A new synthetic pathway for the production of p-toluic acid has been developed starting from reagents derived from renewable resources. A Diels-Alder reaction between sorbic and acrylic acids is followed by a combined dehydrogenation/ decarboxylation process, providing p-toluic acid in high yields. This route permits to use milder conditions compar...
Article
New processes for the chemical recycling of bisphenol A polycarbonate (PC), directly from post-consumer compact discs, have been developed. The first recycling method is based on the use of molecules that can be derived from renewable resources (isosorbide, ethylene carbonate and succinic acid). A second procedure involves a one-pot reaction of pos...
Article
EVOH32 is a semicrystalline copolymer with high barrier performances and therefore suitable for packaging applications. In order to improve its processability through a decrement of its crystallization temperature from the molten state, EVOH32 was mixed with a wide range of low-molecular-weight additives. The strategy is based on the possibility th...
Article
The retting process, carried out with warm inoculated water, has been evaluated as a potential method to modify the structure of fibers in order to prepare polymeric biocomposites. The efficiency of the method was tested by analyzing the final performances of the produced composites, prepared with reinforcing hemp fibers (Cannabis sativa L.) disper...
Chapter
Molecules that can be recovered from natural feedstocks constitute a very important source for the preparation of polymers. For this reason, in this chapter, we report the use of terpenes, rosins, sugars, and vegetable oils, all derived from renewable resources, for the direct preparation of polymers. The use of biomass-derived monomers has been ex...
Chapter
In recent years notable improvements have been developed in biomass conversion toward a better exploitation of natural resources and biowastes to provide building blocks for green polymers. This chapter aims at collecting the most recent developments in the use of the most significant biomolecules (furans, diacids, diols, hydroxyacids, glycerol) to...
Article
The aliphatic counterparts of the most used aromatic polyesters (PET, PPT, and PBT) have been synthesized by a two-stage polycondensation process, starting from dimethyl 1,4-cyclohexane dicarboxylate and different diols. The fully aliphatic polyesters are characterized by two cis/trans isomeric ratios (50 and 90 mol%) of the 1,4-cycloaliphatic ring...
Article
Given the increasing relevance of poly(butylene succinate) (PBS) and poly(L-lactide) (PLLA) as bio-based thermoplastics, and the need to improve the properties of such polymers, a novel multicomponent reinforcing system was devised. Nanofibrous electrospun mats of PLLA containing graphene were incorporated into the PBS matrix via the conventional t...
Article
The knowledge of the photodegradation mechanisms and the possibility to modify them is a very important topic, especially for the novel biopolymers, as their durability with respect to the petro-plastics is yet an open question. Among the biopolymers, aliphatic polyesters are an emerging class of materials, thanks to the possibility of preparing th...
Article
Bionanocomposites based on poly(butylene succinate) and a novel organo-modified layered double hydroxide have been prepared by in situ polymerization. In order to enhance the compatibilization of the inorganic filler with the polymer matrix, an oligomer of PBS was intercalated between the layers of the clay. Composites with different percentages of...
Chapter
Graft copolymerization is an attractive method for surface functionalization of natural polymers and can be initiated by chemical methods, radiation technique, and other systems. Polymer grafting onto polysaccharides is an effective method for the synthesis of superabsorbents. Depending upon the type of monomers and the conditions employed the prop...
Article
Potentially bio-based aromatic polyesters with a kinked structure based on resorcinol have been successfully prepared. The process involves an optimized reaction between resorcinol and ethylene carbonate: the diol thus obtained was polymerized with several aliphatic and aromatic dicarboxylic acids. The chemical structure and the thermal properties...
Article
Biocomposites based on poly(butylene succinate) (PBS) and curaua fibers have been produced by compression molding, and investigated as a function of fiber length and amount. Mechanical tests, water uptake and morphology studies were carried out in order to assess the composite features according to the characteristics of the reinforcing agents. It...
Article
High molecular weight, amorphous poly(propylene 2,5-furandicarboxylate) has been aged at 135 °C for different times. The crystal phase contributes to achieve exceptionally low oxygen transmission rates and also good impermeability to water vapors, making PPF one of the most interesting fully biobased polyesters for packaging applications.
Article
A sodium montmorillonite, Dellite HPS, was modified with ionic liquids based on phosphonium salts, such as octadecyltriphenylphosphonium tetrafluoroborate and octadecyltriphenylphosphonium bromide. Thanks to their high thermal stability, these salts can be used during in situ polymerization, a method that favors the achievement of a good dispersion...
Article
Full-text available
Novel bio-based and biodegradable electrospun membranes, containing bactericidal ricinoleic acid (RA) units either by copolymerization with butylene succinate (BS) units or by blending PRA and PBS homopolymers, are characterized in their chemical, thermal, mechanical and surface properties. In the blends E. coli and S. aureus mortality rate increas...
Article
Powder coatings have been prepared using a sustainable polyester synthesized by combining the chemical recycling of polymers, recovered from post-consumer waste streams, with the use of bio-based monomers. The coatings obtained using this environmentally friendly approach have been compared with those based on a traditional polyester synthesized us...
Article
To solve problems of stiffness of EVOH in film preparation, new formulations are investigated. First, dipentaerythritol (DPE) is blended with EVOH: it acts as plasticizer, decreases the EVOH crystallization temperature and allows the preparation of articles featuring enhanced flexibility and stretchability. However, beyond a certain loading (above...
Article
A new one-pot method for the melt synthesis of polyarylates based on resorcinol and phthalic acids has been developed. The method consists in the reaction of diphenyl carbonate, phthalic acids and resorcinol using titanium butoxide as catalyst. Model reactions have shown that the diaryl ester is generated in situ by reaction of the aromatic diacid...
Article
A series of layered double hydroxides interleaved with surfactant using saturated alkyl chain carboxylate anions CH3(CH2)(m)COOH, even number m between 6 (C8) and 16 (C18), obtained by coprecipitation method was dispersed by melt polymer extrusion into polypropylene (PP), poly(butylene)succinate (PBS) and polydimethylsiloxane (PDMS). The hybrid LDH...
Article
A series of poly(1,4-cyclohexylenedimethylene 1,4-cyclohexanedicarboxylate) (PCCD) samples, characterized by different cis/trans ratio of the 1,4-cyclohexanedicarbonyl units, and a PCCD ionomer, containing 3 mol% of ionic terminal groups, were exposed to accelerated UV in order to study the molecular modifications occurring during the ageing period...
Article
Copolymerization of poly(m-xylylene adipamide) (MXD6) and poly(hexamethylene isophthalamide-co-terephthalamide) (PA6I-6T) was used as an efficient strategy to prepare amorphous homogeneous systems with improved properties mainly for packaging applications. The preparation of block copolymers was first of all tried by co-extrusion of the two polymer...
Chapter
Full-text available
Organic-inorganic hybrid nanofibers obtained by electrospinning technology have experienced a growing interest in the last decade thanks to the versatility and the high productivity of the technique, compared to other technologies devoted to the fabrication of nanocomposites, and to the unique and numerous features displayed by the produced nanomat...
Article
This work aims at preparing new castor oil-derived polyesters with antibacterial activity. Ricinoleic acid and 10-undecenoic acid, derived from castor oil, were successfully used for this purpose. Firstly, an unsaturated homopolymer, derived from the self-polycondensation of ricinoleic acid, and its copolymers with poly(butylene succinate) were syn...