Angel Marcos-Fernández

Angel Marcos-Fernández
Spanish National Research Council | CSIC · Instituto de Ciencia y Tecnología de Polímeros

PhD

About

160
Publications
49,094
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
2,427
Citations
Additional affiliations
September 1994 - present
Spanish National Research Council
Position
  • Polyurethanes; Gas separation membranes
January 1993 - December 1994
University of Manchester Institute of Science and Technology
Position
  • Cyanate esters
Education
January 1989 - December 1992
October 1983 - June 1988

Publications

Publications (160)
Article
Full-text available
Thermoplastic polyurethanes (TPUs) are versatile polymers presenting a broad range of properties as a result of their countless combination of raw materials—in essence, isocyanates, polyols, and chain extenders. This study highlights the effect of two different chain extenders and their combination on the structure–property relationships of TPUs sy...
Article
The circular economy is a path that society, governments, and business must adopt to develop a viable and sustainable model for plastic production. Following the route guided by the United Nations and the new laws of the European Union, such as the Green Deal, it will be able to put an end to the great problem of this era, the inadequate treatment...
Article
Full-text available
A series of non-toxic biodegradable and biocompatible polyurethanes bearing p-aminobenzoate moieties are presented. The introduction of this attractive motif was carried out by the synthesis of a novel isocyanate. These biodegradable polymers were chemically and physically characterized by several techniques and methods including bioassay and water...
Article
Currently, chemical recycling is presented as a viable and feasible solution for the treatment and management of plastic bottle waste, based on a Circular Economy model instead of a linear production model. The objective of this work was the chemical recycling of PET to obtain polyols under mild reaction conditions and looking for a high versatilit...
Article
Novel crosslinked polyesters were designed to obtain hydrogels friendly with the environment and able to display potential biologic applications. Through polycondensation reactions, the synthesis used polyethylene glycols (PEGs) of different molecular weights and a silylated fatty methyl ester obtained from methyl 10-undecenoate, a derivative of ca...
Article
According to the Sustainable Development Goals, a Circular Economy system must be implemented in the production of plastic materials. To this end, new ways of Chemical Recycling plastic residues, such as PET, have been proposed, with the aim of obtaining high value-added products like polyurethanes, polyesters and poly(ester amide)s, and thus solve...
Article
The study of thermal properties of frozen salt solutions representative of ice layers in Jovian moons is crucial to support the JUpiter ICy moons Explorer (JUICE) (ESA) and Europa Clipper (NASA) missions, which will be launched in the upcoming years to make detailed observations of the giant gaseous planet Jupiter and three of its largest moons (Ga...
Preprint
Full-text available
The study of thermal properties of frozen salt solutions representative of ice layers in Jovian moons is crucial to support the JUpiter ICy moons Explorer (JUICE) (ESA) and Europa Clipper (NASA) missions, which will be launched in the upcoming years to make detailed observations of the giant gaseous planet Jupiter and three of its largest moons (Ga...
Article
Full-text available
Additive manufacturing (AM) is a disruptive technology that enables one to manufacture complex structures reducing both time and manufacturing cost. Among the materials commonly used for AM, thermoplastic elastomers (TPE) are of high interest due to their energy absorption capacity, energy efficiency, cushion factor or damping capacity. Previous in...
Article
Chemical modification of banana starch (Musa paradisiaca L.) with the degradation products of virgin and bottle waste of polyethylene terephthalate was carried out in situ. The modified starch was characterized by FTIR and NMR, which allowed proposing three chemical structures. SEM micrographs showed that the morphology of the modified starch granu...
Article
Terpenes with olefin methyl branches and bifunctional hydroxyl groups were used as initiators in the ring-opening polymerization of ε-caprolactone (CL) catalyzed by ammonium decamolybdate (NH4)6[Mo7O24], resulting in α-hydroxyl-ω-olefin poly(ε-caprolactone) (PCL) (Co–PCL–OH). The degree of polymerization was kept low (5 and 10) in all the species t...
Article
Full-text available
The synthesis of poly(urethane-urea) (PUUs) bearing deactivated diamines within the backbone polymer chain is presented. Several deactivated diamines present interesting properties for several applications in the biomaterial field due to their attractive biocompatibility. Through an activation with Chloro-(trimethyl)silane (Cl-TMS) during the polym...
Article
The synthesis of linear and crosslinked polyurethanes based on α,ω-dihydroxypolydiethylene glycol terephthalate (PDET) is described. Prior to the preparation of these materials, a PDET polymer was obtained by conventional condensation reaction between dimethyl terephthalate and diethylene glycol, and a well-characterized fraction of PDET with numbe...
Article
Full-text available
En los últimos años, los recubrimientos autorreparables han sido objeto de un interés creciente en el sector de la automoción de-bido fundamentalmente a su capacidad para incrementar la durabilidad y el mantenimien-to del acabado estético; la autorrecuperación de sus propiedades iniciales debido al daño local causado por factores externos es uno de...
Article
Full-text available
In the present work, the synthesis of segmented polyurethanes functionalized with catechol moieties within the hard or the soft segment is presented. For this purpose, a synthetic route of a new catechol diol was designed. The direct insertion of this catechol-free derivative into the rigid phase led to segmented polyurethanes with low performance...
Article
Banana starch was modified with B bis(2-hydroxyethyl) terephthalate and its instrumental characterization allowed to propose a chemical structure. In the carbon 6 (C6) of the starch the modification reaction was carried out. The morphology of starch changes due to its chemical modification. The modified starch showed a lower crystallinity and therm...
Article
Full-text available
An attractive strategy involving photodimerization of a novel amidocoumarin moiety is presented to prepare polyurethane coatings with excellent mechanical properties. Two families of polyurethanes containing these chromophore units into soft or hard segments were easily synthesized by inserting a small fraction of amidocoumarin-diol (5 wt% or 10 wt...
Article
Full-text available
Coumarin derivatives are a class of compounds with a pronounced wide range of applications, especially in biological activities, in the medicine, pharmacology, cosmetics, coatings and food industry. Their potential applications are highly dependent on the nature of the substituents attached to their nucleus. These substituents modulate their photoc...
Article
A versatile synthetic approach for the easy preparation, under smooth reaction conditions, of diverse classes of linear polymers bearing aliphatic or aromatic isocyanate groups in the side chains is described. The procedure consists in the transformation of primary amine groups present in the polymer into isocyanates using equimolar amounts of diph...
Article
Three series of poly(ethylene-co-vinyl acetate)/mesoporous silica type SBA-15 (EVA/SBA-15) nanocomposites, containing 1, 2, 3, and 4 wt% SBA-15 nanoparticles were prepared by melt blending in internal mixer. The mesoporous silica SBA-15 was synthesized by the sol-gel method and organomodified by Hexadecyltrimethoxysilane (HDTMS). The terpolymer of...
Article
Polyurethanes (PUs) based on poly(tetramethylene oxide) (PTMO) used in the biomedical sector can be exposed to ionizing radiation in vivo as implants during diagnosis (X-ray) or during radiotherapy treatment (gamma), or ex vivo for sterilization purposes (gamma, electron beam). This ionizing radiation can, at certain levels, cause degradation of th...
Article
Full-text available
Polyurethanes are of undoubted interest for the scientific community and the industry. Their outstanding versatility from tailor-made structures turns them into major polymers for use in a wide range of different applications. As with other polymers, new, emerging molecules and monomers with specific attributes can provide new functions and capabil...
Conference Paper
Full-text available
Resumo: A microdiscectomia utilizada para o tratamento de distúrbios do disco intervertebral (DIV) deixa uma incisão aberta no anel fibroso (AF), que deve ser selada para evitar a re-herniação e outras degenerações subsequentes. Neste estudo, é proposto o desenvolvimento de um adesivo de poliuretano (PU), injetável e polimerizável in situ, como uma...
Article
Poly(caprolactone) (PCL) was synthesized from the polymerization of ε-caprolactone (CL) with degraded poly(ethylene terephthalate) (PET) for its functionalization using heptamolybdate of ammonium and tin(II) 2-ethylhexanoate, as catalyst and initiator, respectively. Polymerization of CL with bis(2-hydroxyethyl) terephthalate (BHET) was carried out...
Article
The microdiscectomy used for the treatment of intervertebral disc disorders leaves an open incision in the annulus fibrosus that must be sealed to avoid re-herniation and other subsequent degenerations. In this study, we developed an injectable and in situ polymerizable polyurethane adhesive as a long-term post-surgical annulus fibrosus repair stra...
Article
Full-text available
La fabricación aditiva (AM de Additive Manufacturing), tambien conocida generalmente como impresión 3D, permite la fabricación de objetos totalmente personalizados con un alto nivel de complejidad geométrica y con una importante reducción del tiempo y del coste de fabricación. Entre los materiales utilizados para la AM, además de los metales y la c...
Article
α,ω-Hydroxy telechelic poly(ε-caprolactone) (HOPCLOH) was synthesized by ring-opening polymerization (ROP) of ε-caprolactone (ε-CL).The ROP was catalyzed by ammonium decamolybdate in the presence of ether diols [HO-(CH2-CH2-O)m-H] (where m = 2, 3, 4, 5, 6, and 8) as initiators. The homopolymer HOPCLOH was obtained with the ether group (EG) [HO-PCL-...
Article
Ether group (E) diols [HO(CH2CH2O)xH, x = 2, 3, 4, 5, 6, and 8] and polyethylene glycol (PEG) [HO(CH2CH2O)xOH] were used as initiators in the ring-opening polymerization (ROP) of ε-caprolactone (CL) catalyzed by ammonium decamolybdate to synthesize the poly(ε-caprolactone) (PCL) macrodiols such as HOPCL–E–PCLOH and HOPCL–PEG–PCLOH, respectively. Th...
Article
Full-text available
Two series of segmented polyurethanes were obtained and their mechanical and thermal properties as well as their biodegradability and cytotoxicity were evaluated. The chemical nature of the polyurethanes was varied by using either 1,4 butanediol (poly-ester-urethanes, PEUs) or L-lysine ethyl ester dihydrochloride (poly-ester-urea-urethanes, PEUUs)...
Article
Full-text available
Polymers used in the biomedical sector can be exposed to ionizing radiation (X-ray, gamma) in vivo as implants or ex vivo for sterilization purposes (gamma, electron beam). This ionizing radiation can, at certain levels, cause degradation of the polymer. Polycaprolactones (PCL) of different molecular weights were irradiated with electron beam and t...
Article
Herein, a new approach to achieve gas separation materials with improved resistance to plasticization (obtained by partial pyrolysis of new polyimide blends) is presented. Blends of an aromatic polyimide (formally, 6FDA-6FpDA) and aliphatic-aromatic copolyetherimides based on the same polyimide in combination with other aliphatic polyimides, having...
Article
Two series of aromatic poly(ortho-hydroxyamide)s (poly(o-hydroxyamide)s, HPAs) were prepared by reaction of two diamines, 2,2-bis(3-amino-4-hydroxyphenyl) propane (APA) and 2,2-bis(3-amino-4-hydroxyphenyl) hexafluoropropane (APAF), with four aromatic diacid chlorides; terephthaloyl dichloride (TPC), isophthaloyl dichloride (IPC), 2,2-bis[4-chloroca...
Article
Nanostructured polyurethanes have attracted substantial interest for the generation of “smart” surfaces, but step-growth polymerization at the nanoscale has scarcely been reported. In this work, the synthesis of polyurethanes by step-growth polymerization in the nanocavities of anodized aluminum oxide (AAO) templates is studied, finding that the ki...
Article
Full-text available
Polymeric materials are essential elements in our lives. In this sense, the design and rational development of sustainable polymeric materials is nowadays one of the main challenges in our society. In the last years, new ways have been explored to contribute to solve the scientific and technological challenge postured by the most efficient use of p...
Article
Full-text available
Los recubrimientos autorreparables están despertando un gran interés en el sector de automoción, en parte gracias a la capacidad de estos materiales a aumentar el ciclo de vida de los productos a través de una recu-peración de las prestaciones iniciales. Para ello se combinan la versatilidad y prestacio-nes de los poliuretanos con el desarrollo de...
Article
Full-text available
α,ω-Hydroxy telechelic poly(L-lactides) (HOPLLAOH) were synthesized by ring-opening polymerization of the L-lactide (L-LA) catalyzed by tin octoate [Sn(Oct)2] in the presence of two different types of initiators such as alkyl diols [HO−(CH2−CH2)m−OH] and ether diols [HO−(CH2−CH2−O)m−H] (where m = 2, 3, 4, 5, 6, and 8), and eventually, two different...
Article
The degradation of poly(ethylene terephthalate) by ethylene carbonate with potassium hydroxide was studied. Model reactions were carried out to determine the chemical species produced. Ethylene carbonate reacted with potassium hydroxide to yield oligomers with a limited content of carbonate groups. Bis(2-hydroxyethyl) terephthalate condensed to PET...
Article
Full-text available
α,ω-Hydroxy telechelic poly(ε-caprolactone)s (HOPCLOHs) were prepared by ring-opening polymerization (ROP) of the ε-caprolactone (CL) catalyst by ammonium decamolybdate (NH4)8[Mo10O34] in the presence of different aliphatic diols [HO-(CH2)m-OH, where m = 2,4,6,7,8,10,12,14,16] as initiators to obtain a family of HOPCLOH [HO-PCL-O-(CH2)m-O-PCL-OH, m...
Article
Linear segmented polyurethanes with 10% weight of coumarin groups within the soft segment, the hard segment or equally distributed between both segments were successfully prepared. These polyurethanes, based on polycaprolactones, isophorone diisocyanate, butanediol and a dihydroxylated coumarin monomer, were completely amorphous and homogeneous wit...
Article
Full-text available
Bioresorbable linear poly(ether-ester-urethane)s with different hydrophilic characteristics were synthesized from triblock copolymers of poly(ε-caprolactone)-poly(ethylene oxide)-poly(ε-caprolactone) (PCL-PEO) as macrodiols, and L-lysine diisocyanate (LDI) or hexamethylenediisocyanate (HDI) were used as the required diisocyanates. Macrodiols were o...
Article
Shape-memory elastomers based on a commercial rubber cross-linked by both ionic and covalent bonds have been developed. The elastomeric matrix was a carboxylated nitrile rubber (XNBR) vulcanized with magnesium oxide (MgO) providing ionic interactions that form hierarchical structures. The so-named ionic transition is used as the unique thermal tran...
Article
Polyethylene oxide (PEO)-based polymers containing long PEO chains are one of the best materials for postcombustion processes, attending to their separation properties. Optimal conditions for the application of the membrane separation module are immediately after elimination of water vapor, NO x , SO2, and dust particles, where the temperature of t...
Article
The electron beam irradiation of a biaxially oriented PET film was carried out in air over a range of 50–3000 kGy at different temperatures and a dose rate of 4.48 kGy min−1. The effects of the irradiation at temperatures above and below the glass transition temperature (Tg) on the thermal and mechanical properties were studied. Melting temperature...
Article
A series of α, ω-hydroxy telechelic poly(L-lactide)s (HOPLLAOHs) were synthesized by ring-opening polymerization (ROP) of L-lactide (L-LA) using tin octoate [Sn(Oct)2] as catalyst and a family of linear alkyl diols as initiators (HO-(CH2)m-OH), where m = 2,4,6,8,10 and 12). A systematic analysis of these HOPLLAOHs species in terms of their thermal...
Article
A new coumarin diol was designed and used as initiator for the ring opening polymerization of ε-caprolactone. A photo-reactive polyurethane based on the resulting polycaprolactone diol with pendant coumarin moieties was synthesized. Photo-dimerization/photocleavage reactions were studied by UV and Raman. The linear non-irradiated soft polyurethane...
Article
Full-text available
A series of coumarin-containing branched polyurethanes based on polycaprolactones, hexamethylene diiso- cyanate and a monohydroxylated coumarin monomer with 5 and 10% content by weight of coumarin units were success- fully prepared. Chain architecture was controlled by combination of polycaprolactone (PCL) triol or tetrol with PCL diol. Terminal co...
Article
The present study aimed to investigate the effect of structure (design and porosity) on the matrix stiffness and osteogenic activity of stem cells cultured on poly(ester-urethane) (PEU) scaffolds. Different three-dimensional (3D) forms of scaffold were prepared from lysine-based PEU using traditional salt-leaching and advanced bioplotting technique...
Article
Full-text available
La polimerización enzimática representa hoy en día un enfoque potente y versátil para la síntesis y la funcionalización de polímeros y bio-polímeros. Puede prevenir la generación de residuos mediante el uso de procesos catalíticos con alta selectividad, así como prevenir o limitar el uso de reactivos orgánicos peligrosos. De aquí la importancia de...
Article
Full-text available
The biodegradable aliphatic oligoesters polyglycolide (PGA), poly(L-lactide) (PLLA), and poly(-caprolactone) (PCL) with similar number-average molecular weight M n values but different linear alkyl end groups [CH3−[CH2−CH2]m−CH2−] were compared in terms of their physical properties, parameters such as melting temperature (T m), crystallinity (x i),...
Chapter
Oligomeric polycaprolactone diol (DEG1) was synthesized using biocatalysis with immobilized Yarrowia lipolytica lipase (YLL) and diethyleneglycol as initiator. A series of linear poly ester-urethanes were prepared from synthesized PCL diol, hexamethylenediisocyanate (HDI) and (i) L-lysine ethyl ester dihydrochloride, (ii) L-cysteine hydrochloride,...
Article
Three emitting copolyfluorenes, based on 2,7-(9,9-dihexyl)fluorene and different aryl groups (1,4-bencene, PFH-B; 1,4-bencen-1,2,5-thiadiazole PFH-BT; 1,4-naphthalen-1,2,5-thiadiazole, PFH-NT), showing diverse acceptor character, in different proportions were blended with a polyimide 6FDA-6FpDA to make a series of films. These copolyfluorene-polyim...
Patent
The present invention relates to a thermoplastic polyurethane composition comprising segments derived from a polyether carbonate polyol, wherein said polyether carbonate polyol is obtainable by a process comprising copolymerizing one or more H-functional initiator substances, one or more alkylene oxides and carbon dioxide in the presence of a doubl...
Article
In our previous works, it was observed a clear relationship between the structure and the properties for different copoly(ether-imide)s, besides a good relation was found between SAXS characterization and permeability results. Here, a series of aliphatic aromatic copoly(ether-imide)s, based on an aromatic diamine (ODA), a diamine terminated poly(et...
Article
This paper aims to increase the knowledge on the crystallinity features of diblock copolymers based on poly(∊-caprolactone) (PCL) and poly(L-lactic acid) (PLLA). Six diblock copolymers have been synthesized starting from a synthesized PCL with a molecular weight of around 5000 g mol −1 , varying the molecular weight of the PLLA block. The crystalli...
Article
This article describes the preparation of porous poly (ɛ-caprolactone), PCL, membranes by supercritical CO2 (SCCO2) foaming, displaying surface hierarchical macroporosity which could be tailored by careful control of the pressure, in the range of 150-250 bar, and depressurization processes in several steps, showing also pore interconnectivity betwe...
Article
Poly(o-acyloxyamide)s (PORAs) derived from a poly(o-hydroxyamide) from 2,2′-bis(3-amino-4-hydroxyphenyl)- hexafluoropropane (APAF) diamine, APAF−POHA, have been synthesized and evaluated as gas separation materials. PORAs were synthesized from poly(o-hydroxyamide)s by derivatization of the free OH group with an aliphatic acid dichloride or dianhydr...
Article
Full-text available
Biomaterials are an important element in tissue engineering, where they are used as an extracellular matrix to achieve regeneration. Elasticity is a major mechanical property in many types of tissues, so great efforts have been made in the development of elastomeric biomaterials to mimic these natural properties. This article provides an overview o...