Umit Tayfun

Umit Tayfun
Bartin University · Department of Engineering

Ph.D.

About

54
Publications
21,376
Reads
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774
Citations
Introduction
My research activities on polymeric composites aim to sustain systematic investigation on mechanical, physical, thermal and morphological properties of composite materials, tuning electrical conductivity of polymers, production of fire-resistive plastics as well as performing proper surface modification methods on reinforcing material for improvement its interfacial adhesion to polymer matrix. The past and ongoing studies about “performing surface modification routes to nano-dimensional materials, high aspect ratio fibers, natural minerals and agricultural waste products” , “compounding several polymers with these surface treated products to level up the basic properties of polymers by enhancement of compatibilty’’ cover broad range of scientific and technological projects.
Additional affiliations
October 2011 - June 2016
Middle East Technical University
Position
  • Researcher
Education
September 2011 - November 2015
Middle East Technical University
Field of study
  • Polymer Science and Technology
October 2003 - October 2006
Middle East Technical University
Field of study
  • Polymer Science and Technology
September 1998 - September 2003
Hacettepe University
Field of study
  • Chemistry

Publications

Publications (54)
Article
Scientific researches have been focused on finding halogen-free solutions as effective as halogenated ones owing to environmental and health problems in recent years. This fact is the main driving force for upcoming academic works in the flame retardancy field. Boron compounds, are high potential flame retardant additive in polymer based materials...
Article
Full-text available
Chopped jute fiber (JF) surfaces were modified using alkaline, silane and eco-grade epoxy resin. Surface characteristics of jute fibers were confirmed by FTIR and EDX analyses. JF filled polyurethane elastomer (TPU) composites were prepared via extrusion process. The effect of surface modifications of JF on mechanical, thermo-mechanical, melt-flow,...
Article
Full-text available
Thermoplastic polyurethane (TPU) composites filled with fullerene in the range from 0.5 wt% to 2 wt% were fabricated using melt-compounding. Fullerene addition levels up to nearly twofold increase in tensile strength, percent elongation, and modulus of TPU. The mechanical properties are improved as modified C60 content decreases. Fullerene loadings...
Article
Full-text available
Thermoplastic polyurethane (TPU) matrix was reinforced with polyhedral oligomeric silsesquioxane (POSS) and halloysite nanotubes (HNT), both separately and combined. Composite samples were fabricated using a melt-compounding method. Characterization of the composites obtained was performed via tensile and hardness tests, melt-flow index measurement...
Article
The fire retardant performance of carbon fiber (CF) reinforced polyamide 6 (PA 6) composites plays an important role in their novel application fields. Thus, expandable graphite (EG) is integrated into CF containing PA 6 composite system to donate halogen-free flame retardant property based upon intumescence. The effect of EG amount on the thermal,...
Chapter
Coconut fibers are high potential reinforcing additive in green polymer composites due to its composition, structure and the ease of availability. Modifications of coconut fiber by chemical and physical methods play key role to achieve desired performance. This review provides a comprehensive description of the influence of varied treatment routes...
Article
Full-text available
Acrylonitrile–butadiene–styrene (ABS) terpolymer was compounded with short carbon fiber (CF) and carbon nanotube (CNT) using a micro-extruder followed by the injection molding process. Composite samples were fabricated with loading ratios of 20 wt.% CF and 0.1, 0.5 and 1.0 wt.% of CNT. Mechanical, electrical, thermo-mechanical, thermal, melt-flow,...
Article
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Mussel shell is one of the most hazardous aquaculture wastes and its powder was used as an additive for bio-degradable poly (lactic acid) in this current study. Bio-composites were fabricated via conventional melt mixing technique followed by an injection moulding process. The effects of mussel shell powder inclusion on mechanical, melt-flow, water...
Chapter
Fullerene reinforced polymeric composites have found numerous applications in varied fields including conductive films, photovoltaics, strain sensors, electromagnetic shielding and shape-memory materials. Most of these characteristics are achieved by thermoplastic polymers since thermoplastics have advantageous points such as ease of processing, di...
Article
Full-text available
Polyamide 6 (PA) matrix was reinforced with Na-activated bentonite, amino functional silane treated bentonite and organo-modified clays at different concentrations. The preparation of composites was carried out using melt-blending method and the test samples were prepared by injection-molding process. Mechanical, thermal, structural and processing...
Article
Full-text available
Olive pulp, which is formed 80% in the olive oil extraction process, attracts the attention of researchers with the zero waste project in Turkey. Our study aims to prove that olive pulp is not only a waste and can be used as a resource when used correctly as a filler in composite materials to provide not only durable but also shorter biodegradation...
Article
In the present paper the effect of the diatomite, also known as diatomaceous earth and kiesel guhr (KG), content on mechanical, thermo-mechanical, melt-flow and thermal performance of thermoplastic polyurethane-based composites was investigated. Composites were fabricated by melt blending method with 10, 20, 30 and 40% filling ratios of KG. and inj...
Article
In this study, changes in the properties of neat, carbon and glass fiber reinforced polycarbonate via high dose rate gamma irradiation were investigated. Irradiations were carried out at dose rate of 737 Gy/h. Specimens were irradiated up to four different doses which were 10, 25, 50, 75 kGy. Total irradiation doses, irradiation dose, type and cont...
Article
Full-text available
Barite mineral (BRT) was compounded with acrylonitrile butadiene styrene terpolymer (ABS) with four varied filling ratio of 5%, 10%, 15% and 20% by weight. ABS/BRT composites and unfilled ABS were fabricated by twin screw micro-extruder and test samples were shaped using injection molding process. Tensile tests, shore hardness measurements and impa...
Article
Acrylonitrile-butadiene-styrene (ABS) terpolymer was loaded with expandable graphite (EG) at four different concentrations of 5%, 10%, 15% and 20% using micro-compounder followed by injection molding process. Mechanical, thermomechanical, thermal, flame retardancy, melt flow and morphological characterizations of composites were done by tensile, ha...
Article
Full-text available
In this study, we present the influence of sizing layer of short carbon fiber (CF) to the basic properties of CF reinforced acrylonitrile–butadiene–styrene (ABS) composites. Composite samples are prepared with four different loading ratio of 5, 10, 15 and 20% by weight using melt-compounding. Surface topography, elemental analysis and surface funct...
Article
Diatomite (KG) surface was modified by four different silane coupling agents having amino, epoxy, triamine and octyl functional groups for enhancement of interfacial adhesion between thermoplastic polyurethane (TPU) and diatomite. EDX and FTIR spectroscopy techniques were used to evaluate the surface functionalities of modified and neat KG samples....
Article
Purpose This study aims to investigate the mechanical, thermal, melt-flow and morphological behavior of acrylonitrile-butadiene-styrene (ABS)-based composites after bentonite inclusions. Melt mixing is the most preferred production method in industrial scale and basically it has very near processing parameters compared to 3D printing applications....
Article
In this study, two kinds of mineral fillers, bentonite (BNT) and barite (BRT), were incorporated into low density polyethylene (LDPE) by extrusion process. Silane treatment was applied to BRT and BNT surfaces in order to increase their compatibility with LDPE matrix. Surface characteristics of fillers were examined by Fourier transformed infrared s...
Article
Full-text available
Glass fiber (GF) and mica (MC) filled polycarbonate (PC) composites were fabricated using extrusion process due to considerable applications of PC as recyclable and thermo-stable material in mainly medical, packaging and transportation fields. Tensile, hardness and impact tests, differential scanning calorimetry (DSC) and thermal gravimetric analys...
Article
In this study, eco-grade thermoplastic polyurethane (TPU), which includes 46% renewable content, was reinforced with date palm seed (DPS). Alkali and silane surface treatments were applied to DPS to increase the compatibility between DPS and TPU matrix. The oil of DPS was removed before treatments and surface functionalities of modified and pristin...
Article
Full-text available
Acrylonitrile-butadiene-styrene (ABS) copolymer was filled with perlite mineral (PER) at four different loading level of 2.5%, 5%, 10% and 15%. ABS/PER composites were produced using lab-scale micro-compounder followed by injection molding process. Mechanical, thermo-mechanical, melt-flow and morphological properties of composites were reported by...
Article
Full-text available
Poly (lactic acid) (PLA)-based biocomposites containing flax fiber (FF) and basalt fiber (BF) both separately and together were prepared by melt blending method at the total constant ratio of 30 wt%. Mechanical properties, thermo-mechanical characteristics, thermal stability, flow behaviors, water uptake, and morphology of composites were investiga...
Article
The flame‐retardant behavior of calcium hypophosphite (CaHP) was investigated in different thermoplastic polymers including polyamide 6 (PA), poly (lactic acid) (PLA), thermoplastic polyurethane (TPU), and poly methyl metacrylate (PMMA). CaHP was used at three different amounts of 10, 20, and 30 wt%. The characterization of the composites was perfo...
Article
Full-text available
Alkaline and silane treatments were applied to wood flour (WF) to enrich its adhesion to bio-based thermoplastic polyurethane (TPU) matrix. TPU/WF eco-composites were prepared at a constant ratio of 30% by the melt blending process. The mechanical, thermo-mechanical, melt-flow, water uptake and morphological properties of the materials were investi...
Article
In the current study, the effects of four different POSS nanoparticles on the flame retardant properties of intumescent PP were investigated through mass-loss calorimetry (MLC), limiting oxygen index (LOI) test and UL-94 ratings. In addition, the structure-property relationship was enlightened via thermal, morphological and mechanical tests. The fo...
Article
Acidic pumice (AP) and basic pumice (BP) were compatibilised with the polymer matrix by using silane coupling agents before their addition into polypropylene (PP). In addition, composites with maleic anhydride grafted polypropylene (Ma-g-PP) were prepared. Composites were prepared by melt-blending method using lab-scale twin screw extruder which is...
Article
Full-text available
Thermoplastic polyurethane (TPU) composites containing carbon nanotube (CNT) with the loading ratios from 0.5wt% to 2 wt% were prepared using melt-compounding process. Surfaces of the CNT particles were treated with sulfuric acid/nitric acid to purify CNT and to achieve compatible surface characteristics between TPU matrix and CNT. Mechanical, ther...
Article
Huntite hydromagnesite (HH) is compatibilised with the polypropylene (PP) matrix by using silane coupling agents before addition to polymer. In addition, composites with maleic anhydride grafted polypropylene (Ma-g-PP) matrix were prepared in order to compatible with HH. Composite materials which contain 10% HH content were prepared by using twin s...
Article
Full-text available
Short carbon fibers (CF) with different surface sized (epoxy (EP) and polyurethane (PU)) were used as reinforcing agent in thermoplastic polyurethane (TPU) based composites. Composites containing 5, 10, 15, and 20 weight % sized and desized CFs were prepared by using melt-mixing method. The surface characteristics of CFs were examined by energy dis...
Article
The effects of carbon fiber amount and length were studied on the flame retardant, thermal, and mechanical properties of the intumescent polypropylene composites. The flame retardant properties of the intumescent polypropylene-based composites were investigated using limiting oxygen index, vertical burning test (UL-94), and mass loss calorimeter. T...
Article
The effect of zinc borate (ZnB) was studied on the flame retardant and thermal properties of thermoplastic polyurethane containing huntite-hydromagnesite. The flame retardant properties of thermoplastic polyurethane–based composites were investigated using limiting oxygen index, vertical burning test (UL 94), thermogravimetric analysis, and mass lo...
Article
The effect of microcapsulated red phosphorus (mRP) was studied on the flame retardant, thermal and mechanical properties of thermoplastic polyurethane (TPU) composites containing huntite&hydromagnesite (HH). The flame retardant properties of TPU based composites were investigated using limiting oxygen index (LOI), vertical burning test (UL 94), the...
Article
The effect of expandable graphite (EG) was studied on the flame retardant, thermal and mechanical properties of thermoplastic polyurethane (TPU) containing huntite&hydromagnesite (HH). According to the flammability tests results, the synergistic interaction was observed between HH and EG. The maximum limiting oxygen index (LOI) value was observed a...
Article
Full-text available
Carbon nanotube-reinforced polyurethane elastomer composites were prepared by melt-mixing. Nitric acid oxidation and silanization were applied to carbon nanotube surfaces to achieve better interfacial interactions with polyurethane elastomer. Tensile and hardness tests, differential scanning calorimetry, melt flow index test, dielectric measurement...
Article
Full-text available
The dyeability of poly(lactic acid) (PLA) fiber was tried to be improved with the addition of organoclay during melt spinning process. The tensile, thermal and morphological properties of the fiber samples were characterized by tensile testing, differential scanning calorimeter, X-ray diffraction and transmission electron microscopy, respectively....
Article
In this study, several treatments including alkali, permanganate, peroxide and silanization were applied to flax fiber (FF) to improve its adhesion to bio-based thermoplastic polyurethane (TPU) matrix. TPU/FF composites were prepared at a constant ratio of 30 wt% by using extrusion process. Their mechanical properties, modulus of elasticity, water...
Article
Disperse dye structure affects the dyeability of poly (lactic acid) (PLA) fiber due to the low dyeing temperature and the short dyeing time. Thus, the dye uptake value of PLA fiber is low for some disperse dyes and needs to be improved. In this study, the dyeability of PLA fiber is improved with the addition of synthesized octa (aminophenyl) polyhe...
Article
Full-text available
The aim of this study was to investigate the effect of boron compounds on fire protection properties of intumescent coating based on ammonium polyphosphate (APP). Three kinds of boron compounds namely boric acid (BA), zinc borate (ZB) and melamine borate (MB) were used. Total amount of flame retardant additive was kept constant at 30 wt%, and boron...
Article
In this study, alkali and isocyanate surface modifications were applied to flax fiber (FF) to improve its adhesion to bio-based thermoplastic polyurethane (TPU) matrix. In addition to these treatments, isocyanate treated FF was subjected to curing process. TPU/FF composites were prepared at a constant 30 wt% loading of the total by using melt-blend...
Article
The main aim of this study was the modification of jute fibres with stearic acid using new route called azide method. The surface changes after modification process were characterized by attenuated total reflectance – Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscopy analyses. It was shown th...
Conference Paper
Full-text available
The dyeability of poly(lactic acid) PLA fiber was tried to improve with the addition of nanoclay during melt spinning process. Tensile, thermal and morphological properties of fiber samples were characterized by tensile testing, differential scanning calorimeter (DSC) and X-ray diffraction (XRD), respectively. The effect of disperse dye type, dye b...
Article
Full-text available
Enhancing interfacial interactions between natural filler and polymer matrix by modifying the surface of rice straw results in stronger thermoplastic polyurethane-based eco-composites.
Conference Paper
Full-text available
Carbon fiber (CF) was used as filler for short CF reinforced TPU composites at loading levels of 5, 10, 15, 20 % by using melt blending method. Polymeric methylene di-isocyanate (pMDI) resin was used in order to cover CF surface. The effects of surface modifications on mechanical, flow, and morphological properties of TPU/short CF composites were i...
Article
Thermoplastic polyurethane (TPU) composites with fullerene loadings varying from 0.5 to 2 weight % were prepared by melt-mixing. Nitric acid oxidation and silanization were applied to fullerene surface to improve interfacial interactions with TPU matrix. The influence of surface modifications of fullerene on mechanical, melt flow and electrical pro...
Article
In this study, rice straw (RS) which was one of the major agricultural residues was used as filler in bio-based thermoplastic polyurethane (TPU). Several treatments including hot water, alkali, permanganate, peroxide and silane were applied for modifying the surface of RS. The effects of surface modifications on mechanical, flow, morphological, and...
Conference Paper
Full-text available
Hafif ve ucuz olmasının yanında istenilen mekanik özelliklere sahip olmasından dolayı doğal liflerin polimer kompozitlerde güçlendirici olarak kullanımında son yıllarda artan bir eğilim gözlenmektedir [1]. İstenilen özelliklere sahip eko-kompozitlerin hazırlanmasındaki engel, doğal lif içeriğindeki selülozun yüksek polar yapısı ile polimer matriksl...
Conference Paper
Full-text available
Thermoplastic polyurethane (TPU) nano-composites with fullerene loadings varying from 0.5 to 2 weight % were prepared by melt mixing. Nitric acid oxidation and silanization were applied to fullerene surface to achieve better interfacial interactions with TPU matrix. The influence of acid and silane surface modifications of fullerene on mechanical,...

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Project (1)
Project
development of huntit&hydromagnesite filled polymeric composites having flame resistance properties