Omid Yousefzade
Polytechnic University of Catalonia
Blowing agentMorphology (linguistics)Glass transitionViscosityIsothermal processElectrospinningCopolymerComposite materialNanotechnologyViscoelasticityPolymer blendMaterials scienceRheologyCrystallizationPolymer degradationExtenderThermoplastic polyurethaneCalcium carbonateGraphiteEthylene-vinyl acetateMelt electrospinningPoly l lactic acidDifferential scanning calorimetryChemical engineeringPhase (matter)CrystallinityCarbon nanotubeFiberPolymerNucleationMicrostructureDispersion (chemistry)Nanocomposite
21Publications
9H-index
148Citations
Publications 19
Newest
#2Omid YousefzadeH-Index: 9
Last. Jordi PuiggalíH-Index: 39
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Melt electrospinning has been developed in the last decade as an eco-friendly and solvent-free process to fill the gap between the advantages of solution electrospinning and the need of a cost-effective technique for industrial applications. Although the benefits of using melt electrospinning compared to solution electrospinning are impressive, there are still challenges that should be solved. These mainly concern to the improvement of polymer melt processability with reduction of polymer degrad...
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#1Omid Yousefzade (UPC: Polytechnic University of Catalonia)H-Index: 9
#2Ramaz Katsarava (UGA: University of Georgia)H-Index: 19
Last. Jordi Puiggalí (UPC: Polytechnic University of Catalonia)H-Index: 39
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Tissue engineering approaches appear nowadays highly promising for the regeneration of injured/diseased tissues. Biomimetic scaffolds are continuously been developed to act as structural support for cell growth and proliferation as well as for the delivery of cells able to be differentiated, and also of bioactive molecules like growth factors and even signaling cues. The current research concerns materials employed to develop biological scaffolds with improved features as well as complex prepara...
2 CitationsSource
#1Sofia Valenti (UPC: Polytechnic University of Catalonia)H-Index: 3
#2Omid Yousefzade (UPC: Polytechnic University of Catalonia)H-Index: 9
Last. Roberto Macovez (UPC: Polytechnic University of Catalonia)H-Index: 13
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Abstract Transmission electron microscopy, temperature-modulated differential scanning calorimetry, and broadband dielectric spectroscopy were employed to characterize ternary nanocomposites consisting of carboxylated carbon nanotubes (CNT) dispersed in a blend of two immiscible polymers, poly(L,lactide) (PLLA) and thermoplastic polyurethane (TPU). The nanocomposite blends were obtained by melt-compounding of PLLA and TPU in the presence of 0.2 wt-% CNT, either in the presence or absence of a Jo...
3 CitationsSource
#1Omid Yousefzade (AUT: Amirkabir University of Technology)H-Index: 9
#2Javad Jeddi (UT: University of Tennessee)H-Index: 4
Last. Hamid Garmabi (AUT: Amirkabir University of Technology)H-Index: 21
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Abstract Poly( l -lactide)s (PLLAs) with different chain structures were prepared by reactive melt processing and using Joncryl ADR as chain extender. Results of gel permeation chromatography (GPC) revealed that chain extended PLLAs had high molecular weights and two differentiated molecular weight distributions. Linear rheology was sensitive to the obtained molecular structures and revealed as the increase on the amount of chain extender gradually led to a decrease of the loss factor in the who...
4 CitationsSource
Last. Hamid GarmabiH-Index: 21
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Control of thermal degradation and melt strength of Poly (lactic acid), PLA, during melt processing while improving the toughness of the obtained samples is still a challenge for the polymer industry. Poly (L-lactide acide) (PLLA)/Thermoplastic polyurethane (TPU) blends were prepared in compositions of 70/30% and 50/50% in presence of multifunctional epoxy chain extender. A laboratory internal mixer was used to prepare the samples via reactive melt mixing. The effect of TPU on tensile modulus an...
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#1Omid Yousefzade (AUT: Amirkabir University of Technology)H-Index: 9
#2Jone M. Ugartemendia (UPV/EHU: University of the Basque Country)H-Index: 8
Last. Hamid Garmabi (AUT: Amirkabir University of Technology)H-Index: 21
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In this study, two types of polymeric nanocomposite blends based on poly(l-lactide) (PLLA) and a thermoplastic polyurethane were prepared by reactive and non-reactive melt mixing. Multiwalled carbon nanotubes (MWCNTs) participated in reactive melt mixing and changed in both cases the morphology of blends. Melt rheology was used to study the influence of reactive melt mixing and localization of MWCNTs in terms of melt viscoelastic properties and relaxation time spectrum. Two relaxation times were...
8 CitationsSource
#1Omid Yousefzade (AUT: Amirkabir University of Technology)H-Index: 9
#2Javad Jeddi (AUT: Amirkabir University of Technology)H-Index: 4
Last. Hamid Garmabi (AUT: Amirkabir University of Technology)H-Index: 21
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The effect of stearic acid-coated nano calcium carbonate (NCC) on transitions and chain mobility of poly(lactic acid) (PLA) was investigated. Dispersion state of NCC in polymeric matrix was explore...
6 CitationsSource
#1Omid Yousefzade (UPC: Polytechnic University of Catalonia)H-Index: 9
#2Sofia Valenti (UPC: Polytechnic University of Catalonia)H-Index: 3
Last. Roberto Macovez (UPC: Polytechnic University of Catalonia)H-Index: 13
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Temperature-modulated differential scanning calorimetry (TMDSC) and broadband dielectric spectroscopy (BDS) were employed to study the glass transition, size of the cooperative rearranging regions (CRRs), crystallization kinetics, and dielectric relaxation response of nanocomposites constituted by chain-extended poly(L-lactide) (PLLA) and carboxylated carbon nanotubes (f-CNTs). The CRR size and the number of relaxing structural units decreased in the presence of crystals during isothermal crysta...
7 CitationsSource
#1Omid Yousefzade (AUT: Amirkabir University of Technology)H-Index: 9
#2Lourdes FrancoH-Index: 25
Last. Hamid Garmabi (AUT: Amirkabir University of Technology)H-Index: 21
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Isothermal and nonisothermal crystallization kinetics of poly(l-lactide) and its nanocomposites with different multiwalled carbon nanotubes (i.e., pristine and functionalized) were investigated. The effects of chain extension and nanofiller content on the crystallization kinetics were also explored. The Avrami analysis was applied as a useful tool for the study of isothermal crystallization kinetics, which was also supported by optical microscopy observations. In addition, in nonisothermal cryst...
7 CitationsSource
#1Hamed Hedayati Velis (TMU: Tarbiat Modares University)H-Index: 1
#2Mohammad Golzar (TMU: Tarbiat Modares University)H-Index: 11
Last. Omid Yousefzade (AUT: Amirkabir University of Technology)H-Index: 9
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2 CitationsSource