New type of thermoplastic multiblock elastomers––poly(ester-block-amide)s––based on oligoamide 12 and oligoester prepared from dimerized fatty acid

Kozłowska, A.; Ukielski, Ryszard

doi:10.1016/j.eurpolymj.2004.07.011

Cited by 18 publications

(16 citation statements)

References 9 publications

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“…As presented in Figure , a broad melting transition, T m , is found for all the samples, which is attributed to the broad molecular weight distribution of hard phases owing to the transesterification of PTMG and EG . Even so, the T m s of C‐TPEEs ( Table 2 ) are still comparable with other elastomers reported in the literatures . Moreover, due to the competing effects of the micro cross‐linking sites on the crystallization of the elastomers, the T m s of C‐TPEEs decrease after the first increase with increasing the BTCA molar fraction.…”

Section: Resultssupporting

confidence: 61%

Enhanced Mechanical Properties of PET‐Based Thermoplastic Elastomers: Brittle–Ductile Transition via Micro Cross‐linking Technology

Yuan

Fan

Sun

et al. 2019

Macro Chemistry & Physics

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A novel micro cross‐linking technology is proposed to enhance the mechanical properties of poly(ethylene terephthalate) (PET)‐based thermoplasctic elastomers (TPEEs) whose molecular weights are difficultly increased via traditional synthetic technologies. It is found that the brittle fractures of TPEEs, usually observed in polymers with low molecular weights, can be converted into ductile form with the introduction of a certain fraction of 1,2,3,4‐butane tetracarboxylic acid as a cross‐linking agent. Unlike the traditional cross‐linking technologies, which usually cause the elastomers to suffer the deficiencies of extremely high stiffness, inherent weakness, and the inability to be efficiently reused, TPEEs still maintain their elastomeric characteristics well with the incorporation of micro cross‐linking structure and are endowed with a well‐defined microphase‐separated structure, excellent tensile properties, and the abilities to be melt‐processed and reused. This work offers a new guideline to improve the mechanical properties for polymers with relatively low molecular weights.

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Section: Resultssupporting

confidence: 61%

Enhanced Mechanical Properties of PET‐Based Thermoplastic Elastomers: Brittle–Ductile Transition via Micro Cross‐linking Technology

Yuan

Fan

Sun

et al. 2019

Macro Chemistry & Physics

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“…This softening temperature obtained around 150°C is named as distortion temperature. 37 The values for loss modulus ( E ″) and the tangent delta (tan δ) were obtained as one maximum and defined as glass transition temperature ( Tg = −48°C). At this low temperature, movements of chains of soft segments occur and this maximum therefore shows the relaxation of amorphous phase.…”

Section: Resultsmentioning

confidence: 99%

Immobilization of heparin on chitosan-grafted polyurethane films to enhance anti-adhesive and antibacterial properties

Kara

Aksoy

Çalamak

et al. 2015

Journal of Bioactive and Compatible Polymers

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Infections caused by bacteria adhering to implant surfaces are one of the main reasons for the failure of the implants. In this study, polyurethane (PU), which is the most commonly used polymer in the production of medical devices, was synthesized and surfaces of polyurethane films were modified by chitosan (CH) grafting and heparin (Hep) immobilization in order to enhance anti-adhesiveness and antibacterial properties. Functional groups present on the surface, topographical shapes, and free energies of the polyurethane films were determined. Pristine polyurethane, chitosan-grafted polyurethane (PU–CH), and heparin immobilized polyurethane (PU–CH–Hep) films demonstrated high anti-adhesive efficacy against bacteria in the given order, where PU–CH–Hep was the most effective one. When PU–CH–Hep samples were incubated with different bacteria, complete death was observed for Pseudomonas aeruginosa (Gram negative), Staphylococcus aureus (Gram positive), and Staphylococcus epidermidis (Gram positive). Some living Escherichia coli (Gram negative) were observed after 24 h of incubation. Pristine and modified polyurethane samples demonstrated no adverse effect on proliferation of L929 fibroblast cells and were found to be biocompatible according to MTT cytotoxicity tests.

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“…It is also possible to produce biobased polyester thermoplastics [48,49]; Petrovic et al produced a high-molecular-weight linear polyester utilizing a selftransesterification reaction of 9-hydroxynonanoic acid, a hydroxyl acid produced from castor oil [49]. The polymer produced from 9-hydroxynonanoic acid (PHNME) is analogous to polycaprolactone (PCL), but has a longer hydrocarbon chain between the ester groups [49].…”

Section: Polyestersmentioning

confidence: 99%

Monomers and Resulting Polymers from Biomass

Bergman

Kessler

2014

Introduction to Chemicals From Biomass

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New type of thermoplastic multiblock elastomers––poly(ester-block-amide)s––based on oligoamide 12 and oligoester prepared from dimerized fatty acid

Cited by 18 publications

References 9 publications

Enhanced Mechanical Properties of PET‐Based Thermoplastic Elastomers: Brittle–Ductile Transition via Micro Cross‐linking Technology

Enhanced Mechanical Properties of PET‐Based Thermoplastic Elastomers: Brittle–Ductile Transition via Micro Cross‐linking Technology

Immobilization of heparin on chitosan-grafted polyurethane films to enhance anti-adhesive and antibacterial properties

Monomers and Resulting Polymers from Biomass

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