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Hydrolytic Degradation of Biobased Poly(butylene succinate-co-furandicarboxylate) and Poly(butylene adipate-co-furandicarboxylate) Copolyesters under Mild Conditions
关键字：biodegradable; biopolymers and renewable polymers; degradation; polyesters
It is indispensable to investigate hydrolytic degradation behavior to develop novel (bio)degradable polyesters. Biobased and biodegradable copolyesters poly(butylene adipate-co-butylene furandicarboxylate) (PBAF) and poly(butylene succinate-co-butylene furandicarboxylate) (PBSF) with BF molar fraction (/BF) between 40 and 60% were synthesized in this study. The hydrolyt...
http://www.polymer.cn/research/sy_info19502 |
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DBU-Catalyzed Biobased Poly(ethylene 2,5-furandicarboxylate) Polyester with Rapid Melt Crystallization: Synthesis, Crystallization Kinetics and Melting Behaviors.
关键字：Biobased polymers, Poly(ethylene furandicarboxylate), Crystallization
Poly(ethylene 2,5-furandicarboxylate) (PEF) is in the spotlight as a newly emerged biobased
polyester in recent years. Usually, PEF exhibits very slow and weak melt crystallization behavior. In this study, PEF synthesis via transesterification polycondensation method catalyzed by 1,8-diazabicylo[5.4.0]undec-7-ene (DBU) as an organic nonmetallic catalyst was attempted...
http://www.polymer.cn/research/sy_info19501 |
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Temperature dependent morphological evolution and the formation mechanism of anisotropic nano-aggregates from a crystalline-coil block copolymer of poly(p-dioxanone) and poly(ethylene glycol)
关键字：Crystallization induced self-assembly
The morphological evolution and phase transition of a branched crystalline-coil multi-block copolymer, poly(p-dioxanone)-block-poly(ethylene glycol) (PPDOstar-b-PEG), in aqueous solution under heating and cooling were investigated. The changes in size and morphology of the nano-aggregates were monitored by dynamic light scattering (DLS), transmission electron microscopy (TEM) and ...
http://www.polymer.cn/research/sy_info19499 |
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Hydrogen bond cross-linked sulfonated poly(imino ether ether ketone) (PIEEK) for fuel cell membranes
关键字：Fuel cell membranes, Poly(imino ether ether ketone)
A new diamine monomer, 3,30-dihydroxydiphenylamine, is prepared by the palladium catalyzed CeN coupling reaction and the following reduction reaction of 3-bromoanisole and m-anisidine. A series of novel hydrogen bond cross-linked sulfonated poly(imino ether ether ketone) (SPIEEK) are obtained by the copolymerization of sodium 5,50-carbonylbis(2-fluorobenzene sulfonate), 4,40-difluorobenzophenone...
http://www.polymer.cn/research/sy_info19474 |
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Poly(L?lactic acid)-block-poly(butylene succinate-co-butylene adipate) Multiblock Copolymers: From Synthesis to Thermo-Mechanical Properties
关键字：biodegradable, multi-block copolymer, chain extension, chain coupling
Multiblock copolymers poly(L-lactic acid)-block-poly(butylene succinate-co-butylene adipate)s (abbr. P(LLA-mb-
BSA)s) are synthesized via a polycondensation/chain extension/coupling method using binary chain extenders. A poly(L-lactic acid) (PLLA) prepolymer synthesized via direct melt polycondensation of L-lactic acid is rapidly chain extended with a bis (2-oxazoline) to form hydroxyl t...
http://www.polymer.cn/research/sy_info19423 |
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Crystallization-Driven Surface Segregation and Surface Structures in Poly(L-lactide)-block-Poly(ethylene glycol) Copolymer Thick Films
关键字：surface segregation, crystallization, block copolymer thin film
In this work, we used poly(L-lactide)-blockpoly(ethylene glycol) (PLLA-b-PEG) copolymer thick films to investigate the effect of crystallization on surface segregation, surface crystal orientation, and morphology by attenuated total reflection Fourier transform infrared spectroscopy (ATRFTIR), reflection optical microscopy (ROM), and twodimensional grazing incident wide-angle X-ray scattering (2...
http://www.polymer.cn/research/sy_info19410 |
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Grafting of telechelic poly(lactic-co-glycolic acid) onto O2 Plasma Treated Polypropylene Flakes
关键字：polypropylene; telechelic poly(lactic-coglycolic acid); oxygen plasma; grafting
In this work, we described a facile approach to preparing polypropylene (PP) surface functionalized with telechelic poly(lactic-co-glycolic acid) (HOPLGA-COOH). The PP flakes were first treated with oxygen plasma and then grafted with different molecular
weight PLGA (Mw ? 50, 100, and 300 K) in dry dichloromethane solution with the addition of phosphorus pentachloride (PCl...
http://www.polymer.cn/research/sy_info19404 |
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Novel crosslinked membranes based on sulfonated poly(ether ether ketone) for direct methanol fuel cells
关键字：crosslinked membranes，sulfonated poly(ether ether ketone)，direct methanol fuel cells
Novel covalently crosslinked membranes based on sulfonated poly(ether ether ketone) and carboxylated polysulfone exhibit much lower methanol crossover and better performance in direct methanol fuel cells at 65oC in 1 and 2 M methanol solutions compared to Nafion 115 membranes.
http://www.polymer.cn/research/sy_info18190 |
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Improving hemocompatibility of styrene-b-(ethylene-co-butylene)-b-styrene elastomer via N-vinyl pyrrolidone-assisted grafting of poly(ethylene glycol) methacrylate
关键字：Styrenic thermoplastic elastomer, Melt free radical grafting, Poly(ethylene glycol)
In this work, in order to enhance the grafting degree, N-vinyl pyrrolidone (NVP) was used to assist the melt grafting of the macromonomer-poly(ethylene glycol) methyl ether methacrylate (PEGM)-which has good hemocompatible property, onto styrene-b-(ethylene-co-butylene)-b-styrene (SEBS) elastomer with free radical initiator. The grafting degree of PEGM with NVP assistance was incr...
http://www.polymer.cn/research/sy_info17632 |
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polypropylene blends with poly (styrene-b-(ethylene-co-butylene)-b-styrene) under irradiation: A comparative investigation
关键字：Electron beam irradiation, Poly (styrene-b-(ethylene-co-butylene)-b-styrene) (SEBS), Polypropylene (PP), Crystallinity, Molecular weight
The aim of this paper is to investigate the stabilization of polypropylene in the poly (styrene-b-(ethyleneco-butylene)-b-styrene) (SEBS)/polypropylene (PP) blends under irradiation with respect to PP. The PP films, SEBS/PP films were subjected to electron beam irradiation and characterized by wide angle X-raydiffraction (WAXD), differential scanning calorimetry (DSC), gel permeation chromato...
http://www.polymer.cn/research/sy_info17627 |
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