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钱志勇, ZhiYong Qian, Sai Li, Yi He, XiaoBo Liu*
Polymer Degradation and Stability 83 (2004) 93-100,-0001,():
-1年11月30日
Hydrolytically degradable PET/PEG block copolymer was synthesized by the macromolecular transesterification method from PET and PEG. Non-isothermal crystallization behavior of the copolymers was investigated by differential scanning calorimetry (DSC). Water absorption and in vitro degradation behaviour of these copolymers were studied in detail. When hydrophilic PEG was incorporated into the PET chain, water absorption increased. With the increase in PEG concentration, the degradation rate increased accordingly. PEG molecular weight has different effects on PET/PEG copolymers' degradation rate.
Block copolymer, PET/, PEG, Thermal property, Hydrolytic degradation, Poly(, ether-ester), s
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【期刊论文】Preparation of biodegradable polyesteramide microspheres
钱志勇, Zhiyong Qian, Sai Li, Yi He, Hailian Zhang, Xiaobo Liu
Colloid Polym Sci (2004) 282: 1083-1088,-0001,():
-1年11月30日
Biodegradable polyesteramide copolymer P(CL/AU) based on -caprolactone and 11-aminoundecanoic acid was synthesized by the melt polycondensation method. Polyesteramide (PEA) microspheres were prepared by a simple O/W emulsion solvent evaporation method. The effects of variations in preparation parameters (such as emulsifier concentration, polymer concentration, polymer solution adding rate, stirring rate, and whether vacuum was applied) were studied in detail. The obtained microsphere morphologies were observed using an optical microscope and via scanning electron microscopy (SEM). The particle size distribution was determined using a Malvern laser particle sizer. When the PEA microspheres were incubated in PBS saline, the particle size increased at first, and then decreased after a longer time period; the theory that this behavior was due to degradation of the microspheres was confirmed by SEM.
Polyesteramide, Microspheres, Solvent evaporation method, Surface morphology
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钱志勇, ZhiYong Qian a, *, Sai Li b, Yi He b, Xiao Bo Liu b
Polymer Degradation and Stability 84 (2004) 41-47,-0001,():
-1年11月30日
A new kind of aliphatic polyetheresteramide copolymers (PEEAs) based on E-caprolactone, 11-aminoundecanoic acid, and poly(ethylene glycol) (PEG) were synthesized by melt polycondensation. The thermal and hydrolytic egradation behaviour of these copolymers was studied using FTIR, 1H-NMR, and TGA. PEG content, thickness of the test sample, and pH of degradation medium have great effect on degradation rate. The degradation rate increased with PEG content and pH, but decreased with thickness of the test sample.
Polyetheresteramide, Degradable polymer, Thermal degradation, Hydrolytic degradation, TG
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钱志勇, Qian Zhiyong, Li Sai, Zhang Hailian, Liu Xiaobo
Colloid Polym Sci (2003) 281: 869-875,-0001,():
-1年11月30日
A new type of biodegrad-able polyesteramide P(LA/AU) based on lactic acid and aminoun-decanoic acid was synthesized by the meh polycondensation method. The copolymers obtained were charac-terized by FTIR. 1H-NMR, DSC, and XRD. The in vitro degradation behavior of the copolymers was studied using weighing. 1H-NMR. FT1R, DSC. and SEM. With the increase in aminonndecanoic acid units, the mehing temperature and crystallinity increased, but the water absorption and degradation rate decreased accordingly. During degradation in vitro, the ester moiety decreased due to ester cleav-age along the macromolecular main chain. As degradation proceeded. the mehing temperature and crystallinity increased at first, then started to decrease because the crystalline phase was destroyed.
Polyesteramide, Biodegradable polymer, Hydrolytic degradation, Aminoundecanoic acid, Surface morphology
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钱志勇, CaiBing Liu a, ZhiYong Qian a, *, YingChun Gu b, LinYu Fan c, Jun Li d, GuoTao Chao a, WenJuan Jia a, MingJing Tu a
Materials Letters 60 (2006) 31-38,-0001,():
-1年11月30日
In this paper, biodegradable aliphatic copolyesters were synthesized from q-caprolactone, adipic acid, and 1,6-hexanediol by meltpolycondensation method. The chemical structure, and thermal properties of these copolymers were studied in detail. The water absorption behavior and hydrolytic degradation behavior of this copolyester were also studied. This aliphatic copolyester prepolymer would be used to prepare the biodegradable poly(ester urethane), which might have potential application in biomedical field.
Biodegradable copolymer, Poly(, ester urethane), , Aliphatic polyester, Thermal property, In vitro degradation
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