中国科技论文在线

上传时间

2006年10月31日

【期刊论文】Synthesis, characterization, and thermal properties of biodegradable aliphatic copolyester based on q-caprolactone, adipic acid, and 1,6-hexanediol

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

摘要

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

60浏览
0点赞
0收藏
0分享
195下载
0

引用

上传时间

2006年10月31日

【期刊论文】Thermal and hydrolytic degradation behaviour of degradable poly(etheresteramide) copolymers based on E-caprolactone, 11-aminoundecanoic acid, and poly(ethylene glycol)

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

摘要

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

81浏览
0点赞
0收藏
0分享
413下载
0

引用

上传时间

2006年10月31日

【期刊论文】Synthesis, characterization and in vitro degradation of biodegradable polyesteramide based on lactic acid

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

摘要

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

72浏览
0点赞
0收藏
0分享
66下载
0

引用

上传时间

2006年10月31日

【期刊论文】Synthesis and in vitro degradation study of poly(ethylene terephthalate)/poly(ethylene glycol) (PET/PEG) multiblock copolymer

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

摘要

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

147浏览
0点赞
0收藏
0分享
898下载
0

引用

上传时间

2006年10月31日

【期刊论文】OPmraeparation and Characterization of pH Sensitive Semi-interpenetrating Network Hydrogel Based on Methacrylic Acid, Bovine Serum Albumin (BSA), and PEG

钱志勇， GuoTao Chao，， HongXin Deng， †， Qiong Huang， WenJuan Jia， WanXia Huang， YingChun Gu， HePing Tan， LinYu Fan， CaiBing Liu， AnLiang Huang， Ke Lei， ChangYang Gong， MingJing Tu and ZhiYong Qian， *

Journal of Polymer Research (2006) 13: 349-355，-0001，（）：

-1年11月30日

摘要

In this article, a pH sensitive semi-interpenetrating network (SIPN) hydrogel based on methacrylic acid, BSA, and PEG was prepared by UV initiated free radical polymerization. The swelling behavior and pH sensitivity of these hydrogels were studied in detail. With the increase in pH of the aqueous solution from 1.7 to 9.23, the swelling ratio of these hydrogels increased accordingly. The effect of BSA and crosslinker (BIS) content on the swelling behavior was more complicated, and the results were shown in the text.

hydrogel， macromolecular drug delivery， responsive delivery systems， water absorption

42浏览
0点赞
0收藏
0分享
422下载
0

引用