摘要
以反丁烯二酸、一缩二乙二醇和1,4-丁二醇为原料,采用熔融缩聚法合成了不饱和脂肪族聚酯和共聚酯,在37℃下,用含有脂肪酶的磷酸缓冲溶液对聚酯的生物降解性进行了研究,讨论了聚酯结构、组成及C=C双键的交联度对生物降解性的影响。结果表明,对于粘稠液体状的聚酯,C=C双键的引入,没有明显的改变其生物降解性;对于固体状的聚酯,C=C双键引入后,熔点(Tm)和结晶度增加;聚酯部分降解后,其热力学性能(Tm、-ΔHm)和结晶度都升高;对于交联后的聚酯,交联度越高,生物降解性越差。
Unsaturated aliphatic polyesters and copolyesters were prepared fi＇om fumaric acid （ FA）, dieth- ylene glycol （DEG） and 1,4-butanediol （BD） by melt polycondensation method. Enzymatic degradation was performed at 37℃ in phosphate buffer solution with porcine pancreas lipase, effect of structures, compositions and cross-linking degrees of carbon-carbon double bonds of polyesters on the biodegradability were discussed. The results indicated that, as the C=C double bond introduced into the backbone of solid polyesters, T value and crystallinity increased. The degradability of aliphatic polyesters by lipases depended strongly on their Tm values and crystallinity, the higher the Tm and crystallinity, the lower the de- gradability. The result also indicated that the thermal properties （ Tm value and - AH, o value） and crystallinity of polyesters increased after partially enzymatic degradation, the biodegradation of unsaturated all- phatic polyester became smaller after cross-linked, biodegradation. and the higher the cross-linking degree, the smaller the
出处
《应用化工》
CAS
CSCD
2013年第3期490-494,共5页
Applied Chemical Industry
关键词
不饱和脂肪族聚酯
熔融聚合
生物降解性
交联度
共聚酯
unsaturated aliphatie polyester
melt polycondensation
biodegradability
cross-linking degree
copolyesters
