【摘要】 用辛酸亚锡作催化剂,在二乙酸纤维素存在下,通过L-丙交酯和乙交酯的开环聚合,制备了一种新型生物降解热熔胶基体树脂二乙酸纤维素和聚乙丙交酯化学共混物CDA-PLLGA。通过对共混物中所含的接枝共聚物CDA-g-PLLGA的红外光谱和凝胶渗透色谱分析,估测其具有短刷状支化结构,并在共混过程中起增容剂作用。用差示扫描量热法、热重分析法和拉伸试验法等测定了CDA-PLLGA的玻璃化温度、熔点、热失重性能、拉伸强度和降解性能。结果表明,CDA-PLLGA具有良好的热稳定性和强度,降解速度可以通过改变化学共混物中CDA的比例加以控制,因而是一种理想的生物降解热熔胶基体树脂。更多还原

【Abstract】 A new matrix resin of cellulose diacetate and poly(L-lactide-co-glycolide) blend CDA-PLLGA which was suitable for biodegradable hot melt adhesive was prepared by opening polymerization of L-lactide and glycolide in the presence of cellulose diacetate with stannous octoate as catalyst.The brush-like structure of graft copolymer CDA-g-PLLGA contained in this polyblend which was regarded as a compatibilizer in blending was estimated by IR and GPC analysis.The glass transition temperature Tg,melt point Tm,thermogravimetric curve,tensile strength and degradation rate of this blend were determined by DSC,TGA,tensile test and degradation test.The results showed that the blend had good thermostability and high tensile strength.Another advantage was that the degradation rate of the blend could be controlled by changing the proportion of CDA in the blend.So it was an excellent matrix resin for biodegradable hot melt adhesive.更多还原