【摘要】 采用溶液浇铸法制备了含不同成核剂的生物可降解聚羟基丁酸己酸酯(PHBHHx)样品,利用热台偏光显微镜(POM)和差示扫描量热(DSC)法研究了成核剂对PHBHHx结晶行为和热性能的影响,并对比了氮化硼、羟基磷灰石和木质素磺酸钠三种成核剂的效果。结果表明,加入成核剂后,PHBHHx的结晶发生异相成核,球晶数目增加,从POM的结果看,木质素磺酸钠的成核效果最好。PHBHHx的结晶诱导期大大缩短,含木质素磺酸钠的PHBH-Hx的效果尤其明显。等温结晶和非等温结晶的DSC分析表明,羟基磷灰石促进结晶的能力最强。更多还原

【Abstract】 Biodegradable PHBHHx samples containing different nucleating agents were prepared by solvent-casting method.Effects of nucleating agents to the crystallization and thermal properties of PHBHHx were studied by hot-stage polarized optical microscopy(POM)and differential scanning calorimetry(DSC).The efficiency of three different nucleating agents:boron nitride,hydroxyapatite and sodium lignosulphonate,were contrasted.The results showed that heterogeneous nucleation occurred in PHBHHx after introducing nucleating agents and the number of PHBHHx spherulites was increased.The best nucleating were obtained on sodium lignosulphonate based on POM results.The induction period of PHBHHx crystallization was shortened greatly,especially in PHBHHx containing sodium lignosulphonate.The DSC results of isothermal crystallization and non-isothermal crystallization of PHBHHx samples showed that hydroxyapatite served best in promoting crystallization.更多还原