扩链改性对聚(3-羟基丁酸酯-co-4-羟基丁酸酯)性能的影响  

Effects of Chain-Extended Modification on Properties of Poly(3-Hydroxybutyrate-co-4-Hydroxybutyrate)

作　　者：郝艳平[1] 梁宏玉 边俊甲[1] 张会良[1] 董丽松[1] 

机构地区：[1]中国科学院长春应用化学研究所生态环境高分子材料重点实验室,吉林长春130022

出　　处：《高分子材料科学与工程》2014年第3期39-42,48,共5页Polymer Materials Science & Engineering

基　　金：吉林省科技厅项目(20126023)

摘　　要：以多苯基多亚甲基多异氰酸酯(PAPI)为扩链剂,采用熔融共混法扩链改性聚(3-羟基丁酸酯-co-4-羟基丁酸酯)[P(3HB-co-4HB)]。使用凝胶渗透色谱、热失重分析仪、电子拉力机、毛细管流变仪、旋转流变仪等研究了PAPI添加量对P(3HB-co-4HB)的相对分子质量、热稳定性、力学性能以及流变性能的影响。结果表明,PAPI的使用能够提高P(3HB-co-4HB)的相对分子质量和熔体黏度,并能有效改善P(3HB-co-4HB)的热稳定性和力学性能,成功实现了对P(3HB-co-4HB)的扩链改性。PAPI的添加量为2.0phr时,体系综合性能最佳,其起始分解温度和最大分解温度分别比纯P(3HB-co-4HB)提高了16.7℃和11.4℃,其拉伸强度和断裂伸长率分别比纯P(3HB-co-4HB)提高了21%和218%。Poly（3-hydroxybutyrate-co-4-hydroxybutyrate）[P（3HB-co-4HB）] was chain extended using polyaryl polymethylene isocyanate （PAPI） as chain extender via melt reaction. GPC, TGA, tensile measurement, capillary rheometer and dynamic rheological tests were used to characterize the effects of PAPI dosage on relative molecular mass, thermal stability, mechanical properties and rheological properties. The results show that the relative molecular mass, viscosity, thermal stability and mechanical properties of P（3HB-co-4HB） are improved with the addition of PAPI. The comprehensive properties of P（3HB-co-4HB） achieve the optimum value when adding 2.0phr PAPI; compared with those of pure P（3HB-co-4HB）, the onset degradation temperature and the maximum temperature increase by 16.7 ℃ and 11.4 ℃ respectively, the tensile strength and elongation at break increase by 21% and 218%,respectively.

关 键 词：聚(3-羟基丁酸酯-co-4-羟基丁酸酯) 多苯基多亚甲基多异氰酸酯 扩链改性 

分 类 号：TQ316.63[化学工程—高聚物工业]