聚(甲基)硅氧烷/聚羟基丁酸酯/聚己内酯复合膜的制备及性能表征  

Preparation and characterization of poly(methyl)siloxane/polyhydroxybutyrate/polycaprolactone composite films

作　　者：陈海英 张晨清 张豪 陈程 金光远 卫灵君 CHEN Haiying;ZHANG Chenqing;ZHANG Hao;CHEN Cheng;JIN Guangyuan;WEI Lingjun(Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology,School of Mechanical Engineering,Jiangnan University,Wuxi 214122,China)

机构地区：[1]江苏省食品先进制造装备技术重点实验室,江南大学机械工程学院,江苏无锡214122

出　　处：《中国塑料》2022年第12期50-56,共7页China Plastics

摘　　要：将2%(质量分数,下同)聚(甲基)硅氧烷(PMSQ)添加到不同比例的聚羟基丁酸酯(PHB)/聚己内酯(PCL)体系(25∶75、50∶50、75∶25)中,并以溶液浇铸法制备薄膜,研究PMSQ对PHB/PCL薄膜力学及理化性能的影响。结果表明,PMSQ对PHB25/PCL75的改善效果最好,其断裂伸长率从22.45%提升至70.83%,提升了3.15倍;FTIR光谱显示PMSQ的甲基(—CH3)吸收峰消失,PHB/PCL体系中C=O吸收峰增强,表明PHB和PCL接枝到PMSQ微球上;PMSQ的加入降低了PHB和PCL颗粒的粒径尺寸,同时PHB和PCL相分离现象得到改善,相容性提高;PMSQ的加入限制了PHB和PCL分子链的运动,破坏了PHB和PCL在空间上的规整性,结晶度降低;PMSQ的加入提高了所有比例的PHB/PCL体系的起始降解温度,同时提高了PHB和PCL的热稳定性,改善程度与两种组分比例相关。To evaluate the effect of poly(methyl)siloxane(PMSQ)on the mechanical and physicochemical properties of PHB/PCL films,2 wt%PMSQ was added to the polyhydroxybutyrate(PHB)/polycaprolactone(PCL)blending systems with mass ratios of 25∶75,50∶50,75∶25 to prepare films by solution casting method.The results indicated that PMSQ exhibited an optimal enhancing effect on the tensile performance of the PHB25/PCL75 blends,resulting in an increase in elongation at break from 22.45%to 70.83%.FTIR spectra demonstrated the disappearance of the methyl(—CH3)absorption peak of PMSQ along with an enhancement in the absorption peak intensity of the C=O bond in the PHB/PCL blending system.These results indicated that PHB and PCL were grafted onto PMSQ microspheres.SEM observation showed that the addi⁃tion of PMSQ reduced the particle size of the PHB and PCL domains.The phase separation between the PHB and PCL phas⁃es was depressed due to an enhancement in their compatibility.DSC analysis suggested that the addition of PMSQ restricted the motion of PHB and PCL molecular chains and disrupted their spatial regularity,thus resulting in a decrease in crystallinity.In addition,TGA analysis indicated the addition of PMSQ increased the onset degradation temperature of the PHB/PCL blending systems and enhanced their thermal stability in accordance with the mass ratio of the two components.

关 键 词：聚羟基丁酸酯 聚己内酯 聚硅氧烷 力学性能 热稳定性 

分 类 号：TQ320.721[化学工程—合成树脂塑料工业]