PEG与TMB-5对PLLA结晶及性能的协同影响  

Effects of PEG and TMB-5 on the Crystallization and Properties of PLLA

作　　者：武学坚 罗发亮[1] 齐亚平 邢倩[2] 王克智 WU Xuejian;LUO Faliang;QI Yaping;XING Qian;WANG Kezhi(State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering,Ningxia University,Yinchuan,750021,China;School of Material and Mechanical Engineering,Beijing Technology and Business University,Beijing 100048,China;Shanxi Provincial Institute of Chemical Industry,Taiyuan 030021,China)

机构地区：[1]宁夏大学省部共建煤炭高效利用与绿色化工国家重点实验室,宁夏银川750021 [2]北京工商大学材料与机械工程学院,北京100048 [3]山西化工研究所,山西太原030021

出　　处：《石油学报（石油加工）》2018年第5期995-1003,共9页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(21264012);宁夏回族自治区化学工程与技术国内一流学科资助项目(NXYLXK2017A04)资助

摘　　要：聚乳酸(PLLA)结晶速率慢、韧性差,通过联合添加成核剂(TMB-5)克服PLLA难以成核,添加链段运动调节剂聚乙二醇(PEG)提高PLLA链段运动能力以实现PLLA结晶与性能的调控。采用差示扫描量热仪(DSC)、X射线衍射仪(XRD)、小角X射线衍射仪(SAXD)、偏光显微镜(POM)和力学性能测试,考察了不同配比的TMB-5和PEG对PLLA的结晶行为与韧性的影响。结果表明,在PLLA中添加TMB-5和PEG,PLLA的玻璃化转变温度下降,结晶峰温度向高温方向移动,结晶速率加快,球晶尺寸变大,同时伴随有环带球晶的出现,但对PLLA的结构和晶型没有影响。力学测试表明,TMB-5/PEG协同改善了PLLA的韧性,当添加质量分数0.5%的TMB-5和质量分数3%的PEG时,PLLA/TMB-5/PEG三元共混物的韧性达到5.05kJ/m2,比PLLA/TMB-5二元共混物、PLLA分别提高了22.9%和150%。In order to overcome problems of slow crystallization rate and poor toughness of poly(L-lactic acid)(PLLA),the nucleating agent(TMB-5)and the chain segment motion agent polyethylene glycol(PEG)were simultaneously added to PLLA to overcome the difficulty of nucleation and improve the chain segment motion ability of PLLA.Their effects on the crystallization behaviors and toughness of PLLA were systematically investigated by differential scanning calorimetry(DSC),X-ray diffraction(XRD),small angle X-ray diffraction(SAXD),polarized optical microscopy(POM)and mechanical properties test.The results showed that the addition of TMB-5 and PEG led to the glass transition temperature decrease.The crystallization temperature of PLLA/TMB-5/PEG blends shift to the high temperature,and the nucleation rate and the crystallization rate also increase.Moreover,the banded texture could be observed with increasing of PEG content.But the structure and crystal form of PLLA was not affected.Mechanical tests showed that TMB-5 and PEG could improve the toughness of PLLA.The highest impact strength occurred when adding the mass fraction of the TMB-5/PEG was 0.5%and 3%.The value of the highest impact strength was 5.05 kJ/m 2 and increased by 22.9%and 150%than PLLA/TMB-5 blends and PLLA,respectively.

关 键 词：聚乳酸 聚乙二醇(PEG) TMB-5 结晶 韧性 

分 类 号：TQ321.2[化学工程—合成树脂塑料工业]