多臂聚-D-乳酸的合成与表征  

Synthesis and Characterization of Multiarm Poly( D-lactide)

作　　者：邹俊[1] 李鑫 徐海青[2] 张宜辉[1] 苏乐乐 Jun Zou;Xin Li;Haiqing Xu;Yihui Zhang;Lele Su(College of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;Jiangsu Provincial Engineering Laboratory for Advanced Materials of Salt Chemical Industry,Huaiyin Institute of Technology,Huai ＇ an 223003,China)

机构地区：[1]江苏科技大学材料科学与工程学院,江苏镇江212003 [2]淮阴工学院江苏省盐化工新材料工程实验室,江苏淮安223003

出　　处：《高分子材料科学与工程》2018年第7期35-40,47,共7页Polymer Materials Science & Engineering

基　　金：江苏省重大科技支撑计划(工业)与自主创新项目(BE2014881);江苏省盐化工新材料工程实验室开放基金(2065031701)

摘　　要：以右旋丙交酯(D-LA)与八环氧笼型多面体低聚倍半硅氧烷(EPOSS)为原料,辛酸亚锡(Sn(Oct)2)为催化剂,无水二甲苯为溶剂,通过原位开环聚合法制备多臂聚-D-乳酸(PDLA-EPOSS),通过红外光谱、核磁共振、X射线衍射、凝胶渗透色谱、动态力学分析和热重分析研究了不同含量EPOSS对PDLA-EPOSS的化学结构、晶体结构、分子链结构、重均相对分子质量及其分布(PDI)和性能的影响。结果表明,成功合成了具有多臂支化结构、晶体结构与PDLA相同、相对分子质量可控且相对分子质量分布较窄、热稳定性良好的PDLA-EPOSS共聚物。并且随着EPOSS含量的增加,PDLA-EPOSS的重均相对分子质量先增加后减小、PDI增加、储能模量与损耗因子增加,热分解温度先升高后下降。在EPOSS摩尔分数为5.0×10-5%时,共聚物的相对分子质量与热分解温度最高,分别为1.27×106、287.73℃。这些结果对于研究PDLA-EPOSS对PLLA结晶性能的影响有一定的参考价值。Using right-handed lactide（ D-LA） and eight cage epoxy polyhedral oligomeric silsesquioxane（ EPOSS）as raw materials,stannous octoate（ Sn（ Oct）2） as catalyst and the multiarm poly（ D-lactide）（ PDLA-EPOSS） was prepared by in-situ ring-opening polymerization. The chemical structure,crystal structure,molecular chain structure,weight average molecular weight,molecular weight distribution and properties of PDLA-EPOSS copolymers were characterized by Fourier transform infrared spectroscopy（ FT-IR）,nuclear magnetic resonance（1 H-NMR）,X-ray diffraction（ XRD）,gel permeation chromatography（ GPC）,dynamic thermomechanical analysis apparatus（ DMA） and thermogravimetric analysis（ TGA）. The results show that the PDLA-EPOSS copolymer with multi-arm branched structure and crystal structure is the same as PDLA,and the molecular weight is controlled and the molecular weight distribution is narrow and the thermal stability is good. With the increase of EPOSS content,the average molecular weight of PDLAEPOSS increases first and then decreases,and the PDI increases,the storage modulus and loss factor increase,and the thermal decomposition temperature increases first and then decreases. When the molar fraction of EPOSS is 5. 0 ×10^-5%,the molecular weight and thermal decomposition temperature of the copolymer are 1. 27 × 106 and 287. 73 ℃ respectively.

关 键 词：右旋丙交酯 八环氧笼型多面体低聚倍半硅氧烷 多臂聚-D-乳酸 相对分子质量可控 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]