右旋聚乳酸-己内酯无规共聚物对左旋聚乳酸/聚己内酯共混物的结构调控和性能  

Effect of Poly(D-lactide)-r-Poly(ε-caprolactone) Random Copolymer on Structure Regulation and Properties of Poly(L-lactide)/ Poly(ε-caprolactone) Blends

作　　者：杨博 李琦 李晓露 齐悦 董振峰[1] 王锐[1] 张秀芹[1] Bo Yang;Qi Li;Xiaolu Li;Yue Qi;Zhenfeng Dong;Rui Wang;Xiuqin Zhang(School of Materials Science and Engineering ,Beijing Key Laboratory of Clothing Materials R&D and Assessment ,Beijing Engineering Research Center of Textile Nanofiber,Beijing Institute of Fashion Technology ,Beijing 100029 ,China)

机构地区：[1]北京服装学院材料科学与工程学院服装材料研究开发与评价北京市重点实验室北京市纺织纳米纤维工程技术研究中心,北京100029

出　　处：《高分子材料科学与工程》2019年第4期79-86,共8页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51673003);"重点基础材料技术提升与产业化"重点专项(2017YFB0309300);北京市"长城学者"支持计划(CTT&TCD20180321)

摘　　要：采用熔融共混法制备左旋聚乳酸(PLLA)、聚己内酯(PCL)和右旋乳酸-己内酯无规共聚物(PDLA-r-PCL)的共混物。通过差示扫描量热仪、扫描电子显微镜、X射线衍射和拉伸测试等手段探究了相容剂PDLA-r-PCL对PLLA/PCL共混物结构和性能的影响。结果表明,随着PDLA-r-PCL含量的增加,共混物中立构晶(SC)含量增加;降温过程中,α晶结晶温度由93℃提高至108℃,表明SC晶对共混体系中α晶有异相成核作用。无规共聚物PDLA-r-PCL的加入,显著改善了PLLA与PCL的相容性,且随着无规共聚物含量增加,共混物中PCL的相尺寸减小,界面模糊;与PLLA/PCL相比,淬冷和退火处理PLLA/PCL/PDLA-r-PCL共混物的断裂伸长率提高,且强度也略微提升;并且PDLA-r-PCL可有效提高退火的PLLA/PCL样品的冲击强度。Poly(D-lactide)-r-poly(ε-caprolactone)(PDLA-r-PCL) was used as compatibilizer for preparing poly(L-lactide) blends with poly(ε-caprolactone)(PLLA/PCL) by melt blending. The effects of PDLA-r-PCL on the structure and properties of PLLA/PCL blends were studied by differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and X-ray diffraction and tensile testing (XRD). With the increase of PDLA-r-PCL content, the content of stereocomplex crystal (SC) in the blends gradually increases. And the crystallization temperature of α crystal increases from 93 ℃ to 108 ℃, which indicates that the existence of SC could improve the nucleation of α crystal. With the addition of PDLA-r-PCL, the compatibility of PLLA and PCL is significantly improved. With the increasing of PDLA-r-PCL content, the phase size of PCL decreases and the interface becomes blurred. The elongation at break of PLLA/PCL/PDLA-r-PCL after quenching and annealing is higher than that of PLLA/PCL. Meanwhile, the strength of PLLA/PCL/PDLA-r-PCL is slightly increased. The introduction of PDLA-r-PCL could effectively enhance the impact strength of PLLA/PCL annealed samples.

关 键 词：左旋聚乳酸 聚己内酯 右旋聚乳酸-己内酯无规共聚物 结晶 力学性能 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]