朱爽,韩克清,黄爽,孙旭鹏
ZHU Shuang,HAN Ke-qing,HUANG Shuang,SUN Xu-peng

• 1:东华大学纤维材料改性国家重点实验室材料科学与工程学院

摘要(Abstract)：

对采用熔融纺丝及热牵伸得到的左旋聚乳酸/右旋聚乳酸(PLLA/PDLA)牵伸丝在200℃下进行了不同时间的热处理,并对热处理前后PLLA/PDLA纤维热性能、结晶结构、表面形貌等进行了研究。结果表明:经过热处理后,DSC升温曲线中仅存在sc立构晶熔融峰;当热处理时间为1 min时,即可得到仅含sc立构晶的PLLA/PDLA纤维,随着热处理时间的延长,sc立构晶的熔融峰分峰现象有所减弱,结晶度及晶区取向度均有不同程度的提高,同时晶粒尺寸变小。SEM照片显示,经热处理后PLLA/PDLA纤维表面呈现不规则的突起。
In this paper, L-polylactic acid/D-polylactic acid(PLLA/PDLA) drawn fibers obtained by melt spinning and subsequent drawing were heat treated at 200 ℃ for different times. The thermal properties,crystal structure and surface morphology of PLLA/PDLA fibers before and after heat treatment were studied.The results show that only the melting peak of the stereotactic crystal(sc) esists in DSC curves. When the heat treatment time is 1 min, PLLA/PDLA fibers containing only the stereotactic crystal can be obtained.With the prolongation of heat treatment time, the trimodal phenomenon of the melting peak of the stereotactic crystal in the PLLA/PDLA fibers weakens, while the crystallinity and the degree of crystal orientation improve, and the grain size reduces. After heat treatment, the surface of PLLA/PDLA fiber shows irregular protrusions.

关键词(KeyWords)： 聚乳酸;结晶性能;立构复合;熔融纺丝;热处理
polylactic acid;crystallization property;stereocomplex;melt spinning;heat treatment

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划资助项目(编号2017YFB0309304)

作者(Author): 朱爽,韩克清,黄爽,孙旭鹏
ZHU Shuang,HAN Ke-qing,HUANG Shuang,SUN Xu-peng

DOI: 10.16090/j.cnki.hcxw.20190531.003

参考文献(References)：

• [1]TSUJI H.Poly(lactide)stereocomplexes:Formation,structure,properties,degradation,and applications[J].Macromolecular Bioscience,2007,7(12):1299-1299.
• [2]XU HJ,TANG SC,CHEN JD,et al.Thermal and phase-separation behavior of injection-molded poly(L-lactic acid)/poly(D-lactic acid)blends with moderate optical purity[J].Polymer Bulletin,2012,68(4):1135-1151.
• [3]陈璐,唐颂超,夏季,等.高耐热PLLA_PDLA共混物的热性能和结晶结构研究[J].高分子学报,2013(8):1006-1012.
• [4]LüTX,ZHOU CB,LI JQ,et al.New insight into the mechanism of enhanced crystallization of PLA in PLLA/PDLA mixture[J].Journal of Applied Polymer Science,2018,135(2):45663.