聚乳酸-聚己内酯多嵌段立构复合物薄膜的制备及熔融稳定性  

Preparation and Melt Stability of PLA-PCL Multi-block Stereocomplex Film

作　　者：常悦 陈支泽 杨一奇[3] CHANG Yue;CHEN Zhize;YANG Yiqi(Key Laboratory of Science and Technology of Eco-textile of Ministry of Education,Shanghai 201620;College of Chemistry,Chemical Engineering and Biochemistry,Donghua University,Shanghai 201620;Department of Biological Systems Engineering and Nebraska Center for Materials and Nanoscience,HECO Building,University of Nebraska-Lincoln,Lincoln NE 68583-0802,United States)

机构地区：[1]生态纺织教育部重点实验室,上海201620 [2]东华大学化学化工与生物工程学院,上海201620 [3]美国内布拉斯加-林肯大学生物系统工程系和材料与纳米科学研究中心,内布拉斯加-林肯NE68583-0802

出　　处：《材料导报》2019年第16期2808-2812,共5页Materials Reports

基　　金：国家自然科学基金青年基金(51503029)~~

摘　　要：作为传统塑料薄膜的替代品,环境友好的聚乳酸(PLA)薄膜在众多领域得到广泛应用。然而,PLA自身存在缺陷,特别是其在加工过程中易发生降解,极大地增加了PLA薄膜的加工难度。为了提高聚乳酸立构复合物(sc-PLA)的韧性和熔体稳定性,使用D,L-丙交酯和聚(ε-己内酯)二醇(PCL)合成了具有相同分子量的聚乳酸多嵌段共聚物对映体,将对映体均匀混合后热压制备立构复合物薄膜(sc-PLCL/PDCD)。差示扫描量热仪(DSC)测试结果显示,该立构复合物表现出良好的熔体稳定性,重结晶后立构晶体回复率在97%以上。广角X射线多晶衍射(WXRD)测试证明热压薄膜中只存在立构晶体。同时,通过该方法可以将各种二醇柔性链段引入PLA手性分子链中以快速制备具有优良拉伸性能和熔体稳定性的PLA立构复合物材料,以达到适用于熔体加工的目的。The environmentally friendly polylactic acid(PLA)film is widely applied in diverse sectors as a substitute of the traditional plastic film.Howe-ver,there are intrinsic flaws in PLA,especially its great possibility to degrade during processing,which make the processing of PLA difficult.For the sake of enhancing the toughness and melt stability of polylactic acid stereocomplex(sc-PLA),the enantiomers of PLA multi-block copolymers with the same molecular weight were synthesized,taking L-lactide,D-lactide and poly(ε-caprolactone)diol(PCL-diOH)as raw materials.Then,the stereocomplex films of the multi-block copolymers(sc-PLCL/PDCD)were prepared by hot-press molding after uniformly mixing the enantiomers.The results of differential scanning calorimeter(DSC)indicated that the sc-PLCL/PDCD exhibited satisfactory melting stability,and the recovery rate of stereo-crystallites after recrystallization exceeded 97%.The test of wide angle X-ray polycrystalline diffraction(WXRD)de-monstrated that only stereo-crystallites existed in the hot pressed film.Besides,the stereocomplex film prepared by this approach was capable of introducing various flexible segments with diol end groups into the PLA chiral molecular chain,so as to rapidly prepare sc-PLA with excellent tensile properties and melting stability,being adapted to melting processing.

关 键 词：聚乳酸立构复合物 熔融稳定性 增韧改性 多嵌段共聚 

分 类 号：O632[理学—高分子化学]