文献类型：期刊文献

英文题名：Electrospun membranes of low molecular weight di-stereoblock poly(lactic acid)s with high thermal stability and solvent resistance via low temperature sintering

作者：Chen, Tao[1,3,5,6];Xu, Mengfan[1,3];Zhao, Liming[2,4,5,6];Wang, Lejun[5,6];Qiu, Yongjun[2,4,5,6]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Biotechnol, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]Shanghai Key Lab Adv Polymer Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;[4]Ease China Univ Sci & Technol, State Key Lab Bioreactor Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[5]China Natl Light Ind, Key Lab Biobased Mat Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[6]ECUST HITECH Biobased Mat Res Inst, 339 Fourth Binhai Rd, Ningbo 315336, Peoples R China

年份：2020

卷号：55

期号：27

起止页码：13472

外文期刊名：JOURNAL OF MATERIALS SCIENCE

收录：;EI(收录号：20202608869200);WOS:【SCI-EXPANDED(收录号:WOS:000542526000005)】；

基金：This study was financially supported by the National Key Research and Development Program of China (2017YFB0309301, 2017YFB0309302) and the Natural Science Foundation of Shanghai, China (17ZR1407200).

语种：英文

外文关键词：Temperature - Tensile strength - Binding energy - Molecular weight - Thermodynamic stability - Complexation - Electrospinning - Crystallites - Sintering - Lactic acid

摘要：Electrospinning is a highly efficient mild method to obtain stereocomplex poly(lactic acid) fibers from blends of high molecular weight (MW) poly(L-lactic acid) (PLLA) and poly(D-lactic acid) (PDLA). However, high MW PLAs are expensive and proved difficult to avoid homocrystallites which weaken the performances. Here, di-stereoblock poly(lactic acid)s (di-sb-PLAs) with low MW of 10(4) g mol(-1)were synthesized and electrospun into membranes. The stereocomplex (sc) crystallites were induced by sintering the amorphous as-spun membranes at 200 degrees C, and further improved by applying 1 MPa pressure which promoted the segment migration across fiber intersections and welded the fibers by forming new sc crystallites. Due to more readily crystallize at molecular level than the blend of PLLA and PDLA, the sintered di-sb-PLA membranes exhibited higher thermal stability, better tensile strength, and were more stable during multiple cycles of selective separating solvent and water mixtures. Increasing MW of di-sb-PLA positively affected the membrane properties and inhibited dramatical embrittlement that occurred in sintered membrane of PLLA and PDLA blend.