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Journal of Materials Science

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23-06-2020 | Polymers & biopolymers

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

Authors: Tao Chen, Mengfan Xu, Liming Zhao, Lejun Wang, Yongjun Qiu

Published in: Journal of Materials Science | Issue 27/2020

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Abstract

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 10⁴ g mol⁻¹ were synthesized and electrospun into membranes. The stereocomplex (sc) crystallites were induced by sintering the amorphous as-spun membranes at 200 °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.

previous article Experimental characterisation and modelling of mechanical behaviour of microcapsules

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Title: Electrospun membranes of low molecular weight di-stereoblock poly(lactic acid)s with high thermal stability and solvent resistance via low temperature sintering
Authors: Tao Chen
Mengfan Xu
Liming Zhao
Lejun Wang
Yongjun Qiu
Publication date: 23-06-2020
Publisher: Springer US
Published in: Journal of Materials Science / Issue 27/2020
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-020-04987-8

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