Facile and efficient formation of stereocomplex polylactide fibers drawn at low temperatures

被引：22

作者：

Huang, Wei ^{[1
]}

Shi, Yamin ^{[1
]}

Wang, Peng ^{[1
]}

Yang, Qiu ^{[5
]}

du Sart, Gerrit Gobius ^{[2
,3
]}

Zhou, Yuxiang ^{[3
]}

Joziasse, Cornelis A. P. ^{[1
,2
,4
]}

Wang, Ruyin ^{[3
]}

Chen, Peng ^{[1
,4
]}

机构：

[1] Chinese Acad Sci, Zhejiang Key Lab Biobased Polymer Mat Technol & Ap, Ningbo Key Lab Polymer Mat, Ningbo Inst Mat Technol & Engn NIMTE, Ningbo 315201, Peoples R China

[2] TotalEnergies Corb, Stadhuispl 70, NL-4203 NS Gorinchem, Netherlands

[3] TotalEnergies Corb China, Room 3801, Raffles City, 268 Middle Xizang Rd, Shanghai 200001, Peoples R China

[4] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

[5] Ningbo New Mat Testing & Evaluat Ctr Co Ltd, Ningbo 315201, Peoples R China

来源：

POLYMER | 2022年 / 246卷

基金：

国家重点研发计划;

关键词：

Stereocomplex polylactide; In-situ reactive melt-spinning; Transesterification reaction; Stereo-block PLA copolymer; Industrial-scale; ENANTIOMERIC POLY(LACTIC ACID)S; MOLECULAR-WEIGHT; CRYSTALLIZATION BEHAVIOR; POLY(L-LACTIC ACID); CRYSTAL-STRUCTURE; MELT STABILITY; POLY(D-LACTIDE); BLENDS; TRANSITION; MORPHOLOGY;

D O I：

10.1016/j.polymer.2022.124743

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Stereocomplex polylactide (SC-PLA) provides an effective route to improve heat-resistance through the formation of SC-PLA crystallites driven by hydrogen bonding interactions between poly(L-lactide) (PLLA) and poly(D-lac-tide) (PDLA). Great progress has been made in low molecular-weight SC-PLA compounds. However, the development of strategies for exclusive stereocomplexation in high molecular-weight (high-MW) PLLA/PDLA racemic blends quenched from isotropic melt remains challenging. In this study, in-situ reactive melt-spinning of commercially available high-MW PLLA/PDLA blend with a new transesterification catalyst (i.e., sodium octanoate in MB) was devised as an effective strategy to prepare blends containing stereo-block PLA (sb-PLA) copolymers. As a result, the sb-PLA copolymers restricted phase separation and further promoted relatively weak CH3 ... O=C hydrogen bonding interactions, along with the development of the exclusive SC-PLA crystallites with low crystalline thickness (L-c) in PLLA/PDLA/MB blend fibers drawn at low temperatures (<= 102 degrees C). In contrast, extremely limited transesterification reaction in PLLA/PDLA melt led to the phase separation and the resultant separate domains of PLLA or PDLA restricted the occurrence of the CH3? O=C hydrogen bonding interactions in the PLLA/PDLA blend fibers drawn at low temperatures (<= 120 degrees C). Only when the PLLA/PDLA blend fibers were drawn at a high temperature (198 degrees C), the strong CH3 ... O=C hydrogen bonding interactions could be formed, along with the formation of the exclusive SC-PLA crystallites with high Lc. These findings provide a facile and effective strategy to develop industrial-scale PLA fibers containing the exclusive SC-PLA crystallites with improved heat-resistance.

引用

页数：11

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