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离子液体接枝聚酰胺6增容的聚偏氟乙烯/聚酰胺6共混物的结构与性能

Structure and Properties of PVDF/PA6 Blends Compatibilized by Ionic Liquid-Grafted PA6.

作者信息

Zheng Xin, Li Yongjin, Tang Juntao, Yu Guipeng

机构信息

College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People's Republic of China.

Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, Zhejiang, People's Republic of China.

出版信息

ACS Omega. 2022 Apr 8;7(15):12772-12778. doi: 10.1021/acsomega.1c07341. eCollection 2022 Apr 19.

Abstract

Compatibilization of immiscible blends is critically important for developing high-performance polymer materials. In this work, an ionic liquid, 1-vinyl-3-butyl imidazole chloride, grafted polyamide 6 (PA6-g-IL(Cl)) with a quasi-block structure was used as a compatibilizer for an immiscible poly(vinylidene fluoride) (PVDF)/PA6 blend. The effects of two PA6-g-IL(Cl)s (E-2%-50K and E-8%-50K) on the morphology, crystallization behavior, mechanical properties, and surface resistance of the PVDF/PA6 blend were investigated systematically. It was found that the two types of PA6-g-IL(Cl)s had a favorable compatibilization effect on the PVDF/PA6 blend. Specifically, the morphology of the PVDF/PA6 = 60/40 blend transformed from a typical sea-island into a bicontinuous structure after incorporating E-8%-50K with a high degree of grafting (DG). In addition, the tensile strength of the PVDF/PA6/E-8%-50K blend reached 66 MPa, which is higher than that of PVDF, PA6 and the PVDF/PA6 blend. Moreover, the PVDF/PA6/E-8%-50K blend exhibited surface conductivity due to the conductive path offered by the bicontinuous structure and conductive ions offered by grafted IL(Cl). Differential scanning calorimetry (DSC) and wide-angle X-ray diffractometry (WAXD) results revealed that PA6-g-IL(Cl) exhibits different effects on the crystallization behavior of PVDF and PA6. The compatibilization mechanism was concluded to be based on the fact that the nongrafted PA6 blocks entangled with the PA6 chains, while the ionic liquid-grafted PA6 blocks interacted with the PVDF chains. This work offers a new strategy for the compatibilization of immiscible polymer blends.

摘要

对于开发高性能聚合物材料而言,不相容共混物的增容至关重要。在本工作中,一种具有准嵌段结构的离子液体接枝聚酰胺6(PA6-g-IL(Cl)),即1-乙烯基-3-丁基咪唑氯盐,被用作不相容聚偏氟乙烯(PVDF)/PA6共混物的增容剂。系统研究了两种PA6-g-IL(Cl)(E-2%-50K和E-8%-50K)对PVDF/PA6共混物的形态、结晶行为、力学性能和表面电阻的影响。结果发现,这两种类型的PA6-g-IL(Cl)对PVDF/PA6共混物具有良好的增容效果。具体而言,在加入具有高接枝度(DG)的E-8%-50K后,PVDF/PA6 = 60/40共混物的形态从典型的海岛结构转变为双连续结构。此外,PVDF/PA6/E-8%-50K共混物的拉伸强度达到66 MPa,高于PVDF、PA6以及PVDF/PA6共混物。而且,由于双连续结构提供的导电路径和接枝的IL(Cl)提供的导电离子,PVDF/PA6/E-8%-50K共混物表现出表面导电性。差示扫描量热法(DSC)和广角X射线衍射法(WAXD)结果表明,PA6-g-IL(Cl)对PVDF和PA6的结晶行为表现出不同的影响。增容机理被认为是基于未接枝的PA6链段与PA6链缠结,而离子液体接枝的PA6链段与PVDF链相互作用这一事实。本工作为不相容聚合物共混物的增容提供了一种新策略。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/344a/9025987/5bbe9a3553be/ao1c07341_0002.jpg

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