离子液体接枝PA6增容的PVDF/PA6共混物的结构和性能,ACS Omega

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离子液体接枝PA6增容的PVDF/PA6共混物的结构和性能
ACS Omega ( IF 3.7 ) Pub Date : 2022-04-08 , DOI: 10.1021/acsomega.1c07341
Xin Zheng _{1,

2} , Yongjin Li ₂ , Juntao Tang ₁ , Guipeng Yu ₁

Affiliation

不混溶混合物的相容性对于开发高性能聚合物材料至关重要。在这项工作中，离子液体，1-乙烯基-3-丁基咪唑氯化物，具有准嵌段结构的接枝聚酰胺6（PA6-g-IL（Cl））被用作不混溶聚（偏二氟乙烯）的增容剂(PVDF)/PA6 混合物。系统研究了两种 PA6-g-IL(Cl)s（E-2%-50K 和 E-8%-50K）对 PVDF/PA6 共混物的形貌、结晶行为、力学性能和表面电阻的影响. 发现两种类型的 PA6-g-IL(Cl)s 对 PVDF/PA6 共混物具有良好的增容效果。具体来说，PVDF/PA6 = 60/40共混物在加入E-8%-50K和高接枝度（DG）后，其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共混物的抗拉强度达到66 MPa，高于PVDF、PA6和PVDF/PA6共混物。此外，PVDF/PA6/E-8%-50K 共混物由于双连续结构提供的导电路径和接枝 IL(Cl) 提供的导电离子而表现出表面导电性。差示扫描量热法 (DSC) 和广角 X 射线衍射 (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。相容机制的结论是基于未接枝的 PA6 嵌段与 PA6 链缠结，而离子液体接枝的 PA6 嵌段与 PVDF 链相互作用。这项工作为不混溶的聚合物共混物的增容提供了新的策略。

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

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.

更新日期：2022-04-08

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