Reactive Compatibilization: Formation of Double-Grafted Copolymers by In Situ Binary Grafting and Their Compatibilization Effect,ACS Applied Materials & Interfaces

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Reactive Compatibilization: Formation of Double-Grafted Copolymers by In Situ Binary Grafting and Their Compatibilization Effect
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-18 00:00:00 , DOI: 10.1021/acsami.7b08699
Depei Chen ₁ , Hengti Wang ₁ , Yongjin Li ₁

Affiliation

Reactive compatibilizers are usually used to enhance the compatibility of immiscible polymer blends. However, reactive linear compatibilizers containing reactive groups on the main chains form graft copolymers during reactive blending, and such graft copolymers with an asymmetric molecular structure are often “pulled in” or “pulled out” under mechanical shear. Double-grafted compatibilizers have a symmetric structure, and they usually exhibit higher compatibilizing efficiency. In this work, we propose a binary grafting strategy during melt blending to form compatibilizers located at the interface of an immiscible polymer blend. Specifically, poly(methyl methacrylate) (PMMA) oligomer with carboxylic end groups (PMMA–COOH) and poly(styrene-co-glycidyl methacrylate) (SG) copolymer were simultaneously incorporated into immiscible poly(vinylidene fluoride)/poly(l-lactic acid) (PVDF/PLLA) blends. The carboxylic acid groups of both the PMMA oligomer and PLLA can react with the epoxide groups on the SG main chains. Therefore, novel compatibilizing polymers with both PMMA and PLLA chains grafted onto the SG main chains form in situ. The grafted PMMA chains can entangle with PVDF, and the grafted PLLA chains are embedded in the PLLA phase, so the double-grafted copolymers act as effective compatibilizers for the PVDF/PLLA blends. Moreover, the effects of the PMMA molecular weight and PMMA loading (number of grafted PMMA side chains) on the compatibilization efficiency were investigated. The compatibilizing efficiency increases with increasing molecular weight and number of side chains in the ranges considered in this study. This one-pot synthesis of double-grafted compatibilizers by in situ grafting provides a new and simple method to prepare double-comb compatibilizers, and it offers the possibility of high-efficiency compatibilization.

中文翻译：

反应性增容：通过原位二元接枝形成双接枝共聚物及其增容作用

反应性增容剂通常用于增强不混溶的聚合物共混物的相容性。然而，在主链上含有反应性基团的反应性线性增容剂在反应性共混期间形成接枝共聚物，并且这种具有不对称分子结构的接枝共聚物通常在机械剪切作用下被“拉入”或“拉出”。双接枝增容剂具有对称结构，它们通常表现出较高的增容效率。在这项工作中，我们提出了在熔融共混过程中形成相容剂的二元接枝策略，该增容剂位于不混溶的聚合物共混物的界面上。特别是具有羧基端基（PMMA–COOH）的聚（甲基丙烯酸甲酯）（PMMA）低聚物和聚（苯乙烯）共聚物-甲基丙烯酸缩水甘油酯（SG）共聚物同时掺入不混溶的聚偏二氟乙烯/聚（l-乳酸）（PVDF / PLLA）混合物。PMMA低聚物和PLLA的羧酸基团都可以与SG主链上的环氧基团反应。因此，具有PMMA和PLLA链均接枝到SG主链上的新型相容聚合物原位形成。接枝的PMMA链可以与PVDF缠结，并且接枝的PLLA链嵌入PLLA相中，因此双接枝共聚物可作为PVDF / PLLA共混物的有效相容剂。此外，研究了PMMA的分子量和PMMA的负载量（接枝的PMMA侧链的数量）对增容效率的影响。在本研究中考虑的范围内，增容效率随分子量和侧链数量的增加而增加。

更新日期：2017-09-18

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