Unravelling the role of poly(methyl methacrylate) (PMMA) molecular weight in poly(vinylidene fluoride) (PVDF)/PMMA/Expanded graphite (ExGr) blend nanocomposites: Insights into morphology, thermal behavior, electrical conductivity, and wetting property

IF 3.6 4区材料科学 Q2 MATERIALS SCIENCE, COMPOSITES

Journal of Thermoplastic Composite Materials Pub Date : 2024-03-27 DOI:10.1177/08927057241238203

Nikhitha Augustin, Pranesh Muraliharan, Aleena Sabu, Kanya Koothanatham Senthilkumar, Pratheep Kumar Annamalai, Ramanujam Brahmadesam Thoopul Srinivasa Raghava

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引用次数: 0

Abstract

Poly(vinylidene fluoride) (PVDF) based conducting polymer composites with carbon nanomaterials can be used for mechanical energy harvesting through piezoelectric or triboelectric effect. This study aims to investigate the influence of PMMA molecular weight on the electrical, thermal, and wetting properties of PVDF/40 wt.% PMMA blend nanocomposites reinforced with expanded graphite (ExGr). The blend nanocomposites with 40 wt.% PMMA have been prepared by solution blending method by using two different molecular weights of PMMA whose melt flow indices are 2 g/10 min and 2.3 g/10 min. The coexistence of the electroactive gamma and non-polar alpha phases of PVDF in the blend nanocomposites has been confirmed by X-ray diffraction, Fourier transform infrared spectroscopy and differential scanning calorimetry analyses. While overall crystallinity (%) of low molecular weight PMMA employed blend nanocomposites is lower than that of high molecular weight PMMA blended nanocomposites, the electroactive gamma phase has been found to increase in the former blend nanocomposites. The dispersion of graphite nanosheets has been observed to be better in high molecular weight PMMA employed blend nanocomposites which results in higher electrical conductivity. Impedance analysis of PVDF-40 wt.% PMMA-2 wt.% ExGr blend nanocomposite with high molecular weight PMMA results in enhanced interjunction capacitance (74.5 pF) in comparison to low molecular weight PMMA mixed blend nanocomposites (68 pF). Water contact angle (WCA) increases with molecular weight of PMMA and ExGr loading level. Thermogravimetric analysis has shown that the char content (above 500°C) is slightly higher for the blend with low molecular weight PMMA than with high molecular weight PMMA.

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揭示聚偏二氟乙烯（PVDF）/聚甲基丙烯酸甲酯（PMMA）/膨胀石墨（ExGr）共混纳米复合材料中聚甲基丙烯酸甲酯（PMMA）分子量的作用：对形态、热行为、导电性和润湿性能的见解

基于聚偏二氟乙烯（PVDF）与碳纳米材料的导电聚合物复合材料可通过压电效应或三电效应用于机械能收集。本研究旨在探讨 PMMA 分子量对以膨胀石墨（ExGr）增强的 PVDF/40 wt.% PMMA 共混纳米复合材料的电学、热学和润湿性能的影响。使用两种不同分子量的 PMMA（熔体流动指数分别为 2 g/10 min 和 2.3 g/10 min），通过溶液混合法制备了含 40 wt.% PMMA 的共混纳米复合材料。通过 X 射线衍射、傅立叶变换红外光谱和差示扫描量热分析，证实了混合纳米复合材料中 PVDF 的电活性γ相和非极性α相共存。虽然低分子量 PMMA 混合纳米复合材料的总体结晶度（%）低于高分子量 PMMA 混合纳米复合材料，但发现前者混合纳米复合材料中的电活性伽马相有所增加。据观察，在高分子量 PMMA 混合纳米复合材料中，石墨纳米片的分散性更好，因此导电性更高。与低分子量 PMMA 混合纳米复合材料（68 pF）相比，PVDF-40 wt.% PMMA-2 wt.% ExGr 与高分子量 PMMA 混合纳米复合材料的阻抗分析结果表明，交界电容（74.5 pF）有所提高。水接触角（WCA）随 PMMA 的分子量和 ExGr 含量的增加而增大。热重分析表明，与高分子量 PMMA 相比，低分子量 PMMA 混合纳米复合材料的炭含量（高于 500°C）略高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Thermoplastic Composite Materials 工程技术-材料科学：复合

CiteScore

8.00

自引率

18.20%

发文量

104

审稿时长

5.9 months

期刊介绍： The Journal of Thermoplastic Composite Materials is a fully peer-reviewed international journal that publishes original research and review articles on polymers, nanocomposites, and particulate-, discontinuous-, and continuous-fiber-reinforced materials in the areas of processing, materials science, mechanics, durability, design, non destructive evaluation and manufacturing science. This journal is a member of the Committee on Publication Ethics (COPE).