Surface modified microfibrillated cellulose-poly(vinylidene fluoride) composites: β-phase formation, viscoelastic and dielectric performance,Polymer International

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Surface modified microfibrillated cellulose-poly(vinylidene fluoride) composites: β-phase formation, viscoelastic and dielectric performance
Polymer International ( IF 2.9 ) Pub Date : 2021-02-07 , DOI: 10.1002/pi.6202
Mohammed Arif Poothanari ₁ , Véronique Michaud ₁ , Dragan Damjanovic ₂ , Yves Leterrier ₁

Affiliation

The effect of silylation of microfibrillated cellulose (MFC) surfaces on β-phase formation in poly(vinylidene difluoride) (PVDF) and the resulting viscoelastic and dielectric performance of MFC-PVDF composites is investigated. Two different organosilanes, namely aminated (A) and fluorinated (F), were used. Composites of PVDF and MFC at concentrations up to 10 wt%, both untreated and silylated, were prepared by solvent casting. The two different surface modifications did not markedly change the melting and crystallization enthalpy of the polymer. However, only A-MFC was found to promote β-phase compared to the untreated MFC and the F-MFC, which was attributed to the formation of hydrogen bonds at the interface between the amine groups of A-MFC and the fluorine groups of PVDF. The elastic modulus and the permittivity of all composites increased with the amount of MFC up to a maximum value, depending on the MFC modification, and then decreased. This effect was due to the formation of MFC aggregates and porosity, as further confirmed by a comparison of experimental moduli with a classical composite mechanical model. The highest elastic modulus and highest permittivity were obtained for the untreated MFC and A-MFC composites with 5 and 1 wt%. © 2021 Society of Chemical Industry

中文翻译：

表面改性微纤化纤维素-聚偏二氟乙烯复合材料：β相形成、粘弹性和介电性能

研究了微纤化纤维素 (MFC) 表面的硅烷化对聚偏二氟乙烯 (PVDF) 中 β 相形成的影响以及 MFC-PVDF 复合材料的粘弹性和介电性能。使用了两种不同的有机硅烷，即胺化 (A) 和氟化 (F)。PVDF 和 MFC 的复合材料浓度高达 10 wt%，未经处理和硅烷化，通过溶剂浇铸制备。两种不同的表面改性并未显着改变聚合物的熔融和结晶焓。然而，与未处理的 MFC 和 F-MFC 相比，只有 A-MFC 被发现促进了 β 相，这归因于在 A-MFC 的胺基团和 PVDF 的氟基团之间的界面处形成氢键. 所有复合材料的弹性模量和介电常数都随着 MFC 的量增加，达到最大值，取决于 MFC 的改性，然后下降。这种效应是由于 MFC 聚集体和孔隙率的形成，正如实验模量与经典复合力学模型的比较所进一步证实的。未处理的 MFC 和 A-MFC 复合材料的弹性模量和介电常数最高，分别为 5% 和 1%。© 2021 化学工业协会未处理的 MFC 和 A-MFC 复合材料的弹性模量和介电常数最高，分别为 5% 和 1%。© 2021 化学工业协会未处理的 MFC 和 A-MFC 复合材料的弹性模量和介电常数最高，分别为 5% 和 1%。© 2021 化学工业协会

更新日期：2021-02-07

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