Toughness improvement of epoxy thermosets with cellulose nanocrystals,Polymer International

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Toughness improvement of epoxy thermosets with cellulose nanocrystals
Polymer International ( IF 2.9 ) Pub Date : 2021-05-22 , DOI: 10.1002/pi.6260
Xiulian Qin ₁ , Wenming Ge ₁ , Honggang Mei ₁ , Lei Li ₁ , Sixun Zheng ₁

Affiliation

We report the toughness improvement of epoxy thermosets by the use of cellulose nanocrystals (CNCs). Pristine CNCs were functionalized via surface-initiated reversible addition–fragmentation chain transfer/macromolecular design via interchange of xanthates (RAFT/MADIX) polymerization. The pristine CNCs were first surface-treated with 4-cyano-4-(isopropoxycarbonothioylthio)pentanoic chloride and then poly(N-vinylpyrrolidone)-grafted CNCs (CNC-PVPy) were synthesized with the xanthate-functionalized CNCs as chain transfer agent. Notably, the as-obtained CNC-PVPy can be dispersed into epoxy thermosets in the form of single fibrous nano-objects, i.e. the nanocomposites of epoxy with CNCs were successfully obtained. The uniform dispersion of CNCs in epoxy matrix is attributable to the compatibilizing effect of PVPy chains. The introduction of CNCs markedly improved the toughness of epoxy thermosets. When the mass fraction of CNC-PVPy was 30 wt%, the nanocomposites displayed the maximum critical stress intensity factor (K_1C) and critical fracture energy (G_1C) of 1.76 MN m^−3/2 and 0.66 kJ m⁻², respectively. The toughening of epoxy thermosets is mainly attributed to the plastic deformation of epoxy matrix, which is initiated from CNCs. © 2021 Society of Industrial Chemistry.

中文翻译：

用纤维素纳米晶体提高环氧树脂热固性材料的韧性

我们报告了通过使用纤维素纳米晶体 (CNC) 提高环氧树脂热固性材料的韧性。原始的 CNCs 通过表面引发的可逆加成 - 断裂链转移/大分子设计通过黄药交换 (RAFT/MADIX) 聚合进行功能化。原始的 CNCs 首先用 4-cyano-4-(isopropoxycarbonothioylthio)pentanoic chloride 表面处理，然后用聚（N-乙烯基吡咯烷酮）-接枝的CNCs（CNC-PVPy）以黄药功能化的CNCs作为链转移剂合成。值得注意的是，所获得的 CNC-PVPy 可以以单纤维纳米物体的形式分散到环氧树脂热固性树脂中，即成功获得环氧树脂与 CNCs 的纳米复合材料。CNCs 在环氧树脂基体中的均匀分散归因于 PVPy 链的增容作用。CNCs 的引入显着提高了环氧树脂热固性材料的韧性。当 CNC-PVPy 的质量分数为 30 wt% 时，纳米复合材料的最大临界应力强度因子 ( K _1C ) 和临界断裂能 ( G _1C ) 分别为 1.76 MN m ^-3/2和 0.66 kJ m ^-2，分别。环氧树脂热固性塑料的增韧主要归因于环氧树脂基体的塑性变形，这是由 CNC 引发的。© 2021 工业化学学会。

更新日期：2021-05-22

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