基于快速硅氧烷交换的间苯二酚衍生型可动玻璃和其亚麻纤维增强复合材料。

Resorcinol-Derived Vitrimers and Their Flax Fiber-Reinforced Composites Based on Fast Siloxane Exchange.

机构信息

Polymer Chemistry Research Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University, Ghent, B-9000, Belgium.

Department of Materials, Textiles and Chemical Engineering, Mechanics of Materials and Structures, Ghent University, Technologiepark 46, Zwijnaarde, 9052, Belgium.

出版信息

Macromol Rapid Commun. 2023 Apr;44(8):e2300020. doi: 10.1002/marc.202300020. Epub 2023 Mar 10.

DOI:10.1002/marc.202300020

PMID:36840963

Abstract

Natural fiber-reinforced composites are gaining increased interest for their significantly reduced carbon footprint compared to conventional glass or carbon fiber-based counterparts. In this study, natural fibers are used in a resorcinol-based epoxy resin that is thermally reshapable at higher temperatures (>180 °C) by using fast exchanging siloxane bonds, catalyzed by 1,5,7-triazabicyclo[4.4.0]dec-5-ene. Stress relaxation times of only about 6 s at 220 °C can be reached. A resorcinol-based epoxy compound is selected because it can be derived from cellulose, opening ways for more sustainable and reshapable composite materials. In a last step of the research, the low viscosity vitrimer formulation (<200 mPa s) is applied to make a flax fiber-reinforced composite using an industrially relevant vacuum-assisted resin infusion process. A section of this composite is successfully reshaped, which allows for envisioning a second life for natural fiber-reinforced composites.

摘要

与传统的玻璃纤维或碳纤维基复合材料相比，天然纤维增强复合材料的碳足迹显著降低，因此越来越受到关注。在这项研究中，天然纤维被用于一种基于间苯二酚的环氧树脂中，该树脂在较高温度（>180°C）下可通过使用快速交换的硅氧烷键进行热重塑，由 1,5,7-三氮杂二环[4.4.0]癸-5-烯催化。在 220°C 时，仅需约 6s 即可达到应力松弛时间。选择基于间苯二酚的环氧树脂化合物是因为它可以从纤维素中获得，为更可持续和可重塑的复合材料开辟了道路。在研究的最后一步，低粘度的 vitrimer 配方（<200 mPa·s）被用于使用工业相关的真空辅助树脂灌注工艺制造亚麻纤维增强复合材料。该复合材料的一部分成功地进行了重塑，这使得人们可以设想天然纤维增强复合材料的第二次生命。