Preparation and Application of a Multifunctional Interfacial Modifier for Ramie Fiber/Epoxy Resin Composites

Polymers (Basel). 2023 Sep 18;15(18):3800. doi: 10.3390/polym15183800.

Abstract

A multi-functional modifier, which could improve the mechanical and thermal performance simultaneously, is significant in composites production. Herein, inspired by the chemistry of mussel, an interfacial modifier named FPD was designed and synthesized through one simple step, which was attached by three functional groups (including catechol, N-H bond, and DOPO). Due to the innate properties of each functional group, FPD played multiple roles: adhere to the ramie fibers from catechol and cure with the epoxy resin from -NH-, an antiflaming property from DOPO, and the compatibilizer between ramie fibers and epoxy resin was also improved by changing the polarity of ramie fiber. All of the above functions can be proved by means of water contact angle (WCA), atomic force microscope (AFM), and scanning electron microscopy (SEM), etc. After solidification, the ramie fiber/epoxy composites demonstrated superior performances in terms of good mechanical properties and excellent flame retardant property. With the addition of 30 wt.% FPD, the tensile strength and modulus of the ramie/epoxy composite showed an improvement of 37.1% and 60.9%, and flexural strength and modulus of the composite were improved by 8.9% and 19.3% comparing with no addition composite. Moreover, the composite could achieve the goal for V-0 rating in the UL-94 test and LOI value was 34.6% when the addition of FPD reached 30 wt.%. This work provided us with an efficient method for fabricating nature fiber/epoxy composites with good properties.

Keywords: epoxy resin composites; flame retardant; interfacial properties; mussel-inspired; ramie fiber.

Grants and funding

This research was funded by the National Natural Science Foundation of China (U1909220, 52003283), Ningbo 2025 Key Scientific Research Programs (2022Z111, 2022Z160, 2022Z198), Natural Science Foundation of Ningbo City (2022J302), China Postdoctoral Science Foundation (2022M723250), The Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang (Grant No. 2021R01005).