Zhang Liyue, Liu Jingkai, Dai Jinyue, Zhang Xufeng, Liu Xiaoling, Liu Xiaoqing, Yi Xiaosu
New Material Institute, University of Nottingham Ningbo China, Ningbo 315100, China.
Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
Polymers (Basel). 2023 Sep 18;15(18):3800. doi: 10.3390/polym15183800.
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.
一种能够同时提高机械性能和热性能的多功能改性剂在复合材料生产中具有重要意义。在此，受贻贝化学的启发，通过一个简单步骤设计并合成了一种名为FPD的界面改性剂，它带有三个官能团（包括邻苯二酚、N-H键和DOPO）。由于每个官能团的固有特性，FPD发挥了多种作用：通过邻苯二酚与苎麻纤维粘附，并通过-NH-与环氧树脂固化，DOPO赋予其阻燃性能，并且通过改变苎麻纤维的极性还提高了苎麻纤维与环氧树脂之间的相容性。上述所有功能均可通过水接触角（WCA）、原子力显微镜（AFM）和扫描电子显微镜（SEM）等手段得到证明。固化后，苎麻纤维/环氧树脂复合材料在机械性能良好和阻燃性能优异方面表现出卓越的性能。添加30 wt.%的FPD后，苎麻/环氧树脂复合材料的拉伸强度和模量分别提高了37.1%和60.9%，与未添加的复合材料相比，复合材料的弯曲强度和模量分别提高了8.9%和19.3%。此外，当FPD的添加量达到30 wt.%时，该复合材料在UL-94测试中可达到V-0等级，极限氧指数值为34.6%。这项工作为我们提供了一种制备具有良好性能的天然纤维/环氧树脂复合材料的有效方法。
