【摘要】：全纖維素自增強復(fù)合材料(SRACCs)是基于同時將纖維素作為基體材料和增強材料的復(fù)合材料。由于基體材料與增強材料均為纖維素,兩者具有很高的界面相容性。因此,全纖維素自增強復(fù)合材料不僅具有優(yōu)越的力學(xué)性能,還是一種能夠完全降解的環(huán)境友好材料。這個對于解決復(fù)合材料的回收處理問題有著重要意義。本文選取了漢麻織物和水曲柳兩種天然纖維,分別以BMIMCl將其部分溶解,然后熱壓制備得到全纖維素自增強復(fù)合材料。借助紅外、光學(xué)顯微鏡、XRD、SEM、拉伸測試等表征手段對其進行測試分析。研究了全纖維素自增強復(fù)合材料的結(jié)晶度指數(shù)、微觀形貌和力學(xué)性能。研究結(jié)果如下：1、對SRACCs進行測試分析,發(fā)現(xiàn)相對于漢麻織物,SRACCs的結(jié)晶度指數(shù)上升；微觀表面變光滑,纖維之間空隙基本消失；拉伸強度上升；TG中的熱降解行為轉(zhuǎn)變?yōu)槎A降解,殘?zhí)苛棵黠@上升。當(dāng)熱壓壓力為10MPa,熱壓時間為10min,熱壓溫度為120℃時,SRACCs的拉伸強度達到77.9MPa,拉伸強度提升了31%,殘?zhí)苛繌?.5%提升至12.9%。2、對SRAWCs進行測試分析,發(fā)現(xiàn)相對于水曲柳,SRAWCs的結(jié)晶度指數(shù)上升：微觀表面缺陷被填充,纖維之間空隙消失；拉伸強度明顯上升；TG中的熱降解行為轉(zhuǎn)變?yōu)槎A降解,殘?zhí)苛棵黠@上升。當(dāng)熱壓壓力為10MPa,熱壓時間為30min,熱壓溫度為190℃時,SRAWCs的拉伸強度達到212.6MPa,拉伸強度提升了239%,殘?zhí)苛繌?9.7%上升至24.9%。
[Abstract]:The whole cellulose self-reinforcing composite (SRACCs) is based on the composite material which uses cellulose as the matrix material and the reinforcement material at the same time. Because the matrix material and the reinforcing material are cellulose, they have high interfacial compatibility. Therefore, the all-cellulose self-reinforcing composites not only have superior mechanical properties, but also a kind of environmentally friendly materials which can be completely degraded. This is of great significance to solve the problem of recovery and treatment of composite materials. In this paper, two kinds of natural fibers, hemp fabric and Fraxinus mandshurica, were selected and partially dissolved by BMIMCl, and then the whole cellulose self-reinforcing composites were prepared by hot pressing. Infrared, optical microscope, XRD,SEM, tensile test and other characterization methods were used to test and analyze it. The crystallization index, microstructure and mechanical properties of all cellulose self-reinforcing composites were studied. The results are as follows: 1. Compared with hemp fabric, the crystallinity index of SRACCs increased, the microsurface became smooth, the gap between fibers basically disappeared, the tensile strength increased, and the thermal degradation behavior in TG changed to second-order degradation, and the amount of residual carbon increased obviously. When the hot pressing pressure is 10 MPA, the hot pressing time is 10 min, and the hot pressing temperature is 120 鈩，

本文編號：2503232