全纤维素自增强复合材料的制备与研究
发布时间：2019-06-20 12:49
【摘要】：全纤维素自增强复合材料(SRACCs)是基于同时将纤维素作为基体材料和增强材料的复合材料。由于基体材料与增强材料均为纤维素,两者具有很高的界面相容性。因此,全纤维素自增强复合材料不仅具有优越的力学性能,还是一种能够完全降解的环境友好材料。这个对于解决复合材料的回收处理问题有着重要意义。本文选取了汉麻织物和水曲柳两种天然纤维,分别以BMIMCl将其部分溶解,然后热压制备得到全纤维素自增强复合材料。借助红外、光学显微镜、XRD、SEM、拉伸测试等表征手段对其进行测试分析。研究了全纤维素自增强复合材料的结晶度指数、微观形貌和力学性能。研究结果如下：1、对SRACCs进行测试分析,发现相对于汉麻织物,SRACCs的结晶度指数上升；微观表面变光滑,纤维之间空隙基本消失；拉伸强度上升；TG中的热降解行为转变为二阶降解,残炭量明显上升。当热压压力为10MPa,热压时间为10min,热压温度为120℃时,SRACCs的拉伸强度达到77.9MPa,拉伸强度提升了31%,残炭量从8.5%提升至12.9%。2、对SRAWCs进行测试分析,发现相对于水曲柳,SRAWCs的结晶度指数上升：微观表面缺陷被填充,纤维之间空隙消失；拉伸强度明显上升；TG中的热降解行为转变为二阶降解,残炭量明显上升。当热压压力为10MPa,热压时间为30min,热压温度为190℃时,SRAWCs的拉伸强度达到212.6MPa,拉伸强度提升了239%,残炭量从19.7%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，
本文编号：2503232
[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，
本文编号：2503232
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