纤维增强衣康酸基生物环氧树脂复合材料界面性能研究

发布时间：2018-01-22 18:41

本文关键词： 衣康酸环氧树脂复合材料界面性能纤维素纳米纤维纤维素纳米晶　出处：《北京化工大学》2015年硕士论文　论文类型：学位论文

【摘要】：日益增大的环保压力和市场需求促进了生物质来源树脂基体在复合材料中的应用。本文采用具有优异力学性能的一种新型衣康酸基生物环氧树脂(EIA)作为基体,研究了纤维增强EIA复合材料的界面性能。1、使用EIA作为大麻纤维(HF)复合材料的基体,采用氢氧化钠水溶液对大麻纤维进行表面处理,提高复合材料的界面性能。结果表明,通过碱处理去除纤维表面的半纤维素、木质素等非纤维素部分,使得纤维表面的极性降低,同时提高纤维表面的粗糙度和化学反应活性。碱处理HF/EIA复合材料的界面剪切强度、弯曲性能和冲击强度提高,优于未处理HF/EIA复合材料。与其它天然纤维增强生物基树脂复合材料相比,HF/EIA复合材料的弯曲性能和抗冲击性能优异,表明EIA和HF/EIA复合材料具有良好的应用前景。2、使用EIA作为基体制备T800碳纤维(T800)增强生物基环氧树脂复合材料,采用纤维素纳米纤维(NFC)和纤维素纳米晶(NCC)作为纳米增强材料对T800表面沉积以增强复合材料的界面性能。使用层间剪切强度(ILSS)、动态机械热性能分析(DMTA)、扫面电子显微镜(SEM)研究了T800增强EIA复合材料的界面性能。结果显示,EIA树脂与T800之间的界面结合良好,ILSS为85MPa,力学性能优异。表面改性的NFC与表面改性的NCC具有较高的长颈比和大量的表面羟基和羧基,沉积在T800表面时可以增大与EIA的物理接触和化学键合。DMTA测试表面沉积NFC、NCC的T800/EIA复合材料形成了更好的界面结构,提高了复材的界面性能,使ILSS分别增大至100MPa (NFC)和95MPa (NCC)。其中,长颈比较高的NFC具有更好的界面增强效果。良好界面结构的存在使复合材料界面能更好地传递应力,从而使T800/EIA复合材料的弯曲强度和模量提高。
[Abstract]:Increasing environmental pressure and market demand have promoted the application of biomass-derived resin matrix in composite materials. A new type of itaconic acid based biological epoxy resin with excellent mechanical properties was used in this paper. As the matrix. The interfacial properties of fiber reinforced EIA composites were studied. EIA was used as the matrix of hemp fiber EIA composites. The surface of hemp fibers was treated with sodium hydroxide aqueous solution. The interfacial properties of the composites were improved. The results showed that the polarity of the fiber surface was reduced by alkali treatment to remove the non-cellulose parts such as hemicellulose and lignin on the fiber surface. The interfacial shear strength, flexural property and impact strength of alkali treated HF/EIA composites were improved. Compared with other natural fiber reinforced biological resin composites, the flexural properties and impact resistance of HF- / EIA composites are better than those of untreated composites. The results show that EIA and HF/EIA composites have good application prospect. T800 carbon fiber reinforced T800 / T800 / T800 / T800 / T800 / T800 / T800 / T800 / T800 / T800 / T800 / T800 / T800 /. The interfacial properties of T800 surface were enhanced by using cellulose nanofiber (NFC) and cellulose nanocrystalline (NCCS) as nano-reinforcements. Interlaminar shear strength (ILSS) was used to enhance the interfacial properties of the composites. . The interfacial properties of T800 reinforced EIA composites were studied by dynamic mechanical and thermal analysis and scanning electron microscopy (SEM). The results show that the interfacial properties of T800 reinforced EIA composites have been studied. The interfacial bond between EIA resin and T800 is 85MPa. The surface modified NFC and the surface modified NCC have high ratio of long neck and a large number of surface hydroxyl and carboxyl groups. When deposited on the T800 surface, the physical contact with EIA and the chemical bonding. DMTA test surface deposited NFC NCC T800 / EIA composite formed a better interface structure. The interfacial properties of the composite were improved to increase the ILSS to 100 MPA and 95 MPA respectively. The high NFC with long neck has better interfacial strengthening effect. The existence of good interface structure makes the composite interface transfer stress better. Thus, the flexural strength and modulus of T800 / EIA composites are improved.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ327;TB332

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