PBO纤维增强复合材料的制备及其性能的研究
发布时间:2018-07-27 15:04
【摘要】:高强高模PBO纤维作为先进复合材料的增强体,具有广阔的应用前景。考察PBO纤维增强复合材料的性能对其应用有指导意义。同时又由于PBO纤维表面光滑,且大分子链上无极性官能团,致使其与树脂基体之间的界面粘结性能差。因此,如何提高PBO纤维与树脂之间的界面粘结性能成为PBO纤维研究的方向之一。 本论文采用不同的成型技术制备PBO纤维与环氧树脂单向复合材料和织物复合材料,考察了纤维增强复合材料的拉伸强度、模量与其成型技术、纤维含量的关系;同时采用表面涂层法来研究PBO纤维与树脂的粘结性能。主要工作如下: 首先,确定了环氧树脂618/固化剂593体系的固化工艺参数,,半固化阶段:50℃/150min;模压阶段:预热80℃/5min,80℃/0.3MPa/5min,80℃/2.5MPa/6min。采用长丝缠绕成型工艺和模压成型技术制备PBO纤维/环氧树脂单向复合材料,选用合适的垫片与试样形状进行拉伸试验。结果表明:单向复合材料拉伸强度和模量随着PBO纤维含量增加呈现先上升后下降的趋势,当纤维含量达56%左右时,材料的拉伸强度和模量达最大,分别为1.44GPa、41.7GPa。通过SEM分析,纤维与树脂在界面脱粘,纤维与环氧的界面粘结性差,破坏形式属于界面破坏,没有发挥出纤维的最高强度。 其次,为了进一步改善PBO纤维与树脂的界面性能,使用聚芳酰胺和固化剂二亚乙基三胺分别对纤维表面进行处理,通过考察纤维表面化学结构、表面形貌及纤维与树脂之间界面剪切强度(IFSS),来研究两种涂层剂对PBO纤维表面性能的影响。研究发现:固化剂对PBO纤维的改性效果更显著,与未处理PBO纤维相比,经聚芳酰胺处理的纤维与树脂IFSS增加了70%,而经过固化剂处理的IFSS增加95%;破坏模式也由纯粹的界面破坏变成基体与纤维本体的破坏。另外,经固化剂处理纤维,通过长丝缠绕制备纤维单向复合材料,其力学性能有着显著提高。通过SEM,进一步证实了破坏模式为基体与纤维本体的共同破坏。 最后,将纤维织成织物,通过不同的成型技术分别制备PBO/PA复合材料和PBO/环氧树脂复合材料,考察了织物层数对纤维含量的影响,并对材料的径向拉伸强度、模量及其表面形貌进行了初步研究。实验发现:PA膜片数一定时,减少织物层数,纤维含量降低且降低趋势减缓;当纤维含量为61%左右时,PBO/PA复合材料的拉伸强度与模量达最大值分别为876.4MPa、44.0GPa;在一定厚度范围内(1.5mm),增加织物层数可使得PBO/环氧树脂复合板中PBO纤维含量增加,同时也使得复合板径向拉伸强度、模量提高;两种织物复合材料的破坏均属于界面破坏,但前者没有发挥出PBO纤维的强度,后者发挥出部分纤维丝束的强度。
[Abstract]:High strength and high modulus PBO fiber as a reinforcement of advanced composites has a broad application prospect. The study of the properties of PBO fiber reinforced composites has guiding significance for its application. At the same time, due to the smooth surface of PBO fiber and the non-polar functional group in the macromolecular chain, the interfacial adhesion between PBO fiber and resin matrix is poor. Therefore, how to improve the interfacial adhesion between PBO fiber and resin has become one of the research directions of PBO fiber. In this paper, PBO fiber and epoxy resin unidirectional composites and fabric composites were prepared by different molding techniques. The relationship between tensile strength, modulus and molding technology and fiber content of fiber reinforced composites was investigated. At the same time, the adhesion between PBO fiber and resin was studied by surface coating method. The main work is as follows: firstly, the curing process parameters of epoxy resin 618 / curing agent 593 system are determined, the semi-curing stage is 1: 50 鈩
本文编号:2148206
[Abstract]:High strength and high modulus PBO fiber as a reinforcement of advanced composites has a broad application prospect. The study of the properties of PBO fiber reinforced composites has guiding significance for its application. At the same time, due to the smooth surface of PBO fiber and the non-polar functional group in the macromolecular chain, the interfacial adhesion between PBO fiber and resin matrix is poor. Therefore, how to improve the interfacial adhesion between PBO fiber and resin has become one of the research directions of PBO fiber. In this paper, PBO fiber and epoxy resin unidirectional composites and fabric composites were prepared by different molding techniques. The relationship between tensile strength, modulus and molding technology and fiber content of fiber reinforced composites was investigated. At the same time, the adhesion between PBO fiber and resin was studied by surface coating method. The main work is as follows: firstly, the curing process parameters of epoxy resin 618 / curing agent 593 system are determined, the semi-curing stage is 1: 50 鈩
本文编号:2148206
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