磨碎玻璃纤维／聚氨酯／环氧灌封材料的形态结构与力学性能  

Morphology and mechanical properties of MG/PU/EP encapsulating composite

作　　者：李芝华[1] 谢科予[1] 郑子樵[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2007年第1期51-55,共5页Journal of Central South University:Science and Technology

基　　金：军工民口配套项目(MKPT-04-388)

摘　　要：采用真空灌注工艺,制备磨碎玻璃纤维(MG)／聚氨酯(PU)／环氧(EP)灌封材料,并对其力学性能和微观结构进行研究。研究结果表明:随着PU含量的增加,PU／EP共混聚合物的拉伸和冲击强度呈先升后降的变化趋势。当PU含量为15％时,共混聚合物的综合力学性能最佳,拉伸强度为60．57 MPa,冲击强度为23．56 kJ／m2,与EP相比分别提高32．77％和115％。为进一步提高材料的强度,并保持良好韧性,采用添加MG的方法来增强PU／EP。当MG与EP的质量比为1:1时,材料的拉伸强度达到79．72 MPa,与PLJ／EP相比提高31．95％,而冲击强度为17．83 kJ／m2,仍保持较高水平;同时,与相同含量的活性硅微粉相比增强PU／EP材料的拉伸强度和冲击强度分别提高18．91％和11．51％。Milled glass fiber （MG）/polyurethane （PU）/epoxy resin （EP） encapsulating material was prepared by vacuum priming. The morphology and mechanical properties of the material were studied. The results indicate that the tensile strength and impact strength of PU/EP increase first, and then decrease with the increase of content of PU. When the content of PU is 15%, the mechanical properties of composite are optimal： the tensile strength is 60.57 MPa and impact strength is 23.56 kJ/m^2. The tensile strength and impact strength are increased by 32.77% and 115%, respectively, compared with the pure EP. In order to improve the strength further and remain the toughness, MG was employed to reinforce PU/EP composite. When the mass ratio of MG to EP is 1：1, the tensile strength is 79.72 MPa and the impact strength is 17.83 kJ/m^2. Compared with the composite reinforced by SiO2 particles with the same content, the tensile strength and impact strength of MG/PU/EP are increased by 18.91% and 11.51%, respectively.

关 键 词：磨碎玻璃纤维 聚氨酯 环氧树脂 灌封材料 形态结构 力学性能 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]