天然橡胶/EVA发泡复合材料发泡质量及力学性能的分析  

Analysis of Foaming Quality and Mechanical Properties of Microcellular Foamed Natural Rubber/Ethylene-Vinyl Acetate Copolymer Composites

作　　者：张敬[1] 王醴均[1] 张纯[1] 何力[1] 郭建兵[1] 于杰[1] 龚维[1,2] 

机构地区：[1]国家复合改性聚合物材料工程技术研究中心,贵州贵阳550014 [2]贵州师范大学材料与建筑工程学院,贵州贵阳550014

出　　处：《高分子材料科学与工程》2014年第3期53-58,共6页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(21264004);黔科合GY字(2011)3011号;黔科合重大专项字[2011]6018号;黔科合重大专项字[2012]6023

摘　　要：采取模压成型的方式制备发泡天然橡胶/乙烯-醋酸乙烯共聚物(EVA)复合材料,通过复合材料的相容性和硫化与发泡匹配机理,研究了EVA含量对天然橡胶发泡质量及力学性能的影响。结果表明,随着EVA含量的增加,泡孔直径、泡孔尺寸分布先增大后降低,泡孔密度先降低后增大。EVA含量为20 phr时,其泡孔质量最好,泡孔直径为97.1μm,泡孔尺寸分布为23.2μm,泡孔密度为6.8×106cm-3,当EVA含量超过20 phr时,泡孔直径、泡孔尺寸分布逐渐增大,泡孔密度随之降低。复合发泡材料的硬度、冲击回弹性、热压缩永久变形等性能则随着EVA含量的增加出现小范围降低,但结合发泡材料的性价比来看,在EVA含量为20 phr时,发泡材料的力学性能较理想。Foamed natural rubber （NR）/ethylene-vinyl acetate copolymer （EVA） composites were prepared by molding technology. According to the consistency and the mechanism of match between curing and blowing of the composites, the influence of EVA content on foaming quality and properties of foamed NR/EVA composites was studied. The results show that with the increase of EVA content from 0 phr to 20 phr, the cell size and the cell size distribution increase at first,and then reduce; the cell density decreases first and then increases. When adding 20 phr EVA, foaming effect is perfect for foamed NR/EVA composites, such as the cell size of 97 μm, the cell size distribution of 23.2 μm, and the cell density of 6.8×106 cm-3. When the EVA content exceeds 20 phr, the cell size and the cell size distribution increase; the cell density decreases. The shore hardness, impact resilience, hot compression set exhibit a small proportion reduction with the increasing of EVA content. When EVA content is 20 phr, mechanics properties of foamed NR/EVA composites are ideal.

关 键 词：乙烯-醋酸乙烯共聚物 天然橡胶 发泡质量 力学性能 

分 类 号：TQ332[化学工程—橡胶工业]