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.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
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
关键词
乙烯-醋酸乙烯共聚物
天然橡胶
发泡质量
力学性能
ethylene-vinyl acetate copolymer
natural rubber
foaming quality
mechanical properties
