An experimental study on one-step and two-step foaming of natural rubber/silica nanocomposites

Nanotechnology Reviews

article

Hossein Bayat¹  Mohammad Fasihi¹  Yasser Zare²  Kyong Yop Rhee² 

[1] School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology;Department of Mechanical Engineering, College of Engineering, Kyung Hee University

关键词: foam;    natural rubber (NR);    nanosilica;    cellular morphology;    curing;   

DOI  :  10.1515/ntrev-2020-0032

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

The curing and cellular structure of natural rubber (NR)/silica composite foams were investigated. The presence of an activator in the rubber formulation significantly lowered the decomposition temperature of the azodicarbonamide foaming agent, which allowed foaming before NR curing. Therefore, two foam methods were designed: foaming initially at 90°C and then curing at 140°C, and foaming and curing simultaneously at 140°C. Two-step foaming generated a lower cell density and higher cell size. Incorporation of nano silica into NR increased the foam density, but decreased the cell size. The higher foaming temperature restricted the bubble growth because of a higher curing rate and inhibited cell coalescence.

【 授权许可】

CC BY