Abstract: Effects of microwave exposure time on modification behaviors of crumb rubber are studied.The influence of exposure time on microwave modification effect is characterized through sol content determined by both Soxhlet extraction and gel permeation chromatography, and crosslinking density obtained by LF-NMR.Structural and morphological changes of crumb rubber before and after microwave irradiation are characterized by FTIR and SEM.It is found that the sol content in samples will increase and the crosslinking density will decrease to the lowest when the microwave power is 700 W, sample mass is 40.0 g and exposure time is 5 min.Microwave treatment can promote C-S and S-S cross-link bonds to break out, increase the surface porosity of crumb rubber and activate consequently crumb rubber.However, with over long microwave exposure time, the crosslinking density will increase, the regeneration rate of cross-linked structure will accelerate and the modification effect tends to bad.
叶园园, 周晓龙, 李政. 微波改性对废轮胎胶粉表面性能的影响[J]. 现代化工, 2018, 38(10): 140-143.
YE Yuan-yuan, ZHOU Xiao-long, LI Zheng. Effect of microwave modification on surface properties of crumb rubber. Modern Chemical Industry, 2018, 38(10): 140-143.
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