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Effects of modified silica on the co‐vulcanization kinetics and mechanical performances of natural rubber/styrene–butadiene rubber blends
Journal of Applied Polymer Science ( IF 3 ) Pub Date : 2019-12-25 , DOI: 10.1002/app.48838
Huanhuan Dong 1 , Yuanfang Luo 1 , Jing Lin 1 , Jie Bai 1 , Yongjun Chen 1 , Bangchao Zhong 1 , Demin Jia 1
Affiliation  

Rubber blends are widely used for combining the advantages of each rubber component. However, to date, how to determine and distinguish the vulcanization kinetics for each single rubber phase in rubber blends during the co‐vulcanization process is still a challenge. Herein, high‐resolution pyrolysis gas chromatography–mass spectrometry (HR PyGC‐MS) was employed for the first time to investigate the vulcanization kinetics of natural rubber (NR) and styrene–butadiene rubber (SBR) in NR/SBR blends filled with modified silica (SiO2). The reaction rates of crosslinking of each rubber phase in NR/SBR were calculated, which showed that the crosslinking rates of NR were much lower than those of SBR phase in the unfilled blends and blends filled with unmodified and silane modified silica. Interestingly, the vulcanization rates of NR and SBR phase were approximately same in the vulcanization accelerator modified silica filled blends, showing better co‐vulcanization. In addition, the vulcanization accelerator modified silica was uniformly dispersed and endowed rubber blends with higher mechanical strength compared to the untreated silica. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48838.

中文翻译:

改性二氧化硅对天然橡胶/丁苯橡胶共混物共硫化动力学和力学性能的影响

橡胶混合物被广泛用于结合每种橡胶组分的优点。然而,迄今为止,如何确定和区分共混过程中橡胶混合物中每个橡胶相的硫化动力学仍然是一个挑战。本文首次采用高分辨率热解气相色谱-质谱(HR PyGC-MS)研究天然橡胶(NR)和丁苯橡胶(SBR)在NR / SBR共混改性橡胶中的硫化动力学。二氧化硅(SiO 2)。计算了NR / SBR中各橡胶相的交联反应速率,结果表明,在未填充的共混物和填充有未改性和硅烷改性的二氧化硅的共混物中,NR的交联速度远低于SBR相的交联速度。有趣的是,在硫化促进剂改性的二氧化硅填充共混物中,NR和SBR相的硫化速率大致相同,显示出更好的共硫化性能。另外,与未处理的二氧化硅相比,硫化促进剂改性的二氧化硅均匀地分散并且赋予橡胶共混物更高的机械强度。分级为4 +©2019 Wiley Periodicals,Inc.J.Appl。Polym。科学 2020137,48838。
更新日期:2020-03-27
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