| Property of NBR with Different Branching Degree |
| Received:February 14, 2019 Revised:February 14, 2019 |
| DOI：10.12136/j.issn.1000-890X.2020.01.0030 |
| Key Words: NBR；branching degree；molecular structure parameter；relative molecular weight；bound acrylonitrile content；Mooney viscosity；processability；physical property |
| Author Name | Affiliation | E-mail | | ZHENG Fangyuan* | Yanshan Branch of Sinopec Beijing Research Institute of Chemical Industry | zhengfy.bjhy@sinopec.com | | LIU Ping | Yanshan Branch of Sinopec Beijing Research Institute of Chemical Industry | | | WANG Leilei | Yanshan Branch of Sinopec Beijing Research Institute of Chemical Industry | | | DUAN Haidong | Yanshan Branch of Sinopec Beijing Research Institute of Chemical Industry | |
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| Abstract: |
| The influence of NBR branching degree on its properties was studied by comparing molecular structure parameter，processability and vulcanizate properties of three brands of nitrile-butadiene rubber（NBR） with similar bound acrylonitrile content and Mooney viscosity. The order of branching degree was obtained
through the frequency scanning，strain scanning，and stress relaxation analysis. For raw rubber and mixing compound of NBR with higher branching degree，the viscosity was more sensitive to shear rate，the increase of Mooney viscosity of mixed compound relative to that of raw rubber was small，and the carbon black
dispersion and the homogeneity of vulcanizate property were better. For raw rubber and mixing compound of NBR with low branching degree，the viscosity was more sensitive to temperature，the tensile strength and elongation at break were higher，and compression set of the vulcanizates was smaller. |
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