| Mechanical Properties of HNBR at High Temperature |
| Received:February 25, 2020 Revised:March 01, 2020 |
| DOI：10.12136/j.issn.1000-890X.2020.09.0652 |
| Key Words: HNBR；carbon black；high temperature；mechanical property；bound rubber；filler network structure |
| Author Name | Affiliation | E-mail | | LI Xingchen | Qingdao University of Science and Technology | xcli_0532@qq.com | | LI Chaoqin* | Qingdao University of Science and Technology | chaoqinli@sina.com |
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| Abstract: |
| The resilience，shore A hardness，tensile strength，tensile stress relaxation and dynamic mechanical properties of hydrogenated nitrile rubber（HNBR） with different addition levels of carbon black at high temperatures were studied.The effects of temperature on the micro motion and microstructure of rubber molecular chain segment movement and physical crosslinking network were analyzed.The results showed that with the increase of temperature from 25 ℃ to 150 ℃，the shore A hardness and tensile strength of HNBR vulcanizates with different addition levels of carbon black decreased gradually，the resilience first increased and then decreased，the stress relaxation rate increased，and the difference of storage modulus before and after strain scanning decreased.The higher the addition levels of carbon black was，the higher the tensile strength retention rate of HNBR vulcanizates at high temperature was，the smaller the proportion of stress relaxation equilibrium stress was.The increase of temperature would destroy the filler network structure of carbon black reinforced HNBR vulcanizates，resulting in the decrease of bound rubber content and the mechanical properties of HNBR vulcanizates at high temperatures. |
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