| Effect of Thermo-oxidative Aging on Chemical Structure and Properties of CR |
| Received:December 14, 2020 Revised:December 14, 2020 |
| DOI：10.12136/j.issn.1000-890X.2021.09.0659 |
| Key Words: CR；thermal-oxidative aging；chemical structure；oxidative fracture；crosslinking density；sol；molecular weight；tensile property |
| Author Name | Affiliation | E-mail | | HU Lijuan | Qingdao University of Science and Technology | 1021570495@qq.com | | TIAN Yong | Jiangsu Jsy Latex Products Co.，Ltd | | | FENG Guangzi | Qingdao University of Science and Technology | | | LI Xiaoxiao | Qingdao University of Science and Technology | | | HAN Jingjie* | Qingdao University of Science and Technology | 1021570495@qq.com |
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| Abstract: |
| Chloroprene rubber（CR） was subjected to thermal-oxidative aging，and the effects of aging time at 100 ℃ on the chemical structure，crosslinking density，sol mass fraction and molecular weight distribution，chlorine mass fraction and tensile properties of CR vulcanizate were studied. The results showed that，during the thermal-oxidative aging process，the rubber molecular chains of CR vulcanizate were oxidized，and the chemical structure changed significantly. In the initial stage of aging，the crosslinking density of CR vulcanizate increased，the sol mass fraction and molecular weight decreased，and the rubber molecular chains were mainly crosslinked. After aging for more than 192 h，the crosslinking density of CR vulcanizate decreased，the sol mass fraction，molecular weight and its distribution index increased，and oxidative fracture of the rubber molecular chains became more severe. In the aging process，CR vulcanizates became more and more structured due to crosslinking and dechlorination，leading to the dramatic reduction of the tensile properties. |
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