| 发泡三元乙丙橡胶在热空气及湿热和盐雾环境下的老化机理研究 |
| Study on Aging Mechanism of Foamed EPDM under Hot Air，Humid Heat and Salt Spray Environment |
| 投稿时间：2022-01-13 修订日期：2022-01-13 |
| DOI：10.12136/j.issn.1000-890X.2022.06.0403 |
| 中文关键词: 发泡三元乙丙橡胶 热空气老化 湿热老化 盐雾老化 老化机理 二次交联 交联密度 |
| 英文关键词: foamed EPDM hot air aging humid heat aging salt-fog aging aging mechanism secondary crosslinking |
| 基金项目:国家自然科学基金资助项目(51873006) |
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| 中文摘要: |
| 研究发泡三元乙丙橡胶（EPDM）在热空气、湿热及盐雾环境下的老化机理。结果表明：对于橡胶分子主链结构饱和的发泡EPDM，热空气、湿热及盐雾老化对其橡胶分子主链结构的破坏很小；热空气老化引起的二次交联可以增大发泡EPDM的交联密度，且温度越高，二次交联越剧烈，交联密度达到极值后，随老化时间的进一步延长，交联密度下降；湿热老化可以加速老化过程中发泡EPDM的二次交联，35 ℃盐雾老化对交联密度影响不大。 |
| 英文摘要: |
| The aging mechanism of foamed ethylene-propylene-diene rubber（EPDM）under hot air，humid heat and salt spray environment was studied. The results showed that，for foamed EPDM with the saturated rubber molecular main chain structure，hot air aging，humid heat aging and salt spray aging had little damage to the rubber molecular main chain structure. The secondary crosslinking caused by hot air aging could improve the cross-linking density of foamed EPDM，and the higher the temperature was，the more
intense the secondary cross-linking was. After reaching the extreme value of the cross-linking density of foamed EPDM，the cross-linking density decreased with the further extension of the aging time. Humid heat aging could accelerate the secondary cross-linking of foamed EPDM during aging process，and salt spray aging at 35 ℃ had little effect on the crosslinking density. |
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