文章摘要
氟硅橡胶热空气老化过程中的非阿累尼乌斯行为
Non-Arrhenius Behavior of Fluorosilicone Rubber Based on Accelerated Aging Test
  
DOI:10.16865/j.cnki.1000-7555.2018.05.019
中文关键词: 氟硅橡胶  热空气老化  非阿累尼乌斯现象  老化机理
英文关键词: fluorosilicone rubber  aging in hot air  non-Arrhenius behavior  ageing mechanism
基金项目:国家自然科学基金重大项目(51790500)
作者单位
孙秀茹, 熊 英, 郭少云 高分子材料工程国家重点实验室 四川大学高分子研究所四川 成都 610065 
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中文摘要:
      对氟硅橡胶进行了热空气加速老化试验,研究了氟硅橡胶在不同温度下的拉伸强度、断裂伸长率、压缩永久变形保持率随老化时间、老化温度的变化规律。研究发现,氟硅橡胶以拉伸断裂伸长率和压缩永久变形为性能变化指标时,均出现非阿累尼乌斯行为,通过动态力学热分析研究了氟硅橡胶出现非阿累尼乌斯行为的原因。结果表明,氟硅橡胶的老化机理是在较低温度下以初期交联、后期降解为主;在较高温度下以降解为主。当以断裂伸长率及压缩永久变形为性能指标时,推测氟硅橡胶的使用寿命分别为37.1年和5.3年。
英文摘要:
      The aging of fluorosilicone rubber was studied under the thermal aging at 90~210 ℃. Tensile test and compressive stress relaxation (CSR) measurements were performed to research the effect of temperature and time on mechanical properties. When the variation of elongation at break and compression set is selected as performance indicator, non-Arrhenius behavior is observed with evidence of a significant lowering of the activation energy among the part of accelerated aging temperature. The dynamic mechanical thermal analysis was performed to fluorosilicone rubber. The results show that the aging mechanism of fluorosilicone rubber is different between high temperature and low temperature. The rubber undergoes predominately crosslinking during the early stage of the degradation process and predominately degradation during the latter stage at low temperature. At the higher temperature, degradation is prevailing.
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