摘要
采用溶胀法研究了热氧老化对氯丁橡胶(CR)交联密度和力学性能的影响。结果表明,随着老化时间的延长,CR交联密度先增大后减小,温度越高增幅越明显;拉伸强度和100%定伸应力变化趋势与交联密度相近,拉断伸长率快速降低后趋于定值,硬度逐渐增加。热氧老化条件下,CR内部大分子之间发生交联反应,产生交联键,交联密度增加,力学性能由此表现出不同的变化趋势。
The equilibrium swelling method was used to study the influence of thermal-oxidative aging on crosslink density and mechanical properties of CR.The results showed that with aging time prolonged, crosslink density increased firstly and then decreased, the higher the temperature, the more obvious the increase- the variation trends of tensile strength and 100% constant tensile stress were same compared with crosslink density changed, the breaking elongation decreased rapidly and then tended to a constant value, and the hardness increased gradually. Under the thermal-oxidative aging conditions,crosslink reaction occurred between the molecules inside of the CR, produced the cross- linking bond, crosslink density increased; the macroscopic mechanical properties showed different trends.
出处
《弹性体》
CAS
2016年第4期20-23,共4页
China Elastomerics
基金
山东省自然科学基金资助项目(ZR2014EMM018)
关键词
CR
热氧老化
溶胀法
交联密度
choroprene rubber lthermal-oxidative aging lswelling method
crosslink density
