摘要
采用高能紫外光反应容器研究天然橡胶(NR)硫化胶的降解过程,探讨NR硫化胶降解程度和溶胶分子结构以及NR硫化胶紫外光降解机理。结果表明:NR硫化胶在高能紫外光照射下能够快速降解,随着照射时间的延长,溶胶质量分数增大,溶胶相对分子质量减小;紫外光照射过程中氧气参与了紫外光降解NR硫化胶过程,使NR硫化胶主链发生断裂,降解产物含有含氧基团,亲水性提高,但随着照射时间的进一步延长,降解产物中的含氧基团继续在紫外光作用下发生反应,含氧基团减少,亲水性降低。
The degradation process of NR vulcanizate was studied by using high energy ultraviolet light（UV） reaction vessel,and the degradation degree of NR vulcanizate,the molecular structure of sol and the UV degradation mechanism of NR vulcanizate were investigated. The results showed that,NR vulcanizate was degraded quickly under the irradiation of high energy UV,as the exposure time prolonged,sol mass fraction increased,and sol molecular weight decreased. During the UV irradiation process,oxygen was involved in the UV degradation process of NR vulcanizate,the main chain of the NR vulcanizate was broken,the degradation products contained oxygen groups,and the hydrophilic property increased. With further exposure, the oxygen-containing groups in degradation products reacted with other groups under UV irradiation,the content of oxygen groups was reduced,and hydrophilic property decreased.
出处
《橡胶工业》
CAS
2016年第10期581-585,共5页
China Rubber Industry
关键词
紫外光降解
天然橡胶硫化胶
降解机理
溶胶
ultraviolet light degradation
NR vulcanizate
degradation mechanism
sol
