过氧化物预硫化天然胶乳硫化反应的交联度及其医用胶乳制品热氧降解的研究  

Study on the crosslinking level of vulcanization of peroxide prevulcanized natural rubber latex and thermooxidative degradation of its medical latex products

作　　者：陈美[1] 黄华明[2] 张北龙[1] 曾宗强[1] 周慧玲[1] 

机构地区：[1]农业部天然橡胶加工重点开放实验室中国热带农业科学院农产品加工研究所,湛江524001 [2]中国热带农业科学院,海南儋州571737

出　　处：《化工新型材料》2006年第10期58-61,共4页New Chemical Materials

基　　金：国家自然科学基金资助项目(编号:50063002);中国热带农业科学院科技项目(RKY0637)

摘　　要：使用溶胀指数的测定方法研究叔丁基过氧化物预硫化天然胶乳(PPVL)胶膜硫化交联度,并采用热重分析法(TGA)研究空气状态下胶管试样热氧降解反应过程及其反应动力学。结果显示,过氧化物预硫化天然胶乳反应在70℃温度下硫化3·5h到达正硫点,此时胶膜溶胀指数为5·9。第一步热氧降解反应前,试样出现明显的吸氧增重现象,其最大热氧降解率CP、最终热氧降解率Cf、反应活化能E和频率因子A均随β的增加而增大,表观活化能E0=107·5kJ/mol。In this paper, vulcanized degree of crosslinking of tert-butyl peroxide prevulcanized natural rubber latex（PPVL） film was studied by assaying swelling index, and the thermooxidative degradation reaction and its kinetics of the medical rubber latex tube sample made from PPVL were studied by TG under air atmosphere. The results showed that the vulcanization reaction index of PPVL at 70℃ for 3.5h reached optimum cure point, and the swelling exponent of PPVL film was 5.9. An oxygen absorption weight gain obviously occured in the sample before the first stage of the thermooxidative degradation reaction, the maximum rate of thermooxidative degradation（Cp ）, the final rate of thermooxidative degradation（C f）, the activation energy of reaction（E）and the frequency factor（A）increase with the increment of the temperature rising rates（β）. The apparent activation energy（E0）was 107.5kJ/mol.

关 键 词：过氧化物预硫化天然胶乳 交联度 TGA 医用胶乳制品 热氧降解 

分 类 号：TQ330.13[化学工程—橡胶工业]