微波辐射凝固天然橡胶硫化胶热氧降解动力学的研究  

Thermo-oxidative Degradation of Vulcanized Natural Rubber Coagulated by Microwave Radiation

作　　者：黄桂春[1,2] 李一民[1] 廖建和[1] 赵艳芳[1] 廖禄生[1] 陈桂雄[1,2] 陈永平[1] 

机构地区：[1]海南大学材料与化工学院,海南儋州571737 [2]海南天然橡胶产业股份有限公司,海南海口57000

出　　处：《热带农业科学》2011年第4期55-59,共5页Chinese Journal of Tropical Agriculture

基　　金：海南省自然科学基金资助项目"微波法天然橡胶生产工艺研究"(No.509007);海南大学重点课题"微波凝固天然橡胶结构与性能研究"(No.2009036)

摘　　要：采用红外光谱(FTIR)分析了微波辐射凝固天然橡胶(NR-m)的结构。采用热分析(TA)法研究了NR-m、酸凝固天然橡胶(NR-a)和自然微生物凝固天然橡胶(NR-n)3种硫化胶在空气气氛中的热氧降解行为;TG和DTG分析结果显示:3种硫化胶的热氧降解均为两步反应,由T0.05判断NR-m硫化胶的热氧稳定性介于NR-a硫化胶和NR-n硫化胶之间;通过Achar法和Coats-Redfem法求得,3种硫化胶热氧降解的微分式机理函数为f(α)=1/2.α-1、积分式机理函数为g(α)=α2,属于一维扩散机理,NR-m硫化胶的热氧降解平均活化能为145.9～152.3 kJ/mol。The structure of natural rubber coagulated by microwave radiation（NR-m） was analyzed by infrared spectroscopy（FTIR）.Thermo-oxidative degradation behavior of the vulcanizates of NR-m,NR-n（natural rubber coagulated by natural microorganisms） and NR-a（natural rubber coagulated by acid） was investigated by（TA） in air-ambient.TG and DTG analysis shows that thermo-oxidative degradation of the three vulcanizates is of two-step reaction,and that judging by T0.05 the thermo-oxidative stability of NR-m vulcanizate is between that of NR-a vulcanizate and NR-n vulcanizate.Calculated by Achar method and Coats-Redfern’s method,the differential and integral mechanism functions of the vulcanizates are f（α）=1/2·α-1 and g（α）=α2,respectively,which belong to one-dimensional diffusion mechanism;the average activation energy of NR-m vulcanizate is 145.9～152.3 kJ/mol.

关 键 词：天然橡胶 微波辐射 凝固 热氧降解 

分 类 号：TQ330.52[化学工程—橡胶工业]