溴化天然橡胶的热降解研究  

Study on thermal degradation of brominated natural rubber

作　　者：薛行华[1,2] 吴耀辉[1] 凌军[1] 王凤平[1] 符新[2] 

机构地区：[1]海南大学材料与化工学院,海南海口570228 [2]中国热带农业科学院橡胶研究所,海南儋州571737

出　　处：《弹性体》2011年第2期20-23,共4页China Elastomerics

基　　金：中国热带农业科学院橡胶研究所基本科研业务费专项资金项目(xjszx-14);海南省教育厅高等学校科研项目(Hj200768)

摘　　要：用傅立叶变换红外光谱法和热失重分析法研究了溴质量分数分别为31%、51%和69%的溴化天然橡胶(BNR)的热降解和热氧降解过程。结果表明,BNR热降解为两步反应,第1步BNR发生脱溴化氢反应,失重率近似等于其溴含量;第2步BNR31、BNR51和BNR69在475℃降解时仍有9.7%、15.6%和12.7%的残留物存在,且较稳定。BNR热氧降解分3步进行,第1步反应的温度及降解率与热降解相近,产物主要是溴化氢,此外还有少量二氧化碳;第2步和第3步产物为二氧化碳,且分解彻底。Thermogravimetric analysis and fourier transform infrared spectroscopy were used to study thermal and thermal-oxidative degradations of brominated natural rubbers（BNR） with different bromine content of 31%,51% and 69%.The results showed that thermal degradation of BNR is a two-step reaction.Dehydrobromination occurs during the first step,and the weight-loss ratio is close to bromine content of BNR.There respectively remain 9.7%,15.6% and 12.7% of stable carbon residues during second-step thermal degradation of BNR31,BNR51 and BNR69 at 490℃.The thermal oxidative degradaton of BNR is a three-step reaction.Both degradation temperature and weight-loss ratio of first-step thermal oxidative degradation are close to those of thermal degradation,and the products are mainly hydrogen bromide but a little carbon dioxide.The products of second-step and third-step are carbon dioxide.The thermal oxidative degradation ratio reaches to almost 100%.

关 键 词：溴化天然橡胶 热降解 热氧降解 

分 类 号：O613.3[理学—无机化学] TQ332.5[理学—化学]