胶乳法溴化天然橡胶的热降解研究  

Thermal Degradation of Brominated Natural Rubbers from Latex

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

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：《橡胶工业》2011年第6期330-333,共4页China Rubber Industry

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资助项目(xjszx-14);海南省教育厅高等学校科研项目(Hj200768)

摘　　要：采用胶乳法分别制备了溴质量分数为0.28和0.41的溴化天然橡胶（BNR）,并采用傅里叶变换红外光谱法和热重分析法研究其热降解和热氧降解过程。结果表明：胶乳法BNR热降解为2步反应,第1步发生脱溴化氢反应,试样的质量损失率近似等于其溴质量分数;第2步BNR在475℃降解时仍有6.9%~8.8%的残留物存在,且较稳定。胶乳法BNR热氧降解分3步进行,第1步反应的温度及质量损失率与热降解相近,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。Thermal degradation and thermal-oxidative degradation of brominated natural rubbers（BNRs） from latex with different bromine mass fraction of 0.28 and 0.41 were investigated by FTIR and TG methods.The results showed that,thermal degradation of BNR was a two-step reaction,dehydrobromination occurred during the first step,and the weight-loss ratio was close to bromine content of BNR.The second step was at 475 ℃,and after that 6.9%~8.8% of stable residue remained.The thermal-oxidative degradation of BNR was a three-step reaction.Both degradation temperature and weight-loss ratio of the first step were close to those of thermal degradation,and the decomposition products were mainly hydrogen bromide and a little carbon dioxide.The decomposition products of the second step and the third step were carbon dioxide,and the thermal-oxidative degradation ratio reached to almost 100%.

关 键 词：溴化天然橡胶 胶乳法 热降解 热氧降解 

分 类 号：TQ330.1[化学工程—橡胶工业]