霉化对天然橡胶组分及其热降解过程的影响  

Effects of Mould on the Components of NR and the Thermal Degradation Process

作　　者：刘欣[1,2] 陈美[1] 王永周[1] 邓维用[1] 

机构地区：[1]农业部热带作物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,广东湛江524001 [2]海南大学材料与化工学院,海南儋州571737

出　　处：《特种橡胶制品》2010年第2期1-6,共6页Special Purpose Rubber Products

基　　金：国家自然科学基金资助项目(50663003);农业部公益性(农业)科研专项经费资助项目(No.nyzx07-033);国家科技项目(No.2009GB23260406)资助

摘　　要：采用红外光谱仪分析了微波干燥未霉化天然橡胶(NR)和霉化天然橡胶(NR—m)的组分。图谱显示,NR在1541.20cm-1处有酰胺Ⅱ吸收峰,而NR—m没有。采用热重分析法分别在氮气和空气气氛中测试了微波干燥的NR和NR—m热降解和热氧降解。TG和DTG曲线显示,NR和NR—m的热降解均为1步反应,热氧降解均为2步反应。在等速升温条件下,NR的热降解温度和热氧降解温度均高于NR—m,NR降解时的活化能明显低于NR—m;2试样的反应级数为:在热降解中n>2,在热氧降解中n<2;在热降解中NR的相关系数r均大于NR—m;随升温速率的增大,2试样的A值和A1值均增大。The components of NR and the mildew natural rubber（NR-m）dryed by using the microwave were tested by using the FTIR analysis.The spectrum showed that NR had amide II absorption peaks at 1541.20 cm-1,but NR-m had not.The thermal degradation in nitrogen and thermal oxidative degradation in air of NR and NR-m dryed by using the microwave were respectively tested by using the thermal gravimetric analysis.TG and DTG curves showed that the thermal degradation of NR and NR-m were one step reaction.The thermal degradation temperature and thermal oxidative degradation temperature of NR were higher than those of NR-m at the same speed of temperature rise.Their reaction series were：n2 in the thermal degradation,n2 in the thermal oxidative degradation;The correlation coefficients of NR were bigger than those of NR-m;A and A1 of them increased with the increase of the speed of temperature rise.

关 键 词：霉化 微波 天然橡胶 热降解 热氧降解 

分 类 号：TQ330.14[化学工程—橡胶工业]