摘要
在胶乳状态下制得不同溴含量的溴化天然橡胶产物,并采用傅里叶红外光谱和1HNMR核磁共振测试技术对胶乳法溴化天然橡胶(BNR)进行了结构表征,用扫描电子显微镜对BNR的形貌进行了观察,考察了不同溴含量BNR的溶解性能和氮含量。红外光谱分析表明,天然胶乳溴化反应时发生了溴化取代和加成反应;1HNMR分析证实存在CC双键加成和亚甲基、甲基的溴化取代。随着溴含量的增加,BNR产物逐渐变得硬而脆,最终呈粉末状,且粒径减小。同一溴化天然橡胶产物在不同溶剂中的溶解能力由小到大依次为:四氯化碳、苯<甲苯、二甲苯<四氢呋喃<三氯甲烷<环己酮;在同一有机溶剂中BNR的溶解性能则随着溴含量的增加而增大。BNR产物的含氮量随着溴含量的增加而减小,当溴含量为42%时,氮含量减小至0.10%。
Brominated natural rubber（BNR） with different bromine content was prepared in the latex phase.Fourier transform infrared spectroscopy（FTIR） and 1H NMR spectroscopy were applied to investigated the microstructures of BNR from latex.Scanning electron microscope（SEM） was adopted to observe the morphology of BNR products,and the solubility and nitrogen content of BNR products with different bromine content were studied.FTIR analysis shows that bromination substitution and addition occur during the brominatio of NR latex.1H NMR analysis confirms the addition of CC group and the bromination substitution of methylene and methyl groups.Bromine content has an obvious effect on the morphology of BNR products.With the increment of bromine content,BNR product is getting hardened and crisp,easier to be powdery and the dimension of particles gradually decreases.The solubility sequence of BNR product in different solvents is as follows：benzene,carbon tetrachloridetoluene,xylenetetrahydrofuranchloroformcyclohexanone;and the solubility of BNR in the same solvent increases with the increment of bromine content.Nitrogen content of BNR products decreases with the increment of bromine content.Nitrogen content decreases to 0.10% when bromine content is 42%.
出处
《应用化学》
CAS
CSCD
北大核心
2010年第5期514-517,共4页
Chinese Journal of Applied Chemistry
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)
关键词
溴化天然橡胶
天然胶乳
微观结构
性能
brominated natural rubber
natural rubber latex
microstructure
property
