用核磁共振法研究微生物凝固天然橡胶硫化过程交联密度的变化  

Variation of Cross-link Density of Natural Rubber Coagulated by Microorganisms During the Vulcanization Process Studied by Means of Nuclear Magnetic Resonance Spectroscopy

作　　者：汪志芬[1] 佘晓东[2] 李思东[3,2] 钟杰平[3] 何灿忠[2] 

机构地区：[1]海南大学材料与化工学院,海南海口570228 [2]农业部热带作物产品加工重点实验室,广东湛江524001 [3]广东海洋大学理学院,广东湛江524088

出　　处：《广东化工》2010年第1期8-9,22,共3页Guangdong Chemical Industry

基　　金：国家自然科学基金资助项目(50773013;50573064)

摘　　要：采用核磁共振交联密度仪,考察了微生物凝固天然橡胶在硫化过程交联密度(XLD),网链含量(AMc),自由小分子含量(AT2)以及相邻交联点间的质量(Mc)的动态变化规律。结果表明,硫化初期,XLD和AMc随硫化时间增加急剧增大,但t50后增速降低,并逐步趋于稳定。与AMc相反,自由悬挂链末端及活动性强的小分子等部分的含量(AT2)随着硫化时间的增加而降低,并逐步趋于稳定。橡胶交联点间的相对分子质量(Mc)与交联密度成反比。The dynamic variation of cross-link density（XLD）, crosslinked fraction（AMc）, highly mobile fraction（AT2） and molecular mass（Mc） of natural rubber coagulated by microorganisms （NR-m） during the vulcanization process were characterized by nuclear magnetic resonance spectroscopy（NMR）. The results show that, with the prolonging of the vulcanization time, XLD and AMc increased gradually, but the increment decreased after ts0 and reached a certain level. In the contrast, the AT2 decreases apparently with the prolonging of the vulcanization time. Mc has a negative relationship with XLD.

关 键 词：微生物 天然橡胶 核磁共振 交联密度 硫化 

分 类 号：TQ333.4[化学工程—橡胶工业] P641.7[天文地球—地质矿产勘探]