Properties of vulcanized rubber nanocomposites filled with nanokaolin and precipitated silica
Properties of vulcanized rubber nanocomposites filled with nanokaolin and precipitated silica
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DOI：
10.1016/j.clay.2007.12.005
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发表时间：
2008-12-01
影响因子：
5.6
通讯作者：
Xu, Hongliang
中科院分区：
文献类型：
--
作者：
Liu, Qinfu;Zhang, Yude;Xu, Hongliang
将平均厚度20~50 nm、平均直径300~500 nm、比表面积32m(2)/g的纳米高岭土(NK)粉末引入丁苯橡胶(SBR)、天然橡胶(NR)、丁二烯橡胶(BR)和三元乙丙橡胶(EPDM)四种橡胶中。通过与沉淀法白炭黑(PS)的比较，评价了它们的增强效果。研究了各种橡胶基复合材料的硫化性能、力学性能、微观结构和热稳定性。这是通过硫化技术、力学测试、热重分析(TGA)、透射电子显微镜(TEM)和X射线衍射仪(X射线衍射仪)完成的。结果表明，NK可缩短交联胶的最佳硫化时间(t(90))，延长固化时间(t(10))，大大改善硫化工艺，提高生产效率和操作安全性。纳米高岭土填充橡胶复合材料具有良好的力学性能、热稳定性和弹性性能。橡胶/天然橡胶复合材料的拉伸强度接近橡胶/PS复合材料的拉伸强度，但撕裂强度和弹性模量不如含沉淀白炭黑的复合材料。微观结构分析表明，NK片材在橡胶基体中呈平行排列，分散良好。NK与橡胶链之间良好的界面相互作用使这些橡胶复合材料具有优异的加工性、力学性能和热稳定性。(C)2008年，爱思唯尔出版。
One kind of nanokaolin (NK) powder with 20-50 nm average thickness, 300-500 nm average diameter, and 32 m(2)/g specific surface area, has been introduced into four types of rubber, specifically styrene butadiene rubber (SBR), natural rubber (NR), butadiene rubber (BR) and ethylene-propylene diene methylene (EPDM). Their reinforcing effects were evaluated by comparisons with those from precipitated silica (PS). The curability, mechanical properties, microstructure and the thermal stability of a variety of composites based on these rubbers were studied. This was done using vulcanization techniques, mechanical testing, thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results showed that NK can greatly improve the vulcanizing process by shortening the time to optimum cure (t(90)) and prolonging the setting-up time (t(10)) of cross-linked rubbers, which improves production efficiency and operational security. The rubber composites filled with nanokaolin were found to have good mechanical properties, thermal stabilities, and elastomeric properties. The tensile strengths of the rubber/NK composites are close to those of rubber/PS composites, but the tear strength and modulus are not as good as the corresponding properties of those containing precipitated silica. Microstructural results revealed that the NK sheets are well dispersed in the rubber matrix in the parallel arrangement. The good interfacial interactions between the NK and the rubber chains give these rubber composites excellent processability, mechanical properties, and thermal stability. (C) 2008 Published by Elsevier B.V.