纳米高岭土和白炭黑硫化橡胶复合材料

采用硫化和机械性能测试以及热重分析(TGA)和透射电子显微镜(TEM)等手段,对纳米高岭土(NK)和白炭黑(PS)各自填充的丁苯橡胶(SBR)、天然橡胶(NR)、顺丁橡胶(BR)、三元乙丙橡胶(EPDM)等四种复合材料的硫化性能、力学性能、热稳定性能和微观结构进行了表征和时比.结果表明,纳米高岭土有效改善了橡胶前期硫化的操作安全性,加快了硫化速度,提高了生产效率.其橡胶复合材料具有优异的弹性,拉伸性能与白炭黑橡胶基本接近,撕裂强度和定伸强度比白碳黑稍差.纳米高岭石在橡胶基体中分散性良好,片层厚度小于100 nm,呈定向平行排列.纳米高岭石粒子与橡胶大分子之间良好的界面结合,是促进其热稳定性能提高的主要原因.图5,表3,参11.

Vulcanized Rubber Composites Filled with Nanokaolin and Precipitated Silica

With methods of vulcanizing and mechanical testing,thermogravimetric analysis(TGA),transmission electron microscope(TEM),the curability,mechanical properties,microstructure,and the thermal stability of the styrene butadiene rubber(SBR),natural rubber(NR),butadiene rubber(BR),and ethylene-propylene diene methylene(EPDM) composites which are filled respectively by nanokaolin(NK) and precipitated silica(PS) were characterized and compared.The results show that NK effectively improves the operation safety of prophase vulcanizing rubbers,quickens the vulcanization rate,and availably advances the production efficiency.The rubber composites filled with nanokaolin are of outstanding elasticity,and its tensile strength closes to the precipitated silica,but the tear strength and the modulus is not superior to the precipitated silica.NK sheets are well dispersed in the rubber matrix in the parallel direction with less than 100nm.The good interface links between NK and rubber molecules are contributed to the excellent thermal stability of the rubber composites.5Figs.,3Tabs.,11refs.