天然橡胶基凹凸棒土纳米复合材料制备及性能研究  

Study on Preparation and Properties of Attapulgite Reinforced Natural Rubber Nanocomposites

作　　者：赵国璋[1,2] 施利毅[1,3,2] 卓靖[3,2] 冯欣[1,2] 丁鹏[1,2] 付继芳[1,2] 

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]上海大学纳米科学与技术研究中心,上海200444 [3]上海大学理学院,上海200444

出　　处：《材料工程》2011年第11期9-14,79,共7页Journal of Materials Engineering

基　　金：上海市科学技术委员会纳米专项基金项目(0852nm01100);上海市教育委员会重点学科建设项目(J50102);上海大学研究生创新基金项目(SHUCX101050)

摘　　要：采用机械共混法制备了天然橡胶(NR)基凹凸棒土(AT)纳米复合材料,研究了复合材料的微观结构、力学性能及硫化特性,探讨了AT补强NR的机理。结果表明,改性后的AT能在NR基体中达到均匀分散并形成良好的聚合物-填料界面,显示出优异的补强效果。AT不但在胶料硫化过程中充当了交联点,而且在试样拉伸过程中沿拉伸方向取向,起了诱导结晶的作用。复合材料的拉伸结晶行为与填料量及填料粒子表面交联点数量有关。改性剂不同导致胶料交联行为存在差异,从而影响复合材料的拉伸结晶及应力-应变行为。改性及胶料混炼未破坏AT的层链结构。Attapulgite（AT） reinforced natural rubber（NR） nanocomposites were prepared by mechanical compounding.The microstructures,mechanical properties and curing characteristics of the nanocomposites were investigated.The reinforcement mechanism of AT in NR was clarified.The results show that the modified AT exhibited outstanding reinforcement due to its homogeneous dispersion in the NR matrix and the strong polymer-filler interactions.AT needles not only act as crosslink points during the vulcanization,but also orient along the stretch direction and thus induce crystallization when the samples were stretched.The strain-induced crystallization of the nanocomposites is associated with the filler loading and the crosslink density on the surfaces of AT needles.Different modifiers result in different crosslinking characteristics,and affect the strain-induced crystallization and stress-stain behaviors of the nanocomposites.The layer-chain structure of AT is not influenced by the modification and mechanical compounding.

关 键 词：天然橡胶 凹凸棒土 纳米复合材料 硫化特性 结晶 

分 类 号：TB332[一般工业技术—材料科学与工程]