改性伊蒙土对天然乳胶纳米复合材料的力学性能影响

Effect of Modified ISIC on Mechanical Properties of NRL Nanocomposites

采用高能纳米冲击磨和十二烷基三甲氧基硅烷(DDES)共同修饰伊蒙土(ISIC),制备了低片层数、高分散性的改性伊蒙土(M-ISIC),并将M-ISIC通过乳胶共混法填充天然乳胶(NRL)制备出不同添加量的伊蒙土/天然乳胶纳米复合材料(M-ISIC/NRL)。研究结果表明,DDES的硅氧烷基团与ISIC表面的羟基发生反应,在M-ISIC的表面形成DDES接枝改性层,DDES的利用率为53.08%,M-ISIC的表面接触角提升至141.37°。并且,修饰后的ISIC均匀地分散在天然乳胶中,形成稳定的填料-乳胶交联网络结构。其中1%M-ISIC/NRL性能较优,断面形貌均匀,储能模量(G′)大。70℃下热氧老化240 h后,其拉伸强度及撕裂强度保持率分别为86.75%、66.75%,表现出较优异的耐热氧老化性能。

Fewer layered and high dispersibility M-ISIC was prepared through DDES surface modification and high energy nanoimpact milling using illite-smectite interstratified clay(ISIC).Then,M-ISIC/natural rubber latex nanocomposites(M-ISIC/NRL)with different filling contents were prepared by latex blending.The results showed that the siloxane groups of DDES successfully reacted with the hydroxyl groups on the ISIC surface to form a grafting modified layer.The surface contact angle of M-ISIC was increased to 141.37°,and the utilization rate of DDES was 53.07%.The M-ISIC was evenly dispersed in natural latex to form a stable filler-latex cross-linking network structure.Among them,the performance of 1%M-ISIC/NRL was relatively high and its section morphotogy was uniform and storage modulus(G′)was large.After thermal oxygen aging at 70℃for 240 h,The retention rates of tensile strength and tear strength retention of the samples were 86.75%and 66.75%,respectively,and showing an excellent heat-resistant oxygen aging performance.