离子液体对天然橡胶/丁腈橡胶/白炭黑纳米复合材料应变软化行为的影响  

Effects of Ionic Liquid on Strain Softening Behaviors of Silica Filled Natural Rubber/Nitrile Butadiene Rubber Nanocomposites

作　　者：李承宇 宋义虎[1] Cheng-Yu Li;Yi-hu Song(MOE Key Laboratory of Macromolecular Synthesis and Functionalization,Department of Polymer Science and Engineering,Zhejiang University,Hangzhou 310027)

机构地区：[1]高分子合成与功能构造教育部重点实验室浙江大学高分子科学与工程学系,杭州310027

出　　处：《高分子学报》2024年第11期1549-1560,共12页Acta Polymerica Sinica

摘　　要：基于橡胶共混物基体的纳米复合材料在大幅振荡剪切和循环拉伸的作用下呈现应变软化行为,但因界面相互作用、相区尺寸和粒子分布等问题而少有研究涉及其调控机理和方法.本研究采用离子液体(IL)1-丁基-3-甲基咪唑醋酸盐调控白炭黑填充天然橡胶(NR)/丁腈橡胶(NBR)并用胶纳米复合材料的相区结构、粒子分散性、硫化动力学和应变软化行为.结果表明,IL可促进橡胶硫化,降低NBR相区尺寸和橡胶相溶胀比,提高二硫键含量.在大幅动态剪切中,IL可减弱高填充纳米复合材料的Payne效应及其伴随的弱应变过冲行为;在大应变循环拉伸过程中,IL可在不影响滞后能密度的前提下降低软化能密度,减弱Mullins效应.研究结果为调控白炭黑在并用胶基体中的分散性及纳米复合材料的力学性能和应变软化行为提供了实验依据.Rubber nanocomposites show marked strain softening under large-amplitude oscillating shear and large strain cyclic tensile deformations.Due to the interface effect,phase area size and particle distribution,the strain softening behaviors of nanocomposites based on filler filled rubber blends matrices are more complicated and there are rare methods to regulate the rubber crosslinking,phase morphology and rheological behaviors.Herein the effects of ionic liquid(IL)1-butyl-3-methyl imidazole acetate on the phase structure,filler dispersity,vulcanization kinetics and rheological behaviors of silica filled natural rubber(NR)/butadiene nitrile rubber(NBR)nanocomposites were studied.The effects of IL of 0.1 and 1 parts per hundred parts of rubber on the nanocomposites with different silica contents were investigated to regulate their microstructure and rheological behavior.The results show that IL can promote the vulcanization of rubber,reduce the swelling ratio of vulcanizates slightly,and reduce the sizes of the rubber phases.IL can weaken the Payne effect of highly filled nanocomposites and reduce the softening energy density without affecting the hysteretic energy density accompanying the Mullins effect.The results are enlightening for adjusting the rheological behavior and mechanical properties of nanocomposites by adjusting the interaction between nanoparticles and various rubber phases.

关 键 词：橡胶纳米复合材料 白炭黑 离子液体 应变软化 

分 类 号：TB332[一般工业技术—材料科学与工程]