高疲劳寿命氯丁橡胶基减振材料的结构与性能

以氯丁橡胶(CR)为基体材料, 将新型反式-1,4-丁二烯-异戊二烯共聚橡胶(TBIR)引入传统CR减振基体中, 探讨TBIR在减振材料中的应用前景. 研究发现, 随着TBIR用量的增加, CR/TBIR混炼胶的强度及模量明显提升; CR/TBIR硫化胶的拉伸强度、 撕裂强度、 压缩永久变形、 动静刚度比及耐疲劳性能均得到改善, 特别是一级疲劳寿命提高了50%~400%(未填充体系)及40%~180%(填充体系), 六级疲劳寿命提高了60%~500%(未填充体系)及30%~120%(填充体系). 与未填充CR/TBIR硫化胶相比, 填充CR/TBIR硫化胶由于炭黑补强作用及填料-聚合物相互作用的引入, 屈挠疲劳寿命、 撕裂强度及拉伸性能均显著提高. 与填充CR硫化胶相比, 填充CR/TBIR质量比为90/10的并用胶能够在保持硫化胶的损耗因子基本不变的基础上, 实现综合性能的平衡提升.

Structure and Properties of Damping Materials with Super Fatigue Resistance Based on Chloroprene Rubber†

A new type of synthetic trans-1,4-poly(butadiene-co-isoprene) copolymer rubber(TBIR) was introduced into the traditional chloroprene rubber(CR) as damping matrix for railway track damping rubber cushion. It was found that CR/TBIR blends exhibited excellent comprehensive properties including significantly increased tensile strength and modulus of the CR/TBIR compounds, the obviously improved tensile strength, tear strength, compression permanent deformation, dynamic and static stiffness ratio and fatigue resistance of the CR/TBIR vulcanizates. Especially, the 1st flexural fatigue lifetimes showed 50%—400% improvements for unfilled CR/TBIR vulcanizates and 40%—180% improvements for the filled CR/TBIR vulcanizates; the 6th flexural fatigue lifetimes showed 60%—500% improvements for the unfilled CR/TBIR vulcanizates and 30%—120% improvements for filled CR/TBIR vulcanizates. Compared with the unfilled CR/TBIR vulcanizates, the 1st flexural fatigue lifetime, tear strength and tensile property of the filled CR/TBIR vulcanizates improved greatly, which were attributed to the better filler dispersion and improved filler-polymer interactions in the CR/TBIR vulcanizates. Compared with pure CR vulcanizate, m(CR)：m(TBIR)=90：10(mass ratio) vulcanizate exhibited balanced comprehensive performances with loss factor changed little.