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摘要本文以天然橡胶为基体制备了MRE，研究了四种硫化体系对天然橡胶基MRE结构和性能的影响。结果表明，普通硫化体系的MRE具有较好的导热性能、拉伸性能和较高的磁流变效应，但存在严重的硫化返原现象，热稳定性较差；平衡硫化体系硫化的MRE硫化时间较长，交联密度较低，拉伸性能和导热性能较差，磁流变效应较低。有效硫化体系和半有效硫化体系的热稳定性较好，有效硫化体系的磁流变效应在四种硫化体系中最低，有效硫化体系和半有效硫化体系的拉伸性能和导热性能都比普通硫化体系差。25397
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关键词 磁流变弹性体 硫化体系 天然橡胶 磁流变效应
毕业论文设计说明书外文摘要
Title Influence of the vulcanization system on the MREs based on natural rubber
Abstract
The vulcanization system has great effect on the dynamics and structure of natural rubber. However, the Influence of the vulcanization system on the magnetorheological elastomers (MREs) based on nature rubber (NR) still remains unknown. In this paper, four samples of magnetorheological elastomers based on nature rubber were fabricated and their mechanical properties， thermostability and thermal conductivity were measured. The MR effect of MRE samples were evaluated by a modified universal tensile machine. The results show that MRE obtained by conventional cure system showed good mechanical properties， thermal conductivity and high MR effect, but its reversion percentage was high and thermostability was poor. MRE obtained by equilibrium cure system showed a long vulcanizing time as well as low crosslinking density and its mechanical properties were poor. The MREs obtained by efficient curing system and semi- efficient curing system both showed good thermostability but their mechanical properties were poorer than that obtained by conventional cure system.
Keywords Magnetorheological elastomers Nature rubber Vulcanization system magnetorheological effect
目次
1 引言 1
1.1 磁流变弹性体概述 1
1.1.1 磁流变弹性体简介 1
1.1.2 磁流变弹性体的分类 2
1.2 磁流变弹性体的性能 2
1.2.1 磁流变性能 2
1.2.2 物理机械性能 2
1.3 磁流变弹性体的应用 3
1.4 天然橡胶基磁流变弹性体 4
1.4.1 天然橡胶及其硫化体系 4
1.4.2 天然橡胶基磁流变弹性体的硫化性能 4
1.5 本课题的研究意义与主要研究内容 5
2 实验部分 6
2.1 实验原料与仪器 6
2.2 实验内容 7
2.3 性能测试 8
2.3.1 硫化性能测试 8
2.3.2 物理机械性能测试 8
2.3.3 热稳定性测试 8
2.3.4 静态磁流变效应测试 8
2.3.5 微观结构 9
2.3.6 硬度测试 9
2.3.7 导热性能测试 9
3 结果与讨论 10
3.1 硫化性能 10
3.2 物理机械性能 11
3.3 磁流变弹性体的微观结构 12
3.4 静态磁流变性能 13
3.5 热稳定性分析 15
3.6 导热性能分析 17
结论 19
致谢 20
参考文献 21
1 引言
磁流变弹性体(Magnetorheological Elastomers，MREs)是一类新型的智能材料，在外加磁场的作用下，它的许多性能可发生连续的、迅速的和可逆的变化，包括电学性能、磁学性能和力学性能(拉伸性能和阻尼性能)。它通常以橡胶类的高分子聚合物为基体材料，与分散在其中的铁磁性粒子[1]共同固化构成，具有性能稳定、可控性好、响应迅速、结构简单等特点，因而其在减震、制动系统[2]、建筑[3]、振动控制[3]等方面具有广阔的应用前景。