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受阻酚/羧基丁腈橡胶复合材料的结构及动态力学性能

, PP. 8-14

Keywords: 羧基丁腈橡胶(XNBR),受阻酚,阻尼材料,杂化,动态力学性能

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Abstract:

将羧基丁腈橡胶(XNBR)和受阻酚2,2′-亚甲基双-(4-甲基-6-叔丁基苯酚)(AO-2246)混合制备出挤压和未挤压AO-2246/XNBR复合材料,并对其结构及动态力学性能进行了研究。研究结果表明,AO-2246在XN2BR基体中的分散状态对体系的动态力学性能影响较大。在未挤压样品中,大部分AO-2246分子以晶体颗粒的形式存在,体系的损耗因子(tanδ)比纯XNBR基体低;而在挤压样品中,由于热压淬火过程中两组分发生杂化,体系的tanδ值明显增大,体系的阻尼性能显著提高。差示扫描量热(DSC)分析和扫描电镜(SEM)观察表明,当AO-2246质量分数高于40%后,杂化体系中AO-2246以3种形态存在:杂化形态、微相分离态以及结晶态,它们共同对体系的动态力学性能产生影响。AO-2246质量分数为50%的杂化体系的tanδ峰峰值高达3.5,同时该峰位置由低温区向高温方向移动至室温附近,从而使AO-2246/XNBR复合材料成为一种极具潜力的高性能阻尼材料。

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