Strengthening effect of Mullins effect of high- density polyethylene/ethylene-propylene-diene terpolymer thermoplastic vulcanizates under compression mode
Strengthening effect of Mullins effect of high- density polyethylene/ethylene-propylene-diene terpolymer thermoplastic vulcanizates under compression mode
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DOI：
10.1177/0892705717738288
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发表时间：
2018-10-01
影响因子：
3.3
通讯作者：
Wang, Zhaobo
中科院分区：
文献类型：
--
作者：
Liu, Qingqing;Zhang, Kai;Wang, Zhaobo
采用动态硫化法制备了高密度聚乙烯（HDPE）/三元乙丙橡胶（EPDM）热塑性硫化胶（TPV）。系统地研究了压缩模式下Mullins效应的力学性能和强化效果。结果表明，与EPDM硫化胶相比，TPV的压缩强度有较大提高。在单轴加载-卸载循环过程中，TPV的压缩应力-应变曲线中存在明显的Mullins效应，而EPDM硫化胶的压缩应力-应变曲线中几乎不存在Mullins效应。在第一次加载-卸载循环后，最大压缩应力和比应变下的内耗损失均有所降低，而在随后的加载-卸载循环中，最大压缩应力和比应变下的内耗损失仅略有降低;但残余变形量随着压缩循环次数的增加而增加。随压缩应变和HDPE含量的增加，Mullins效应显著增强。
Thermoplastic vulcanizates (TPVs) based on high-density polyethylene (HDPE)/ethylene-propylene-diene terpolymer (EPDM) were prepared via dynamic vulcanization. The mechanical properties and strengthening effect of Mullins effect under compression mode were investigated systematically. Experimental results indicated that the compression strength of TPVs was enhanced greatly compared with that of EPDM vulcanizate. Mullins effect could be observed obviously in the compression stress-strain curves of the TPVs while it was hardly to obverse in that of EPDM vulcanizate during the uniaxial loading-unloading cycles. The maximum compression stress and internal friction loss at specific strain were decreased after the first loading-unloading while only decreased slightly at the later loading-unloading cycles; however, the residual deformation increased with the increasing of the cycle times of compression. Mullins effect could be significantly enhanced with increasing compression strain and HDPE content in TPV.