文章摘要
导电粒子/聚硅氧烷悬浮体系的流变特性与粒子相结构演变行为
Dynamic Rheology and Filler-Phase Structure Evolution of Conductive Filler Filled Polydimethylsiloxane Suspensions
  
DOI:10.16865/j.cnki.1000-7555.2018.03.012
中文关键词: 石墨烯  粒子网络  剪切作用  流变行为  结构演变
英文关键词: graphene  filler network  shear action  rheological behavior  structure evolution
基金项目:国家自然科学基金青年基金资助项目(51403047);浙江省自然科学青年基金资助项目(LQ13E030009)
作者单位
强 飞1,胡丽丽1,赵振强2,赵 丽1,汤龙程1,吴连斌1,蒋剑雄1 1.杭州师范大学 有机硅化学及材料技术教育部重点实验室,浙江 杭州 311121
2. 石家庄机械化步兵学院一大队一队,河北 石家庄 050085 
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中文摘要:
      采用导电-流变行为同步监测的方法,对比研究炭黑(CB)、石墨烯(rGO)填充聚硅氧烷(PDMS)悬浮体系粒子相结构对应变剪切作用的响应规律。rGO/PDMS、CB/PDMS体系的模量与电性能随粒子含量增加呈现典型的逾渗行为;rGO 质量分数约为1.5%时,导电网络结构基本形成,所需用量远低于CB填充体系(质量分数3.5%)。导电-流变同步监测结果表明,rGO 粒子网络结构对振荡剪切作用非常敏感,γ>0.3%时,导电通路即开始发生破坏,且这种被破坏的rGO 导电网络结构在随后的递减应变扫描和100℃-5000s热处理过程中很难回复。而受振荡剪切破坏的CB网络结构可瞬间回复。
英文摘要:
      Influence of dynamic shear action on filler phase of carbon black (CB) filled and graphene (rGO) filled polydimethylsiloxane (PDMS) was comparatively studied by electrical resistance-rheological behavior simultaneous measurements technology. The relationship curves of both storage modulus-filler content and electrical resistivity-filler content show typical percolation behavior. It is demonstrated a percolated rGO network structure in rGO/PDMS suspension with the content of 1.5%, which is much less than 3.5% in CB-based suspension. The results of electrical resistance-rheological behavior simultaneous measurements show that rGO networks, which is very sensitive to dynamic shear action, start to be destroyed even suffered to small strain (γ>0.3%) shear. The collapsed rGO network appear difficult to reform even with heating at 100 ℃ for 5000 s. However, the rapid recovery behavior of collapsed CB network appear immediately in the subsequent decreased strain sweep.
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