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Effect of Halloysite Nanotubes on the Rheological and Phase Separation Behaviors in a Poly(ethylene oxide)/Ionic Liquid Mixture
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-06-25 , DOI: 10.1002/macp.202000108
Huan Luo 1 , Gang Liu 1 , Yunlei Chen 1 , Yanhua Niu 1 , Guangxian Li 1
Affiliation  

A series ternary composites of poly(ethylene oxide)/ionic liquid 30/70 (P30) with uniformly dispersed halloysite nanotubes (HNTs) are investigated in the homogeneous and two‐phase regions. For P30/HNTs composites, a relatively lower percolation threshold about 3 wt% of HNTs loading is observed in the single‐phase region of P30. Beyond the percolation threshold, the steady shear flow exhibits two shear‐thinning regions due to the coupled relaxation of HNTs network and polymer entanglement. In the two‐phase region of P30, the mobility of ionic liquids (ILs) can be impeded accounting for the filler network forming. Not only the phase recovery during cyclic heating–cooling treatment near the phase boundary is accelerated, but also the phase separation kinetics is significantly retarded owing to HNTs dispersed in the PEO‐rich phase impeding the escaping of ILs from PEO phase. The lower storage modulus G′ for P30/HNTs‐4wt% compared to P30/HNTs‐3wt% in a two‐phase region is connected with the competition between the filler contribution and additional elasticity induced by phase separation.

中文翻译:

埃洛石纳米管对聚环氧乙烷/离子液体混合物中流变和相分离行为的影响

研究了均相和两相区域中聚环氧乙烷/离子液体30/70(P30)与均匀分散的埃洛石纳米管(HNT)的一系列三元复合材料。对于P30 / HNTs复合材料,在P30的单相区域观察到相对较低的渗透阈值,约为HNTs负载的3 wt%。超过渗滤阈值,由于HNTs网络和聚合物缠结的耦合松弛,稳态剪切流表现出两个剪切稀化区域。在P30的两相区域,由于填充物网络的形成,离子液体(IL)的迁移性可能会受到阻碍。不仅加速了相界附近的循环加热-冷却处理期间的相恢复,但是由于HNT分散在富含PEO的相中阻碍了IL从PEO相的逸出,因此相分离动力学也显着受阻。较低的储能模量在两相区域中,P30 / HNTs-4wt%的G '与P30 / HNTs-3wt%的G '与填料贡献和相分离引起的附加弹性之间的竞争有关。
更新日期:2020-06-25
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