Rheological Behaviors of Polymers with Nanoparticles Tethered at Each End  

作　　者：Song-Qi Zhang Wen-Qing Wang Jia-Ping Lin Li-Quan Wang 

机构地区：[1]Shanghai Key Laboratory of Advanced Polymeric Materials,Key Laboratory for Ultrafine Materials of Ministry of Education,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China

出　　处：《Chinese Journal of Polymer Science》2024年第3期400-406,I0009,共8页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos.21774032 and 51833003);Shanghai Scientific and Technological Innovation Projects (No.22ZR1417500)。

摘　　要：The polymer with nanoparticles tethered at each end is a unique model for unraveling the effect of chain ends on the polymer dynamics. We investigated the rheological behavior of this kind of polymer by using nonequilibrium molecular dynamics simulation. The effect of polymer lengths and nanoparticle radii on the complex moduli and viscosity was examined. The dependence of complex moduli on the frequency becomes less pronounced as the polymer is short or the nanoparticle is large. The shear thinning behavior was revealed for these systems, and the scaling exponent of complex viscosity with respect to the frequency was found to change from-1/2 to-3/4 as the polymer shortens or the nanoparticle enlarges. The rheological behavior was further explained by analyzing the mean square distance of nanoparticles. The simulation results were compared with the existing experimental finding, showing an agreement. The work provides information for understanding the chain end effect on polymer rheology.

关 键 词：Polymer rheology MODULUS VISCOSITY Molecular dynamics 

分 类 号：TQ317[化学工程—高聚物工业] TB383.1[一般工业技术—材料科学与工程]