Abstract
The polymer with nanoparticles tethered at each end is a unique modelfor unraveling the effect of chain ends on the polymer dynam-ics.We investigated the rheological behavior of this kind of polymer by using nonequilibrium molecular dynamics simulation.The effect of poly-mer lengths and nanoparticle radii on the complex moduli and viscosity was examined.The dependence of complex moduli on the frequency be-comes 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 re-suIts were compared with the existing experimental finding,showing an agreement.The work provides information for understanding the chain end effect on polymer rheology.
基金项目
National Natural Science Foundation of China(21774032)
National Natural Science Foundation of China(51833003)
Shanghai Scientific and Technological Innovation Projects(22ZR1417500)
维普
万方数据