Dynamic structure of unentangled polymer chains in the vicinity of non-attractive nanoparticles

摘要: Using coarse-grained molecular dynamics simulation, we study the motion of unentangled polymer chains dynamically confined by non-attractive nanoparticles (NPs). Both normal mode and dynamic structure factor S(q, t) analysis are adopted to analyze chain's dynamics. Relaxation behaviors found be significantly slowed down NPs. The relaxation times modes monotonically increasing with NP volume fraction ϕ. At same time, chains' becoming non-Gaussian. Inspection reveals that can attributed two ‘phases’, a bulk phase between is slower than polymer, while still exhibiting high mobility. amount exponentially decay With this figure at hand, establish simple relationship confined/interphase fractions. This work seems provide first quantitative prediction on