title: Equilibrium and dynamical properties of polymer chains in random medium filled with randomly distributed nano-sized fillers.
abstract: The effect of randomly distributed nano-sized fillers on the equilibrium and dynamical properties of linear polymers is studied by using off-lattice Monte Carlo simulation. Lennard-Jones interactions between polymers and fillers are considered. Results show that the statistical dimensions and dynamical diffusion of polymer are dependent on the polymer-filler interaction strength εpf. The mean square radius of gyration 〈RG(2)〉 shows a minimum at a critical polymer-filler interaction εpf*. The value of εpf* decreases with the increase in the polymer length or the concentration of fillers. The exponent ν in 〈RG(2)〉 ∼ N(2ν) is a typical value of self-avoiding walking chain at small εpf but it increases sharply to a bigger value at εpf > εpf*. The mean square displacement decreases with the increase in εpf. Moreover, the normal diffusion of the polymer at weak interactions changes to subnormal diffusion at moderate and strong attractions. We find that polymers diffuse in dilute filler regions at weak attraction and diffuse in dense filler regions at strong attraction.
authors.affiliation: Department of Physics, Hangzhou Normal University, Hangzhou 310036, China. cyli@hznu.edu.cn.
authors.forename: Chao-Yang
authors.initials: CY
authors.lastname: Li
authors.affiliation: Department of Physics, Zhejiang University, Hangzhou 310027, China. luomengbo@zju.edu.cn.
authors.forename: Meng-Bo
authors.initials: MB
authors.lastname: Luo
authors.affiliation: Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China.
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Huang
authors.affiliation: Department of Physics, Wenzhou University, Wenzhou 325035, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Li