Glassy dynamics of model colloidal polymers: Effect of controlled chain stiffness  

作　　者：Jian Li Bo-kai Zhang Yu-Shan Li 李健;张博凯;李玉山(Department of Physics and Electronic Engineering,Heze University,Heze 274015,China;Department of Physics,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]Department of Physics and Electronic Engineering,Heze University,Heze 274015,China [2]Department of Physics,Zhejiang Sci-Tech University,Hangzhou 310018,China

出　　处：《Chinese Physics B》2021年第3期402-408,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11804085 and 11847115);the Doctoral Foundation of Heze University(Grant No.XY18BS13).

摘　　要：Colloidal polymers with tunable chain stiffness have been successfully assembled in experiments recently.Similar to molecular polymers,chain stiffness is an important feature which can distinctly affect the dynamical behaviors of colloidal polymers.Hence,we model colloidal polymers with controlled chain stiffness and study the effect of chain stiffness on glassy behaviors.For stiff chains,there are long-ranged periodic intrachain correlations besides two incompatible local length scales,i.e.,monomer size and bond length.The mean square displacement of monomers exhibits sub-diffusion at intermediate time/length scale and the sub-diffusive exponent increases with chain stiffness.The data of localization length of stiff polymers versus rescaled volume fraction for different monomer sizes can gather close to an exponential curve and decay slower than those of flexible polymers.The increase of chain stiffness linearly increases the activation energy of the colloidal-polymer system and thus makes the colloidal polymers vitrify at lower volume fraction.Static and dynamic equivalences between stiff colloidal polymers of different monomer sizes have been checked.

关 键 词：glassy dynamics colloidal polymers molecular dynamics mean square displacement 

分 类 号：TQ317[化学工程—高聚物工业] O648.1[理学—物理化学]