Phase-field simulation of microstructure evolution in asymmetric binary polymer blends
The influences of asymmetric degree of miscibility gap on the microstructure evolution and kinetics in binary polymer blends were investigated by the phase-field method.By using the semi-implicit Fourier spectral scheme,the nonlinear Cahn-Hilliard-Cook diffusion equation was numerically solved,and then the effects of asymmetric degree of miscibility gap on the thermodynamics and kinetics of binary polymer blends were explored.The results showed that the asymmetric degree of miscibility gap significantly affected microstructure evolution and kinetic process of the system.At the same time,the initial composition played a key role in determining the evolution path of system.For the asymmetric polymer system,the novel structure transition mechanisms were found,which was attributed to asymmetric kinetics of two phases.In addition,it was found that other kinetic characters were affected by the asymmetric degree of the system,i.e.,the structure factor and characteristic size.The results could reveal the phase separation process of asymmetric polymer system,and would provide a theoretical basis for synthesizing polymer composites with controllable microstructure and physical properties.
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