Study on Effect of Block Copolymer PS-b-PMMA on Compatibility of PCHMA/ PMMA Blends: Influences of Block Ratio, Molecular Weight and Viscosity
YE Shenjie1, YU Feng1, WANG Keqiang1, WANG Wenjin1, CHEN Zhongren1,2
1 Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211; 2 Department of Chemistry, South University of Science and Technology of China, Shenzhen 518055
Abstract: Melt-mixed method was used to compatibilize poly(cyclohexyl methacrylate) (PCHMA) and poly (methyl methacrylate) (PMMA) binary blends by adding diblock copolymer polystyrene-b-poly (methyl methacrylate) (PS-b-PMMA). Effects of block ratio of PS-b-PMMA, molecular weight (MW) of each homopolymer component,and viscosity of the blend on its compatibility were discussed. We found that the asymmetric block copolymers (BCPs) tend to form micelles and reduce the compatibilization efficiency, rather than the symmetric BCPs. A higher MW leads to an increased amount of BCP micelles. Specifically, increasing the MW of dispersed phase (PMMA) destabilizes the interface, enhances the BCP diffusion into the PMMA phase and forms a larger amount of micelles. On the other hand, increasing the MW of matrix (PCHMA) leads to the increase of phase viscosity, suppresses swelling and external emulsification of the micelle PS block, reduces the micelle migration and keeps the BCP micelles detented inside the PCHMA phase. Therefore, the compatibilization efficiency can be controlled by manipulating the MW of homopolymer component, BCP symmetry and shear viscosity. Finally, the results were interpreted by the Leibler wet-dry brush theory, enthalpy-driven swelling of a polymer brush and Stokes- Einstein diffusion theory.
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2017, Vol. 31 
