Abstract
The variation of phase morphology, critical temperature of demixing, and molecular dynamics for polystyrene/poly(vinyl methyl ether) (PS/PVME) blends induced by hydrophilic nanosilica (A200) or hydrophobic nanosilica (R974) was investigated. With the phase separation of blend matrix, A200 migrated into PVME-rich phase due to strong interaction between A200 and PVME, while R974 moved into PS-rich phase. The thermodynamic miscibility and concentration fluctuation during phase separation of blend matrix were remarkably retarded by A200 nanoparticles due to the surface adsorption of PVME on A200, verified by the correlation length ξ near the critical region from rheological measurement and the weakened increment of reversing heat capacity (ΔC p) during glass transition via modulated differential scanning calorimetry (MDSC). The restricted chain diffusion induced by nanosilica still occurred despite no influence of A200 and R974 on the segmental dynamics of homogenous blend matrix. The interactions between nanosilica and polymer components could restrict the terminal relaxation of blend matrix and further manipulate their phase behavior.
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This work was financially supported by the National Natural Science Foundation of China (No. 51273173), the Fundamental Research Funds for the Central Universities (No. 2017QNA4038) and Zhejiang Natural Science Foundation (No. LY16E030001).
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Chen, Q., Zuo, M., Song, Yh. et al. Molecular dynamics and phase behavior of polystyrene/poly(vinyl methyl ether) blend in the presence of nanosilica. Chin J Polym Sci 35, 1524–1539 (2017). https://doi.org/10.1007/s10118-017-1980-z
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DOI: https://doi.org/10.1007/s10118-017-1980-z