Abstract
Polystyrene–poly(t-butyl acrylate) diblock polymers (PS–PTBA) were prepared by sequential anionic polymerization with s-butyllithium as the initiator and tetrahydrofuran at −78°C as the solvent. The microdomain structures of these polymers observed by electron microscopy were two coexisting microphases consisting of PS blocks and PTBA blocks. Linear dynamic mechanical responses of the block polymers exhibited two primary dispersions typical of two-phase polymer systems. Primary dispersions of PTBA microdomains and of PS microdomains shifted respectively toward higher and lower temperatures with increasing PTBA fraction. These shifting cannot be explained as the effect of molecular weight of the block chains i.e., the effect of the excess free volume of free chain ends. The shift of the PTBA primary dispersion was attributed to the excess free volume in the PTBA microdomains frozen-in during the solidification process and/or to the domain-boundary relaxation effect. The shift of the PS primary dispersion was considered to arise from domain-boundary relaxation effect, i.e., the effect of dynamical interactions of the chains in the respective domains at the domain-boundary interphase on mechanical relaxation behavior. The greater the specific surface area of the interfaces or the volume fraction of the interphase, the larger is the shift of PS and PTBA primary dispersions.
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Tsukahara, Y., Izumi, A., Hashimoto, T. et al. Microdomain Structure and Dynamic Mechanical Properties of Polystyrene–Poly(t-butyl acrylate) Diblock Polymers. Polym J 14, 887–894 (1982). https://doi.org/10.1295/polymj.14.887
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DOI: https://doi.org/10.1295/polymj.14.887