| In this paper, living polymerization was introduced into the preparation of thermoplastic interpenetrating polymer network(IPN) for the first time. By sequential method, SBS as polymer I , poly(styrene-methyl methacrylate) synthesized by atom transfer radical polymerization(ATRP) as polymer II , SBS/poly(styrene-methyl methacrylate) thermoplastic IPN was successfully prepared.The effects of polymerization temperature, composition of initiation system, ratio of monomers and reaction time were studied. It was shown that when the polymerization of styrene and methyl methacrylate(MMA) was initiated by BPO/CuCl/bpy(mole ratio 1:1:3) at 90 癈, consistent with characteristics of living polymerization, the mass averaged molecular weight of polymer II linearly increased with monomers conversion and the polydispersities kept very low.The IPN was characterized by FT-IR, NMR and GPC, the results showed that both molecular weight distributions of the IPN components were narrow.The mechanical property, adhesive property, rheological behavior and dynamic mechanical behavior of the IPN were investigated. The results showed that tensile strength increased with MMA content in original monomers, but with polymer II content, increased first, then decreased; tensile shearing strength increased with both polymer II content and MMA content; melt viscosity decreased with polymer II content, increased a little with MMA content. Dynamic mechanical behavior showed that the compatibility was improved and the damping behavior of the IPN was increased.The influence of polymerization method was investigated by studying the properties of the IPN prepared by conventional radical polymerization. The results showed that the IPN prepared by ATRP was preferable except for the tensile strength.Ion group was introduced into the IPN by hydrolyzing the ester group of MMA, it was shown that, after ionization, the tensile strength and module of the IPN considerably increased, elongation and flowability decreased. |
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