Synthesis of Poly (styrene-block-vinyl alcohol) by Successive Photo-Induced Charge Transfer Polymerization and Molecular Dynamics Simulation of its Compatibility for the Blend System

摘要

In the present work, a rapid and novel route to prepare a diblock copolymer consisting of styre,ne and vinyl acetate (VAC) units was performed by successive photoinduced charge-transfer polymerization. (CTP) under UV irradiation, and then a series of objective products PSm-b-PVA(n) bearing different ratios of PS,and PVA was obtained by the hydrolysis of PSm-b-PVAC(n) with sodium ethoxide as the catalyst. Additionally, the influences of the reaction time, concentration of monomer and photoinitiator and kinetics of copolymerization were investigated. Good linear relationships of In([St] (0)/[St]) and In([VAc](0)/[VAc]) with the polymerization time indicated a first-order control/living' process. The copolymers were characterized in detail by means of Fourier transform infrared (IR) spectrometry, H-1 NMR and gel permeation chromatography (GPC). Furthermore, the miscibility of the originally incompatible blend system was improved quite significantly, so a full atomistic molecular dynamics simulation was applied to discuss the binary and ternary systems through the Flory-Huggins parameters, enthalpy of mixing and T-g.