Effect of Gas Antisolvent on Conformation of Polystyrene in Tolene：Viscosity and Small—Angle X—ray Scattering Study

• 作者: DanLi JunLiu ShougangWang XiaogangZhang XifengZhang ZhiminLiu
• 来源期刊: 北京同步辐射装置：英文版
• 学科: 化学
• 关键词: 小角X射线散射分析 聚苯乙烯 结构分析 SAXS 甲苯 同步加速器 粘性 二氧化碳溶解
• 年，卷（期）: 2001,（2）
• 页码范围: 1-7
• 页数: 7页
• 分类号: O632.13

摘要

Synchrotron radiation small-angle X-ray scattering(SAXS) and the viscosity technique were used to investigate the effect of dissolved CO2 in toluene on the conformation of polystyrene(PS) in the solution.The viscosity of PS solution decreases faster with increasing antisolvent CO2 pressure than that of the solvent in the absence of the polymer.the intrinsic viscosity [η] calculated using the wellknown Huggins equation decreases with antisolvent pressure.It was found that the second virial coefficient A2 and the apparent mean-square radius of gyration<Rg^2>^1/2 decreases with pressure of antisolvent CO2.All these phenomena can be attributed to the shrink of PS chain in the course of adding the gas antisolvent because the intercation between the polymer and solvent becomes weaker.The values<Rg^2>^1/2 at different pressures obtained from SAXS data agree reasonably with those calculated from Flory theory using the viscosity data determined in this work.This implies that Flory theory,which has been used widely for the solutions of polymers in liquid solvents,is also applicable to the polymer solution with gas antisolvent.