Small angle x-ray scattering study on the conformation of polystyrene in toluene during adding anti-solvent CO2
Liu Yi (柳义)a, Chen Dong-Feng (陈东风)a, Wang Hong-Li (王洪立)a, Chen Na (陈娜)a, Li Dan (李丹)b, Han Bu-Xing (韩布兴)b, Rong Li-Xia (荣利霞)b, Zhao Hui (赵辉)c, Wang Jun (王俊)c, Dong Bao-Zhong (董宝中)c
a China Institute of Atomic Energy, Beijing 102413, China; b Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China; c Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China
Abstract The conformation of polystyrene in the anti-solvent process of supercritical fluids (compressed CO2 + polystyrene + toluene) has been studied by small angle x-ray scattering with synchrotron radiation as an x-ray source. Coil-to-globule transformation of the polystyrene chain was observed with the increase of the anti-solvent CO2 pressure; i.e. polystyrene coiled at a pressure lower than the cloud point pressure (Pc) and turned into a globule with a uniform density at pressures higher than Pc. Fractal behaviour was also found in the chain contraction, and the mass fractal dimension increased with increasing CO2 pressure.
Received: 18 March 2002
Revised: 15 May 2002
Accepted manuscript online:
Liu Yi (柳义), Chen Dong-Feng (陈东风), Wang Hong-Li (王洪立), Chen Na (陈娜), Li Dan (李丹), Han Bu-Xing (韩布兴), Rong Li-Xia (荣利霞), Zhao Hui (赵辉), Wang Jun (王俊), Dong Bao-Zhong (董宝中) Small angle x-ray scattering study on the conformation of polystyrene in toluene during adding anti-solvent CO2 2002 Chinese Physics 11 1037
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