Small angle x-ray scattering study on the conformation of polystyrene in toluene during adding anti-solvent CO2

doi:10.1088/1009-1963/11/10/313

中国物理B ›› 2002, Vol. 11 ›› Issue (10): 1037-1041.doi: 10.1088/1009-1963/11/10/313

Small angle x-ray scattering study on the conformation of polystyrene in toluene during adding anti-solvent CO₂

柳义¹, 陈东风¹, 王洪立¹, 陈娜¹, 李丹², 韩布兴², 荣利霞², 赵辉³, 王俊³, 董宝中³

(1)China Institute of Atomic Energy, Beijing 102413, China; (2)Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China; (3)Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China

收稿日期:2002-03-18 修回日期:2002-05-15 出版日期:2002-10-12 发布日期:2005-06-12

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

Received:2002-03-18 Revised:2002-05-15 Online:2002-10-12 Published:2005-06-12

摘要/Abstract

摘要： 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 (P_c) and turned into a globule with a uniform density at pressures higher than P_c. Fractal behaviour was also found in the chain contraction, and the mass fractal dimension increased with increasing CO₂ pressure.

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 (P_c) and turned into a globule with a uniform density at pressures higher than P_c. Fractal behaviour was also found in the chain contraction, and the mass fractal dimension increased with increasing CO₂ pressure.

Key words: small angle x-ray scattering, supercritical fluid, anti-solvent process, polystyrene

中图分类号: (X-ray scattering)

78.70.Ck

62.10.+s (Mechanical properties of liquids)

柳义, 陈东风, 王洪立, 陈娜, 李丹, 韩布兴, 荣利霞, 赵辉, 王俊, 董宝中. Small angle x-ray scattering study on the conformation of polystyrene in toluene during adding anti-solvent CO₂[J]. 中国物理B, 2002, 11(10): 1037-1041.

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[J]. Chinese Physics, 2002, 11(10): 1037-1041.

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Small angle x-ray scattering study on the conformation of polystyrene in toluene during adding anti-solvent CO₂

Small angle x-ray scattering study on the conformation of polystyrene in toluene during adding anti-solvent CO₂

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