Thermodynamic nature of monodisperse polystyrene in mixed solvent of cyclohexane and antisolvent carbon dioxide using synchrotron small-angle X-ray scattering

doi:10.1021/ma021293e

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	Thermodynamic nature of monodisperse polystyrene in mixed solvent of cyclohexane and antisolvent carbon dioxide using synchrotron small-angle X-ray scattering
	Li, D ; Liu, ZM ; Han, BX ; Yang, GY ; Song, LP ; Wang, J ; Dong, BZ
刊名	MACROMOLECULES
	2002-12-31
卷号	35 期号:27 页码:10114-10118
ISSN号	0024-9297
DOI	10.1021/ma021293e
英文摘要	The synchrotron small-angle X-ray scattering (SAXS) technique has been used to study the effect of the antisolvent CO2 on the thermodynamic properties of polystyrene (PS)/cyclohexane (CH) solutions at 34.5 degreesC and at pressures up to 30.0 bar. The molecular weights (M-w) of the monodisperse PS are 3600, 22 400, 84 000, 176 000, and 341 000. The cloud point pressures of the solutions at different solution concentration are also determined. The SAXS results show that the intramolecular radius of gyration (R-g) decreases with approaching cloud point pressure due to the increasing polymer-polymer interaction. At different antisolvent CO2 pressure, there is an exponential relationship between R-g and M-w, and the exponents change from 0.5 to 0.341 with the pressure changing from 0 to 30 bar, which means that the shape of the PS chain changes from random coil to nearly globular. The intermolecular correlation length (xi) increases dramatically as the phase separation boundary is approached, and it is 7 times larger than R-g. Near the phase separation boundary, the thermodynamic fluctuations in ternary systems lead to the formation of distinct microdomains, representing interpenetrating of macromolecules, and dramatic increase of the intermolecular correlation length.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000180089100034
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/78289]
专题	中国科学院化学研究所
通讯作者	Han, BX
作者单位	1.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Li, D,Liu, ZM,Han, BX,et al. Thermodynamic nature of monodisperse polystyrene in mixed solvent of cyclohexane and antisolvent carbon dioxide using synchrotron small-angle X-ray scattering[J]. MACROMOLECULES,2002,35(27):10114-10118.
APA	Li, D.,Liu, ZM.,Han, BX.,Yang, GY.,Song, LP.,...&Dong, BZ.(2002).Thermodynamic nature of monodisperse polystyrene in mixed solvent of cyclohexane and antisolvent carbon dioxide using synchrotron small-angle X-ray scattering.MACROMOLECULES,35(27),10114-10118.
MLA	Li, D,et al."Thermodynamic nature of monodisperse polystyrene in mixed solvent of cyclohexane and antisolvent carbon dioxide using synchrotron small-angle X-ray scattering".MACROMOLECULES 35.27(2002):10114-10118.