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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; Wang J(王俊); Dong BZ(董宝中)
2002
发表期刊MACROMOLECULES
卷号35期号:27页码:10114-10118
通讯作者Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China ; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
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.
文章类型Article
学科领域Polymer Science
研究领域[WOS]Polymer Science
DOI10.1021/ma021293e
URL查看原文
语种英语
WOS类目Polymer Science
WOS记录号WOS:000180089100034
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被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240168
专题多学科研究中心
作者单位中国科学院高能物理研究所
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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.,...&董宝中.(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.
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