Acad Sinica, Inst High Energy Phys, Beijing 100039, Peoples R China
; Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China
Synchrotron small angle X-ray scattering (SAXS) was performed to investigate the effect of dissolved CO2 in toluene on the conformation of polystyrene (PS) in the solution. It has been found that the second virial coefficient A(2) and the radius of gyration R-g decrease with the increasing antisolvent CO2 pressure. The scattering intensity of PS chain followed I (h) proportional to h(-alpha) under different antisolvent pressures (0, 0.6, 1.5, 2.4, 3.3, and 4.2 MPa), suggesting that the PS chain has self-similar structure behavior or a fractal structure in the presence of antisolvent CO2, All this reveals a large effect of antisolvent pressure or the solubility of CO2 in the solution on PS structure. The fractal dimensions increase with the increasing antisolvent pressure, indicating that the polymer chain changes from a swollen coil into a rather dense globule in the course of adding antisolvent CO2.
Dong BZ,Rong LX,Liu Y,et al. Synchrotron small angle X-ray scattering study on the conformation of polystyrene in compressed CO2-toluene mixture[J]. SCIENCE IN CHINA SERIES G-PHYSICS ASTRONOMY,2003,46(6):570-579.
董宝中.,荣利霞.,柳义.,Dong, BZ.,Rong, LX.,...&Liu, ZM.(2003).Synchrotron small angle X-ray scattering study on the conformation of polystyrene in compressed CO2-toluene mixture.SCIENCE IN CHINA SERIES G-PHYSICS ASTRONOMY,46(6),570-579.
董宝中,et al."Synchrotron small angle X-ray scattering study on the conformation of polystyrene in compressed CO2-toluene mixture".SCIENCE IN CHINA SERIES G-PHYSICS ASTRONOMY 46.6(2003):570-579.