Dynamic light-scattering study of self-assembly of diblock copolymers in supercritical carbon dioxide.
Dynamic light-scattering study of self-assembly of diblock copolymers in supercritical carbon dioxide.
复制标题
超临界二氧化碳中二嵌段共聚物自组装的动态光散射研究。
DOI：
10.1364/ao.40.004170
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发表时间：
2001
期刊：
影响因子：
1.9
通讯作者：
Benjamin Chu
中科院分区：
文献类型：
--
作者：
Tadanori Koga;Shuiqin Zhou;Benjamin Chu
利用高压动态光散射技术研究了聚全氟丙烯酸二氢辛酯和聚醋酸乙烯酯（PFOA-b-PVAC）在超临界CO2中的溶液行为。在等压和等温条件下，在9-55.2 MPa的压力范围和25-75 ℃的温度范围内，分别测定了每种物质，如单体、胶束和大聚集体的流体动力学半径分布。动态光散射结果清楚地表明了共聚物在超临界二氧化碳中的压力诱导和温度诱导的溶解和缔合行为。还提出了一些初步的实验结果的胶束自组装的氟化嵌段共聚物，聚（2-四氢吡喃基甲基丙烯酸酯）-b-聚（1H，1H-全氟辛基甲基丙烯酸酯）（THPMA-b-F7 MA），在超临界二氧化碳中使用一种新的高压细胞，使我们能够同时进行小角X射线散射和DLS测量。
A high-pressure dynamic light-scattering (DLS) technique has been utilized to study the behavior in solution of poly(1, 1-dihydroperfluorooctylacrylate) and poly(vinyl acetate) (PFOA-b-PVAC) in supercritical carbon dioxide. The hydrodynamic-radius distribution for each species, such as unimers, micelles, and large aggregates, were determined under both isobaric and isothermal conditions over a pressure range of 9-55.2 MPa, and a temperature range of 25-75 degrees C, respectively. The DLS results clearly showed both pressure-induced and temperature-induced dissolution and association behavior for the copolymer in supercritical carbon dioxide. Also presented are some preliminary experimental results for the micellar self-assembly of a fluorinated block copolymer, poly(2-tetrahydropyranyl methacrylate)-b-poly(1h, 1h-perfluorooctyl methacrylate) (THPMA-b-F7MA), in supercritical carbon dioxide by use of a new high-pressure cell that allows us to conduct simultaneous small-angle x-ray scattering and DLS measurements.