淡江大學機構典藏:Item 987654321/25195
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    题名: Self-Assembly of Poly(oxybutylene)−Poly(oxyethylene)−Poly(oxybutylene) (B6E46B6) Triblock Copolymer in Aqueous Solution
    作者: Liu, T.;Zhou, Z.;吳俊弘;Wu, C.;Chu, B.;Schneider, D. K.;Nace, V. M.
    贡献者: 淡江大學化學學系
    日期: 1997-10-23
    上传时间: 2009-12-01
    出版者: American Chemical Society (ACS)
    摘要: Laser light scattering and small-angle neutron scattering were used to study poly(oxybutylene)−poly(oxyethylene)−poly(oxybutylene) triblock copolymers (B6E46B6) in aqueous solution from low to high concentrations and over a range of temperatures from 5 to 35 °C. B6E46B6 molecules exist as unimers at low concentrations and low temperatures. At higher concentrations and at low temperature (≤15 °C), they associate in small numbers and scattering evidence shows that molecular associates with open structures might form. At higher temperatures, typical flowerlike micelles form. The critical micelle concentration decreases with increasing temperature while the association number increases. At high polymer concentrations (e.g., at 35% in mass), further entanglements form among the micelles, yielding another slow mode in dynamic light scattering, which can be attributed to the bridging of two hydrophobic end blocks located in two different hydrophobic clusters by the hydrophilic middle block. However, these cross-linkings were quite weak and free micelles were still the majority in solution. When the temperature is lowered, a very slow process of microphase separation occurs. The self-assembly behavior of B6E46B6 is compared with that of other BEB type triblock copolymers.
    關聯: Journal of physical chemistry B 101(43), pp.8808-8815
    DOI: 10.1021/jp963810z
    显示于类别:[化學學系暨研究所] 期刊論文

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