English  |  正體中文  |  简体中文  |  Items with full text/Total items : 51510/86705 (59%)
Visitors : 8273463      Online Users : 100
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/25195

    Title: Self-Assembly of Poly(oxybutylene)−Poly(oxyethylene)−Poly(oxybutylene) (B6E46B6) Triblock Copolymer in Aqueous Solution
    Authors: Liu, T.;Zhou, Z.;吳俊弘;Wu, C.;Chu, B.;Schneider, D. K.;Nace, V. M.
    Contributors: 淡江大學化學學系
    Date: 1997-10-23
    Issue Date: 2009-12-01
    Publisher: American Chemical Society (ACS)
    Abstract: 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.
    Relation: Journal of physical chemistry B 101(43), pp.8808-8815
    DOI: 10.1021/jp963810z
    Appears in Collections:[化學學系暨研究所] 期刊論文

    Files in This Item:

    File Description SizeFormat

    All items in 機構典藏 are protected by copyright, with all rights reserved.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback