高等学校化学学报

高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (6): 1521.doi: 10.7503/cjcu20130040

• 高分子化学 • 上一篇    下一篇

17R4/F127混合水溶液的凝胶结构

谢宇1, 吕中元1, 孙昭艳2, 安立佳2, 李秀宏3, 吴忠华4   

  1. 1. 吉林大学理论化学研究所, 理论化学计算国家重点实验室, 长春 130021;
    2. 中国科学院长春应用化学研究所, 高分子物理与化学国家重点实验室, 长春 130022;
    3. 中国科学院上海应用物理研究所, 上海同步辐射光源小角实验站, 上海 201800;
    4. 中国科学院高能物理研究所, 北京同步辐射光源小角实验站, 北京 100049
  • 收稿日期:2013-01-10 出版日期:2013-06-10 发布日期:2013-05-10
  • 通讯作者: 孙昭艳,女,博士,研究员,主要从事高分子物理研究.E-mail:zysun@ciac.jl.cn E-mail:zysun@ciac.jl.cn
  • 基金资助:

    国家自然科学基金(批准号: 21074137, 21122407, 50930001)和国家"九七三"计划项目(批准号: 2012CB821500)资助.

Gel Structure of the 17R4/F127 Mixed Solutions

XIE Yu1, LV Zhong-Yuan1, SUN Zhao-Yan2, AN Li-Jia2, LI Xiu-Hong3, WU Zhong-Hua4   

  1. 1. State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130021, China;
    2. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
    3. Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
    4. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • Received:2013-01-10 Online:2013-06-10 Published:2013-05-10

PDF (PC)

被引次数

6

摘要：

结合流变学频率扫描和同步辐射小角X射线散射(SAXS), 研究了17R4(PO14-EO24-PO14)含量和温度对17R4/F127(EO99-PO65-EO99)混合水溶液凝胶结构的影响. 结果表明, 溶胶、 软凝胶和硬凝胶分别对应无序结构、 无序与立方相共存结构以及立方相结构. 对于F127水溶液体系, 可以将F127形成的胶束看作硬球, 随着温度的升高, 胶束的硬球半径和胶束中F127链的聚集数随之减小, 这是因为17R4在较低温度下很难形成胶束, 当温度升高时, 17R4链参与胶束的形成, 从而使胶束数目增加, 因此每个胶束中的F127链数也随之减小. 当17R4含量较高时, 胶束外壳中F127部分的PEO链段数随着温度升高而减小, 胶束外壳变得更软, 因此, 当17R4/F127摩尔比为2: 1时, 混合溶液在高温下呈现面心立方(fcc)到体心立方(bcc)的结构转变.

关键词: 凝胶结构, 小角X射线散射, 流变, 聚氧乙烯-聚氧丙烯-聚氧乙烯, 聚氧丙烯-聚氧乙烯-聚氧丙烯

Abstract:

Rheology and small angle X-ray scattering(SAXS) were used to study the effect of the content of 17R4(PO14EO24PO14) and temperature on the gel structure of the 17R4/F127(EO99PO65EO99) mixed solutions. It was indicated that the structures of sol, soft gel and hard gel were corresponding to disorder phase, disorder/cubic coexisted phase and cubic phase. With increasing temperature, hard sphere radius and aggregation number of micelle decreased. For pure 17R4, it is difficult to form micelles. However, when the temperature was increased, 17R4 chains took part in the formation of micelles and therefore the number of micelles increased, which made the number of F127 chains in one micelle decrease. Thus, the number of PEO blocks of F127 in coronal part decreased and then the coronal part became softer. As a result, a fcc-bcc transition occurred in the system with 17R4/F127 molar ratio of 2.

Key words: Gel structure, Small angle X-ray scattering, Rheology, Poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)(PEO-PPO-PEO), Poly(propylene oxide)-poly(ethylene oxide)-poly(propylene oxide)(PPO-PEO-PPO)

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