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In situ Rheo-GISANS of triblock copolymers: gelation and shear effects on quasi-crystalline structures at interfaces

机译:在三嵌段共聚物的原位Rheo-Gisans:界面上对准晶体结构的凝胶化和剪切效应

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摘要

The behaviour of polymeric systems at surfaces and under flow is extremely important in many applications, ranging from drug delivery to lubrication. We have studied a model triblock copolymer in deuterated water combining in situ rheology and grazing incidence small angle neutron scattering. Several thermotropic phases appear as a function of the temperature, including a bicontinuous phase not present in the bulk. Moreover, gelation can occur following a different route depending on the concentration. We show that shearing can be used to monitor the structural integrity of the micellar systems and in some cases as a tool for modifying the thermotropic phases: an fcc (face centred cubic) phase is sheared into a hcp (hexagonally close packed) phase, and is then recovered by cycling the temperature.
机译:在许多应用中,聚合物系统在表面和流动下的行为在许多应用中非常重要,从药物递送到润滑。 我们已经研究了在氘代水中的三嵌段共聚物中,组合原位流变学和放牧发射小角度散射。 几个热辐射相似作为温度的函数,包括散装中不存在的双连续阶段。 此外,根据浓度在不同的路线之后可以发生凝胶化。 我们表明剪切可用于监测胶束系统的结构完整性,并且在某些情况下作为用于改变热渗阶段的工具:FCC(面朝中心的立方)相剪切成HCP(六角形关闭填充)相位,和 然后通过循环温度回收。

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  • 来源
    《RSC Advances》 |2015年第126期|共8页
  • 作者单位

    ESRF European Synchrotron F-38043 Grenoble 9 France;

    Los Alamos Natl Lab MPA 11 Los Alamos NM USA;

    Netherlands Org Sci Res ESRF European Synchrotron DUBBLE CRG ESRF BM26 Grenoble France;

    Diamond Light Source Ltd Didcot OX11 0DE Oxon England;

    ESRF European Synchrotron UK CRG Beamline XMaS F-38043 Grenoble 9 France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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