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首页> 外文期刊>Journal of Applied Polymer Science >Small-angle neutron scattering of poly(styrene)/poly(acrylic acid-ethyl acrylate) copolymers: The effect of the degree of hydrolysis of the poly(acrylic acid-ethyl acrylate) block
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Small-angle neutron scattering of poly(styrene)/poly(acrylic acid-ethyl acrylate) copolymers: The effect of the degree of hydrolysis of the poly(acrylic acid-ethyl acrylate) block

机译：聚苯乙烯/聚丙烯酸-丙烯酸乙酯共聚物的小角中子散射：聚丙烯酸-丙烯酸乙酯嵌段水解度的影响

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摘要

We report the results of systems based on polystyrene-poly(ethyl acrylate) (PEA) diblocks, which self-assemble in aqueous solutions to form spherical micelles. Previous work has shown that the rheological properties of these solutions, in particular the gel-liquid transition, can be tuned through the use of a simple hydrolysis reaction to convert PEA to poly(acrylic acid) (PAA). We studied the effect of the extent of hydrolysis on the self-assembly and micellar interactions. Small-angle neutron scattering (SANS) spectra were fit with a variety of models to determine the micelle structure. As more PEA was converted to PAA (i.e., as the corona became more charged and more hydrophilic), the micellar aggregation number decreased, analogous to observations of other polymeric micelles. This effect could impact the gel-liquid transition and rheology in this system and in similar micellar block copolymer gels. Finally, our SANS spectra qualitatively agreed with predictions for attractive colloidal glasses, confirming the idea that the elasticity of these gels arises from the jamming of micelles. (C) 2004 Wiley Periodicals, Inc.
机译：我们报告了基于聚苯乙烯-聚（丙烯酸乙酯）（PEA）二嵌段体系的结果，该体系在水溶液中自组装形成球形胶束。先前的工作表明，可以通过使用简单的水解反应将PEA转化为聚丙烯酸（PAA）来调节这些溶液的流变性，特别是凝胶-液体转变。我们研究了水解程度对自组装和胶束相互作用的影响。小角中子散射（SANS）光谱与各种模型拟合以确定胶束结构。随着更多的PEA转化为PAA（即，随着电晕带更多的电荷和更多的亲水性），胶束聚集数减少，类似于其他聚合胶束的观察结果。这种作用可能会影响该系统和类似胶束嵌段共聚物凝胶的凝胶-液体转变和流变性。最后，我们的SANS光谱在质量上与诱人的胶体玻璃的预测吻合，证实了这些凝胶的弹性源自胶束的阻塞。 （C）2004年Wiley Periodicals，Inc.

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