CC. y TT. Fisicoquímicas, Facultad de Ciencias, UNED, Madrid, Spain.
J Phys Chem B. 2009 Dec 31;113(52):16494-500. doi: 10.1021/jp907511v.
Hydrogels of polydimethylacrylamide (PDMAA) cross-linked with bisacrylamide (BA) are synthesized in mixtures of 1,4-bis(2-ethylhexyl) sulfosuccinate sodium salt (AOT) and water with different concentrations. Before polymerization, all samples are isotropic. They become anisotropic due to a phase separation process induced by polymerization. The polymer, which stays in an isotropic microphase, induces the formation of a segregated AOT/water microphase containing ordered domains. These ordered domains present lamellar, cubic, and hexagonal lyotropic organizations, depending on the AOT concentration in the initial isotropic mixture. The lattice parameter of these ordered phases has been analyzed as a function of the composition of the microphases, which has been determined using a simple model, assuming that there is an interaction between the surfactant and the cross-linker that produces a distribution of the AOT between both the polymer rich phase and the lyotropic domains.
PDMAA 与双丙烯酰胺（BA）交联的水凝胶是在不同浓度的 1,4-双（2-乙基己基）磺基琥珀酸钠盐（AOT）和水的混合物中合成的。聚合前，所有样品都是各向同性的。由于聚合诱导的相分离过程，它们变得各向异性。聚合物停留在各向同性微相中，诱导形成含有有序畴的分离 AOT/水微相。这些有序畴呈现层状、立方和六方溶致组织，具体取决于初始各向同性混合物中的 AOT 浓度。使用简单模型分析了这些有序相的晶格参数作为微相组成的函数，该模型假设表面活性剂和交联剂之间存在相互作用，导致 AOT 在聚合物富相和溶致域之间分布。
