Porcar Iolanda, Solar Lorena, Abad Concepción, Gómez Clara M, Campos Agustín
Departament de Química Física, Institut de Ciència dels Materials, Universitat de València, C/Dr. Moliner 50, Burjassot 46100, València, Spain.
J Chromatogr A. 2004 Mar 26;1031(1-2):117-23. doi: 10.1016/j.chroma.2003.10.042.
The preferential adsorption coefficient, lambda, of poly(methyl methacrylate), PMMA, in solutions formed by an epoxy resin in tetrahydrofuran (THF), was studied by size-exclusion chromatography (SEC). Only PMMA of lowest molar mass was preferentially solvated by epoxy but at low concentrations of epoxy in the mixture. At higher epoxy content PMMA was preferentially solvated by THF. A simultaneous and competitive solvation between the specific interactions PMMA-epoxy and the self association of epoxy at high concentrations would be the responsible of this inversion point. The more compacted coil of PMMA of higher molecular weights in solution could explain the lack of interaction of these polymers with epoxy. The results also indicated that lambda decreased with the molar mass. This variation has been attributed to the influence of the coil segment density on preferential adsorption.
通过尺寸排阻色谱法（SEC）研究了聚甲基丙烯酸甲酯（PMMA）在环氧树脂于四氢呋喃（THF）中形成的溶液中的优先吸附系数λ。只有最低摩尔质量的PMMA在混合物中环氧树脂浓度较低时被环氧树脂优先溶剂化。在较高的环氧树脂含量下，PMMA被THF优先溶剂化。在高浓度下，PMMA-环氧树脂之间的特定相互作用与环氧树脂的自缔合之间的同时竞争溶剂化是导致该转变点的原因。溶液中较高分子量的PMMA更紧密的线团可以解释这些聚合物与环氧树脂缺乏相互作用的原因。结果还表明，λ随摩尔质量降低。这种变化归因于线团链段密度对优先吸附的影响。
