Roles of hydrophobic interaction in a volume phase transition of alkylacrylamide gel induced by the hydrogen-bond-driving alkylphenol binding.
Roles of hydrophobic interaction in a volume phase transition of alkylacrylamide gel induced by the hydrogen-bond-driving alkylphenol binding.
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DOI：
10.1021/jp046236x
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发表时间：
2005-01
期刊：
影响因子：
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通讯作者：
T. Kawashima;Shogo Koga;M. Annaka;S. Sasaki
中科院分区：
文献类型：
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作者：
T. Kawashima;Shogo Koga;M. Annaka;S. Sasaki
结果表明，烷基酚类化合物与N-烷基丙烯酰胺凝胶的结合程度呈过渡性增加，从而引起凝胶的体积相变。研究了壬基苯酚（n-Ph）、丙基苯酚（p-Ph）、乙基苯酚（e-Ph）、甲基苯酚（m-Ph）和苯酚（Ph）与N-异丙基丙烯酰胺（NIPA）、N，N-二乙基丙烯酰胺（DEA）、N，N-二甲基丙烯酰胺（DMA）和丙烯酰胺（AM）凝胶的结合等温线。观察到两种类型的结合，在β 1处的位点结合，其中β是与链的单体单元结合的程度。前者的结合分析与希尔方程适用于合作的结合和后者结合的Brunauer-Emmett-Teller（BET）方程适用于多层吸附。的结合常数，K，希尔系数，N，降低和增加，分别在DEA，NIPA，和DMA凝胶的顺序中的情况下，其中结合烷基酚是相同的。与同一类型凝胶结合的K值按Ph、m-Ph、e-Ph、p-Ph和n-Ph的顺序增加。发现N值随结合烷基酚的类型变化不大。N-烷基酰胺与烷基酚的络合物缩合形成有序的纳米结构，在小角X射线散射实验中观察到宽散射峰。观察到的荧光准分子发射的苯酚结合DMA凝胶，这对应于苯酚的缩合状态。
It was found that a degree of the binding of alkylphenols to N-alkylacrylamide gel increased transitionally to induce the volume phase transition of gel. Binding isotherms of nonylphenol (n-Ph), propylphenol (p-Ph), ethylphenol (e-Ph), methylphenol (m-Ph), and phenol (Ph) to N-isopropylacrylamide (NIPA), N,N-diethylacrylamide (DEA), N,N-dimethylacrylamide (DMA), and acrylamide (AM) gels were examined. Two types of binding, the site binding at beta 1, were observed, where beta was a degree of binding to a monomeric unit of the chain. The former binding was analyzed with the Hill equation applicable to the cooperative binding and the latter binding with the Brunauer-Emmett-Teller (BET) equation applicable to the multilayer adsorption. The binding constant, K, and the Hill coefficient, N, decreased and increased, respectively, in the order of DEA, NIPA, and DMA gels in the case where the binding alkylphenol was the same. The K value increased in the order of Ph, m-Ph, e-Ph, p-Ph, and n-Ph that bound to the same type of gel. The N value was found to change little with the type of binding alkylphenol. The complexes of N-alkylamide with alkylphenol were condensed to form the ordered nanostructures that were observed as broad scattering peaks in small-angle X-ray scattering experiments. The fluorescence excimer emission was observed for the phenol-binding DMA gel, which corresponded to the condensed state of phenol.