含密胺基团的偶氮苯类凝胶因子的合成及其凝胶性能

Synthesis and Gelation Properties of Azobenzene Gelators with Melamine Moieties

摘要:

摘要：以对硝基苯酚和三聚氯氰为原料，合成了含密胺基团的偶氮苯类凝胶因子AZO-1和AZO-2。考察了AZO-1和AZO-2的临界凝胶温度和临界凝胶浓度，并利用SEM和紫外吸收光谱对凝胶的微观结构以及光响应行为进行了测定。结果表明AZO-2较AZO-1具有更高的临界凝胶转变温度和更低的成胶浓度，表现出较好的凝胶性能。AZO-1和AZO-2的凝胶纤维聚集结构不同，AZO-1纤维取向性较好，排列紧密；AZO-2纤维相互缠绕成三维网络结构，以簇状堆积为主。AZO-1和AZO-2经UV光照后仍可以稳定凝胶，但纤维形态结构发生了一定程度的变化。凝胶因子在不同状态下的红外光谱表明，分子间作用力在凝胶形成过程中起重要作用。

Abstract:

Abstract: Azobenzene gelators AZO-1 and AZO-2 with melamine moieties were designed and synthesized with p-nitrophenol and cyanuric chloride as raw materials. Gel-sol transition temperature and critical gel concentration of AZO-1 and AZO-2 were tested. The morphologies of xerogels and photoresponsive behavior were studied by SEM and UV spectra. The results illustrated that gel-sol transition temperature of AZO-2 are higher than AZO-1 and critical gel concentration are lower. AZO-2 showed better gelation properties. The gel’s fiber aggregation structure of AZO-1 and AZO-2 were different. The fibers of AZO-1 showed good orientation and close arrangement. The fibers of AZO-2 mainly entangled to 3D network and showed cluster structure. AZO-1 and AZO-2 could also gel after irradiation of UV light. But the microstructure of the fibers changed to a certain extent. The IR spectra of gelators in different states indicated the importance of intermolecular forces in gel formation.