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首页> 外文期刊>Materials Chemistry and Physics >Synthesis, characterization, and thermal stability of novel poly(azomethine-urethane)s and polyphenol derivatives derived from 2,4-dihydroxy benzaldehyde and toluene-2,4-diisocyanate
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Synthesis, characterization, and thermal stability of novel poly(azomethine-urethane)s and polyphenol derivatives derived from 2,4-dihydroxy benzaldehyde and toluene-2,4-diisocyanate

机译：新型由2,4-二羟基苯甲醛和甲苯-2,4-二异氰酸酯衍生的聚（甲亚胺-氨基甲酸酯）和多酚衍生物的合成，表征和热稳定性

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摘要

Up to date, only a few kinds of poly(azomethine-urethane)s (PAMUs) were synthesized and studied with thermal degradation steps. However, polyphenol based PAMUs including azomethine linkages have not been investigated yet. The polyurethanes were prepared by condensation reaction of 2,4-dihydroxybenzaldehyde (2,4-DHBA) with toluene-2,4-diisocyanate (TD1) under argon atmosphere. Synthesized polyurethane was converted to its poly(azomethine urethane) species (TP-2AP, TP-3AP, and TP-4AP) by graft copolymerization reactions with amino phenols (2-amino phenol, 3-amino phenol, and 4-amino phenol). Obtained poly(azomethine urethane)s were converted to their polyphenol species (P-TP-2AP, P-TP-3AP, and P-TP-4AP) by oxidative polymerization reaction (OP) using NaOCl as the oxidant. The structures of the obtained compounds were confirmed by FT-IR, UV-vis,~1H NMR, and ~(13)C NMR techniques. The molecular weight distribution parameters of the synthesized compounds were determined by the size exclusion chromatography (SEC). The synthesized compounds were also characterized by solubility tests, TG-DTA, and DSC. Fluorescence measurements were carried out in various concentrated DMF solutions to determine the optimum concentrations to obtain the maximal PL intensities.
机译：迄今为止，仅合成了几种聚（甲亚胺-氨基甲酸酯）（PAMU），并通过热降解步骤对其进行了研究。然而，尚未研究基于多酚的包括偶氮甲碱键的PAMU。通过在氩气氛下使2，4-二羟基苯甲醛（2，4-DHBA）与甲苯-2，4-二异氰酸酯（TD1）缩合反应来制备聚氨酯。通过与氨基苯酚（2-氨基苯酚，3-氨基苯酚和4-氨基苯酚）的接枝共聚反应，将合成的聚氨酯转变成其聚（甲亚胺基氨基甲酸酯）物种（TP-2AP，TP-3AP和TP-4AP） 。使用NaOCl作为氧化剂，通过氧化聚合反应（OP）将获得的聚（偶氮甲碱氨基甲酸酯）转化为多酚类物质（P-TP-2AP，P-TP-3AP和P-TP-4AP）。所得化合物的结构通过FT-IR，UV-vis，〜1H NMR和〜（13）C NMR技术确认。通过尺寸排阻色谱法（SEC）确定合成的化合物的分子量分布参数。还通过溶解度测试，TG-DTA和DSC对合成的化合物进行了表征。在各种浓缩的DMF溶液中进行荧光测量，以确定获得最大PL强度的最佳浓度。

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