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首页> 外文期刊>Polymers >Coumarin- and Carboxyl-Functionalized Supramolecular Polybenzoxazines Form Miscible Blends with Polyvinylpyrrolidone
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Coumarin- and Carboxyl-Functionalized Supramolecular Polybenzoxazines Form Miscible Blends with Polyvinylpyrrolidone

机译：香豆素和羧基官能化的超分子聚苯并恶嗪与聚乙烯吡咯烷酮形成混溶共混物

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摘要

In this study, we synthesized a novel multifunctional benzoxazine monomer (Coumarin-COOH BZ), possessing both coumarin and COOH groups, through the reaction of 4-methyl-7-hydroxycoumarin, 4-aminobenzoic acid, and paraformaldehyde in 1,4-dioxane, with the structure confirmed using 1 H and 13 C nuclear magnetic resonance and Fourier transform infrared (FTIR) spectroscopy. Differential scanning calorimetry (DSC), FTIR spectroscopy, and thermogravimetric analysis were then employed to monitor the thermal curing behavior of Coumarin-COOH BZ and its blends with poly( N -vinyl-2-pyrrolidone) (PVP), both before and after photodimerization of the coumarin moieties. DSC revealed a single glass transition temperature for each Coumarin-COOH BZ/PVP blend composition; a large positive deviation based on the Kwei equation suggested that strong hydrogen bonding existed between the Coumarin-COOH BZ and PVP segments, confirmed through FTIR spectroscopic analyses. The thermal properties improved (i.e., increased glass transition and thermal degradation temperatures) as a result of the increased crosslinking density after photodimerization under UV exposure.
机译：在这项研究中，我们通过4-甲基-7-羟基香豆素，4-氨基苯甲酸和多聚甲醛在1,4-二恶烷中的反应，合成了同时具有香豆素和COOH基团的新型多功能苯并恶嗪单体（Coumarin-COOH BZ） ，其结构已通过1 H和13 C核磁共振和傅立叶变换红外（FTIR）光谱确认。然后在光二聚化之前和之后，使用差示扫描量热法（DSC），FTIR光谱和热重分析来监测香豆素-COOH BZ及其与聚N-乙烯基-2-吡咯烷酮（PVP）的共混物的热固化行为。香豆素部分。 DSC显示每种香豆素-COOH BZ / PVP共混物的单一玻璃化转变温度;根据FTIR光谱分析证实，基于Kwei方程的较大正偏差表明，香豆素-COOH BZ和PVP段之间存在强氢键。由于在紫外线下光致二聚后的交联密度增加，热性能得以改善（即，玻璃化转变温度和热降解温度增加）。

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