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首页> 外文期刊>Journal of Applied Polymer Science >Studies on thermal behavior of imidazole diamine based benzoxazines
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Studies on thermal behavior of imidazole diamine based benzoxazines

机译：咪唑二胺苯并恶嗪的热行为研究

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The objective of the present work is to develop a novel type of structurally modified benzoxazines with improved performance characteristics using imidazole core based diamine with formaldehyde and different types of phenolic compounds in order to utilize them for high-performance applications. In this work, an attempt has been made to bring down the polymerization temperature of the benzoxazine monomers, which is one of the most deficient factor restrict the applications of benzoxazines, when used in the form of adhesives, sealants, encapsulants, and matrices with other substrates, though they possess numerous advantages and valuable properties than those of other available thermosets. In this context, in this study, two approaches have been adopted to bring down the polymerization temperature, viz., (i) the development of structurally modified benzoxazine monomers with imidazole core and (ii) an incorporation of varying nature of chemical compounds as catalysts, to lower the polymerization temperature and to enhance the thermal stability and char yield. Three types of benzoxazines were developed using imidazole core based diamine with monohydric phenols and formaldehyde, at appropriate conditions. The molecular structure of benzoxazines was confirmed from Fourier transform infrared spectroscopy and H-1-nuclear magnetic resonance analysis. From data, it was observed that the imidazole diamine based benzoxazines prepared from 1-naphthol exhibits lower curing temperature of about 192 degrees C than that of other samples studied in this work. In addition, the influencing effect of catalysts viz., 4-hydroxy acetophenone, 4-hydroxy benzaldehyde, 4-hydroxyphenyl maleimide, and thiodipropionic acid (TPA) on thermal properties of benzoxazines also was studied. Among the catalysts, it was found that the TPA is the most efficient catalyst. In the case of imidazole diamine based benzoxazines prepared from cyanophenol, the TPA reduces value of polymerization temperature (T-p)
机译：本作工作的目的是开发一种新型的结构改性苯并恶嗪，其使用甲醛基核与甲醛和不同类型的酚类化合物具有改善的性能特征，以便利用它们进行高性能应用。在这项工作中，已经尝试降低苯并恶嗪单体的聚合温度，这是最缺乏的因子限制苯并恶嗪的应用之一，当用粘合剂，密封剂，密封剂和矩阵的形式使用时基板，尽管它们具有比其他可用热固性件的许多优点和有价值的特性。在这种情况下，在本研究中，已经采用了两种方法来降低聚合温度，Viz，（i）用咪唑核的结构改性苯并恶嗪单体的发展和（ii）掺入催化剂的不同性质，降低聚合温度并增强热稳定性和炭产率。在适当的条件下，使用咪唑核基胺与一元酚和甲醛一起使用三种类型的苯并恶嗪。从傅里叶变换红外光谱和H-1核磁共振分析证实了苯并恶嗪的分子结构。从数据中，观察到由1-萘酚制备的咪唑二胺的苯并恶嗪表现出约192℃的较低固化温度，而不是在这项工作中研究的其他样品的固化温度。此外，还研究了催化剂致催化剂的影响。，4-羟基苯酮，4-羟基苯甲醛，4-羟基苯基马来酰亚胺，4-羟基苯基苯甲酸和硫代哌啶酸（TPA）也是对苯并恶嗪的热性质的影响。在催化剂中，发现TPA是最有效的催化剂。在由Cyanophenol制备的咪唑二胺的苯并恶嗪的情况下，TPA减少了聚合温度（T-P）的值

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