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Improved curing reactivity, thermal resistance and mechanical properties of furylamine-based benzoxazine using melamine as an amine source
Polymers for Advanced Technologies ( IF 3.4 ) Pub Date : 2022-12-28 , DOI: 10.1002/pat.5967
Jiajia Ye, Zilin Fan, Shuai Zhang, Xiaobo Liu

Benzoxazine resin is known as a high-performance thermosetting resin, but the relatively high curing temperature and low cross-linking density limit its broad application. The furylamine based benzoxazines possess great comprehensive performances and show great potential as bio-based materials. In this work, the benzoxazine precursors (BAfa-ma) containing furylamine were synthesized by using melamine as diamine to promote the curing reactivity and thermal resistance of furylamine based benzoxazines. The Fourier transform infrared (FT-TR) and proton nuclear magnetic resonance (1H NMR) spectroscopy were used to confirm the chemical structures of BAfa-ma, and differential scanning calorimetric (DSC), and thermogravimetric analysis (TGA) were applied to verify the curing behavior and performance of obtained polymers. It is showed that there are less benzoxazine rings in BAfa-ma as more melamine introduced, on the contrary, more phenolic hydroxyls and secondary amines appeared as built-in catalysts. What's more, BAfa-ma have higher reactivity, shorter gelation time and lower curing temperature. Additionally, more melamine would lead to higher crosslinking density and higher thermal resistance, poly(BAfa-70ma) shows Tg up to 318.6 and 76.4°C higher than that of poly(BAfa). Moreover, the mechanical and dielectric properties of the corresponding glass fiber reinforced composites laminates are also investigated, and it is found that proper amount of melamine may be beneficial for higher mechanical strength.

中文翻译:

以三聚氰胺为胺源提高呋喃胺基苯并恶嗪的固化反应性、耐热性和机械性能

苯并恶嗪树脂被誉为高性能热固性树脂,但相对较高的固化温度和较低的交联密度限制了其广泛应用。呋喃胺基苯并恶嗪具有良好的综合性能,显示出作为生物基材料的巨大潜力。在这项工作中,通过使用三聚氰胺作为二胺合成含有呋喃胺的苯并恶嗪前体 (BAfa-ma),以提高基于呋喃胺的苯并恶嗪的固化反应性和耐热性。傅里叶变换红外 (FT-TR) 和质子核磁共振 ( 1H NMR)光谱用于确定 BAfa-ma 的化学结构,差示扫描量热法(DSC)和热重分析法(TGA)用于验证所得聚合物的固化行为和性能。结果表明,随着三聚氰胺的引入,BAfa-ma中的苯并恶嗪环较少,相反,更多的酚羟基和仲胺作为内嵌催化剂出现。此外,BAfa-ma 具有更高的反应活性、更短的胶凝时间和更低的固化温度。此外,更多的三聚氰胺会导致更高的交联密度和更高的耐热性,聚(BAfa-70ma)显示T g比聚 (BAfa) 高 318.6 和 76.4°C。此外,还研究了相应玻璃纤维增​​强复合材料层合板的力学和介电性能,发现适量的三聚氰胺可能有利于提高机械强度。
更新日期:2022-12-28
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