Synthesis of a benzoxazine with precisely two phenolic OH linkages and the properties of its high-performance copolymers
作者:Ching Hsuan Lin、Yu Ren Feng、Kang Hong Dai、Hou Chien Chang、Tzong Yuan Juang
DOI:10.1002/pola.26661
日期:2013.6.15
resulting imine linkage by sodium borohydride, and (c) ring closure condensation by formaldehyde. The key starting material, (1), was prepared from 2‐hydroxybenzaldehyde and s‐trioxane in the presence of sulfuric acid. F‐ap is structurally similar to bis(3,4‐dihydro‐2H‐3‐phenyl‐1,3‐benzoxazinyl)methane (F‐a, a commercial benzoxazine based on bisphenol F/aniline/formaldehyde) except for two phenolic OHs. The
在我们的替代合成方法中,已经成功地制备了无法通过传统方法由双酚F,氨基酚和甲醛缩合直接合成的含酚OH的苯并恶嗪(F-ap)。F-ap通过三个步骤制备,包括(a)4-氨基苯酚与5,5'-亚甲基双(2-羟基苯甲醛)的缩合(1),(b)硼氢化钠还原所得亚胺键和(c)甲醛引起的闭环缩合。关键的起始原料(1)是由2-羟基苯甲醛和s-三恶烷在硫酸存在下制备的。F-ap在结构上与bis(3,4-二氢-2H-3H-苯基-1,3-苯并恶嗪基)甲烷(F-a,商用苯并恶嗪(基于双酚F /苯胺/甲醛),但不含两种酚OH。酚羟基可以提供与环氧和1,1'-(亚甲基二-对亚苯基)双马来酰亚胺(BMI)的反应部位。讨论了F-ap /环氧,F-a /环氧,F-ap / BMI和F-a / BMI的热固性之间的结构-性质关系。实验数据表明,基于F-ap /环氧树脂和F-ap / BMI的热固性材料比基于F-a /环氧树脂和F-a