甲基环戊二胺型苯并噁嗪合成及其与环氧树脂固化体系热稳定性的比较

Preparation of benzoxazine based on methylcyclopentyl diamine and comparison of thermal stability of its curing system with epoxy

分别用苯酚（Ph）和壬基酚（NP）与多聚甲醛,对甲基环戊二胺（TAC）进行曼尼希反应,制备出来两种不同结构的甲基环戊二胺型苯并噁嗪分别简称为 TPBZ、TNBZ,然后将两种苯并噁嗪与环氧树脂共混固化并和原料TAC与环氧树脂共混固化比较.用FT-IR、1 H NMR分析了两种苯并噁嗪的化学结构；用DSC对共混固化体系特性进行研究,用 TGA 分析了固化物的热稳定性.结果表明,固化物 TPBZ/EP 的热分解温度比固化物TAC/EP提高32℃,最大失重速率温度提高58℃,700℃残炭率提高11．2％,固化物 TNBZ/EP 的热分解温度比固化物TAC/EP提高42℃,最大失重速率温度提高56℃.

Two different containging-cyclopentana benzoxazine （abbreviated as TPBz and TNBz）were synthe-sized in this paper,and the raw material phenol （Ph）and nonylphenol （NP）were used to take the Mannich re-action with paraformaldehyde and methylcyclopentyl diamine （TAC）,respectively.The chemical structure of TPBz and TNBz was characterized by FT-IR and 1 H NMR.Then blending TPBz and TNBz with epoxy resin and curing,which were compared with the blend curing system of material TAC and epoxy resin.The blend charac-teristics of curing system were studied by DSC,and the thermal stability of which was analyzed by TGA.The result demonstrated that the thermal decomposition temperature of TPBz/EP increased 32 ℃ than that of TAC/EP.the temperature of maximum weight loss rate increased 58 ℃,and the carbon residue at 700 ℃ increased 11.2%,respectively.About TNBz/EP,its thermal decomposition temperature increased 42 ℃,and temperature of maximum weight loss rate increase 5 6 ℃.