二胺型苯并噁嗪化合物的合成、结构表征与热性能分析

Analysis of Synthesis,Structure Characterization and Thermal Properties of Diamin Type Benzoxazines

以三种酚类化合物、4,4’-二氨基二苯砜和甲醛为原料,以二氧六环为溶剂制备了化学结构不同的噁嗪化合物,分别为3,3’-二苯砜-双(3,4+二氢-2H-1,3-萘并噁嗪)、3,3’-二苯砜-双(3,4-二氢-2H-1,3-苯并噁嗪)、3,3’-二苯砜-双(6-苯基-3,4-二氢-2H-1,3-苯并噁嗪)。并用1H NMR、FTIR方法确定了其化学结构。采用示差扫描量热分析(DSC)对噁嗪化合物的热行为和性能进行了分析。结果表明,不同化学结构的噁嗪化合物固化产物的热性能不同,3,3’-二苯砜-双(3,4-二氢-2H-1,3-苯并噁嗪)的固化产物具有相对较高的Tg,为212.10℃。

New diamin type oxazine mononers, such as 3,3 ＇ -diphenylsulfone-bis （3,4-dihydro-2H-1,3- naphthoxazine）, 3,3 ＇-diphenylsulfone-bis （3,4-dihydro-2H-1,3-benzoxazine）, and 3,3 ＇-diphenylsulfonebis （6-phenyl-3,4-dihydro-2H- 1,3-benzoxazine） were synthesized by using three different phenols, diamines and formaldehyde in 1,4-dioxane, and characterized by ^1H NMR and FTIR in this paper. Thermal behaviors of oxazines with different chemical structures were investigated by using Differential Scanning Calorimetry（DSC）, and results show that oxazines with different chemical structures have different thermal behaviors. It is found that the cured products of 3,3＇-diphenylsulfone-bis（3,4-dihydro-2H-1,3- benzoxazine） has higher glass transition temperatures, and the value of which is 212.10 ℃.