摘要
聚醚二胺与异弗尔酮二胺同为二胺,两种结构中的氨基及其邻近基团的化学环境相似,但是,二者在空气中放置后却有着明显不同的表观现象。为此,本文采用质量跟踪分析、FT-IR跟踪分析、1H-NMR分析对二者与空气之间的反应进行了研究。结果表明,随着放置时间的增长,聚醚二胺与异弗尔酮二胺的质量都有明显的增加。从FT-IR和1H-NMR结果分析,聚醚二胺在空气中放置后,结构没有明显变化,其质量的增加只是由于吸收空气中的水份而造成的;而异弗尔酮二胺在空气中放置后,结构发生很大的变化,生成了大量的羧酸盐的结构,表明其质量增加是由于与空气中的CO2反应而致。提出了导致聚醚二胺与异弗尔酮二胺的反应活性差别的主要原因是聚醚二胺形成了氢键,导致氨基活性下降,并建立了氢键模型。
It is easy to assume that the reactivity of polyethenoxyamines and isophoronediamine are similar because they are both diamines and the environment of the amino groups and their adjacent groups are similar. By chance, it was found that their appearances were quite different after exposure to the air for 48 hours and so their reactivities were studied through weight change measurements, FT-IR and ^1H-NMR spectroscopy. The weight measurements, which show an obvious increase, indicate that the two diamines have changed either chemically or physically in the air. The FT-IR and ^1H-NMR results indicate that： Firstly, the change in weight of polyethenoxyamine is only influenced by the absorption of water; Secondly, isophoronediamine reacts with water and carbon dioxide after exposure to the air, which results in the change in weight. In conclusion, the key factor in the different reactivity of polyethenoxyamine and isophoronediamine is explained by the hydrogen bonding in polyethenoxyamine formed between amino groups and the ether oxygen atoms in the main chain, which lowers the reactivity of the amine groups in polyethenoxyamine.
出处
《北京化工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第6期53-57,共5页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
