环氧树脂改性小桐子蛋白基胶粘剂的制备机理及热性能分析

Analysis of preparation mechanism and thermal properties of epoxy resin modified jatropha curcas protein-based adhesives

以ECH(环氧氯丙烷)作为EP(环氧树脂)的模型化合物、氨基酸[如Ser(丝氨酸)、Glu(谷氨酸)或Ala-Gln(L-丙氨酰-L-谷氨酰胺)等]作为小桐子蛋白的模型化合物,通过模型化合物间的反应来研究EP改性小桐子蛋白基胶粘剂的反应机理。研究结果表明:ECH与3种氨基酸(如Ser、Glu和Ala-Gln)中的游离氨基都能发生取代反应,但与羧基和羟基之间无明显的反应(不排除参与后期固化反应的可能);就3种氨基酸(如Ser、Glu和Ala-Gln)中的氨基与ECH的反应产物(反应程度依次减小)而言,前者主要是N-2取代物,而后两者主要是N-1取代物。小桐子蛋白基胶粘剂的固化温度和热稳定性均高于大豆蛋白基胶粘剂。

With ECH(epoxy chloropropane)as model compound of EP(epoxy resin),some amino acids[suchas Ser(serine),Glu(glutamic acid)or Ala-Gln(L-alanyl-L-glutamine)] as model compounds of jatropha curcas,the reaction mechanism of EP modified jatropha curcas protein-based adhesive was investigated by reactionbetween model compounds.The research results showed that the replace reaction between ECH and free-amino inthree amino acids(such as Ser,Glu or Ala-Gln)could be happened,but the reactions among ECH,carboxyl groupsand hydroxyl groups were not obvious which groups may participate in the latter curing reaction.For reactionproducts between ECH and free-amino in three amino acids(such as Ser,Glu or Ala-Gln)which reaction degreewas successively decreased,the former is mainly N-2 substituendum,but the latter both are mainly N-1 substituendum.The curing temperature and thermal stability of jatropha curcas protein-based adhesive were morethan those of soy protein-based adhesive.