ω-氨基酸缩聚反应动力学研究

前曾报导9-氨基壬酸的缩聚,从开始到反应程度p增加到99％左右时止,均遵循二级反应。在这以后,由于体系粘稠的影响,迅速转为三级反应。本文报导在6-氨基己酸和11-氨基十一酸缩聚时,也出现同样现象,即在p逐渐到高于99％左右时,反应从二级转变为三级。可以说这一现象是AB型单体聚酰胺化的一般规律,从而澄清了文献中对这一问题的不同论点。

RESEARCH ON THE POLYCONDENSATION KINETICSOF ω-AMINOAClDS

In our previous report, it was discovered that the polycondensation reaction of 9-amino-pelargonic acid followed second order kinetics from the beginning up to an extent of reaction, p, about 99%, after that, the system became very viscous, the reaction changes rapidly to a third order kinetics In this paper, we wish to report that, this change of the reaction order from second to third occured also in the polycondensation of 6-amino-caproic acid and 11-amino-undecanoic acid. The transition regions lie again at p about 99%.From these results,it may conclude that this is a general rule in the polyamidation of the w-amino-acid (monomers of the AB type),and the contradictory results appeared in literature in this fi-eld may be settled by our experiment.