盐酸胍处理对皮胶原热降解行为的影响

Influence of Guanidine Hydrochloride on Thermal Degradation Behavior of Collagen Fibers

采用热重法(TG)和微分热重分析法(DTG)研究了经过不同浓度盐酸胍溶液处理的皮胶原纤维的热降解行为,用Horowitz-Metzger和Coats-Redfern2种方法计算,并得到了未处理皮胶原纤维和不同浓度盐酸胍溶液处理后的皮胶原纤维的热降解活化能。研究结果表明:2种方法得到的皮胶原纤维的热降解活化能相差不大,都随所使用的盐酸胍浓度的增大而逐渐减小。其可能机理为,盐酸胍分子中含有2个氨基,通过破坏皮胶原中的氢键,从而改变皮胶原的构象和聚集态结构。经过盐酸胍处理后,皮胶原纤维的结构变得不稳定,可以为随后其它材料渗透到皮胶原纤维内部,与皮胶原之间发生相互作用创造必要的条件。

Collagen fibers were processed in guanidine hydrochloride solutions of different concentrations,and the thermal deg-radation behaviors of the collagen fibers were studied and analyzed with thermogravimetry （ TG） and differential thermogravimetry analysis （ DTG） . Both methods of Horowitz-Metzger and Coats-Redfern were used to calculate the thermal degradation activation energies of collagen fibers processed in different concentrations of guanidine hydrochloride. It indicates that the differences between the thermal degradation activation energy by the two methods are little and could be neglected. The thermal degradation activation energy decreases with increasing the guanidine hydrochloride concentration. Guanidine hydrochloride process may destroy the original hydrogen bonds in collagen fibers and change their aggregation structure. After guanidine hydrochloride process,the collagen structure is unstable,which may do well in the penetration of leather chemicals to combine with collagen in leather making.