丙烯酸-丁烯醛共聚物与明胶相互作用的研究

Study on the Interaction between Poly (Acrylic acid-crotonaldehyde) and Gelatin

以明胶为皮胶原的模型化合物,采用紫外-可见光谱、FT-IR光谱、DSC等表征方法,研究了丙烯酸-丁烯醛共聚物与明胶的相互作用,并对其作用机理进行了探讨。试验结果表明:丙烯酸-丁烯醛共聚物与明胶间的相互作用是共价键、侧基-侧基库仑作用和多点氢键的协同作用。共价键增加了明胶的热稳定性,而在丙烯酸-丁烯醛作用后,明胶的变性温度也升至15·4℃,其中的侧基-侧基库仑作用方式、大小与介质的pH值有关,静电吸引力在pH值为4·5附近为最大,静电排斥力在pH值大于7时为最大。

The interaction between poly （acrylic acid crotonaldehyde） and gelatin, in which gelatin was used as the model ot collagen, was studied using FT - IR, UV and DSC. The results show that there are covalent bond, side group - side group interaction and hydrogen bond between Poly （acrylic acid- crotonadehyde） and gelatin. The covalent crosslink between P （acrylic acid-crotonaldehyde） and gelatin, which is got from the aldehyde group in P （acrylic acid- crotonaldehyde） and amino group in gelatin testified by IR, UV and DSC, improves the thermal stability of gelatin. The thermal denatured temperature of gelatin, which interacted with P（acrylic acid- crotonaldehyde）, rises as high as 15.4℃ . And the degree of side group - side group interaction between gelatin and P （acrylic acid- crotonaldehyde） is relative to pH. The affinity is biggest at the pH：4.5, while the repulsive force is biggest when the pH is bigger than 7.