亚甲基二甲胺盐酸盐淀粉醚的制备及其吸湿保湿性能研究

Preparation and miosture-adsorption and retention ability investigation of starch–methylene dimethylamine hydrochloride

摘要:

摘要：以淀粉为母体，羟甲基二甲胺盐酸盐(HMMAHC)为醚化剂，通过干法工艺合成出不同取代度（DS）的叔胺型阳离子淀粉 – 亚甲基二甲胺盐酸盐淀粉醚(SMMAHC)。并对其吸湿、保湿性能进行研究。结果表明，该阳离子淀粉的吸湿、保湿性能均随着阳离子基团取代度的增加而增强。在相对湿度（RH）为81 %条件下，当阳离子取代度分别为0.36和0.70时，其吸湿性分别与透明质酸（HA）和丙三醇相当。而取代度为0.70的SMMAHC保湿性在相对湿度43%和15 %下均与透明质酸相当，优于丙三醇。并探讨了SMMAHC吸湿动力学，研究结果表明其吸湿性能可应用伪二级吸附动力学模拟方程很好的描述，相关系数达到0.999以上。

Abstract:

Abstract: A tertiary amine type cationic starch – starch–methylene dimethylamine hydrochloride (SMMAHC) with different degree of substitution (DS) was prepared by the reaction of corn starch with cationic reagent hydroxymethyl dimethylamine hydrochloride (HMMAHC) using dry process. The moisture-adsorption and retention ability was investigated. The results showed that the moisture-adsorption and retention ability of cationic starch increased with DS of cationic groups. Under the condition of relative humidity (RH) 81%, when the DS of cationic starches were 0.36 and 0.70, their moisture-adsorption abilities were equal to them of hyaluronic acid (HA) and glycerin respectively. At RH 43% and 15%, the moisture-retention ability of SMMAHC with DS of 0.70 was equal to hyaluronic acid, surpurior than glycerin. Moisture absorption kinetics of SMMAHC was preliminary studied, the pseudo-second order model of adsorption kinetic equation can characterize the adsorption process verywell and the relation coefficients are all higher than 0.999.