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壳聚糖 (CS)和聚丙烯酸 (PAA)在不同的 p H值下以不同的比例混合 ,当离子强度在 0 .1～ 0 .3范围内时 ,形成的聚电解质络合物 (PEC)的量通过测定悬浊液在 42 0 nm处的浊度来确定 .在 p H=2时 ,没有 PEC生成 ;在 p H=3～ 6时 ,PEC形成的最大量出现在不同的混合比处 .该范围内离子强度对 PEC的形成影响并不大 .通过对上清液 p H值的测定分析得知在 p H=3～ 5时 ,混合物的 p H值随着 PEC的生成量增大而减少 ,而在 p H≥ 6时 ,混合物的 p H值随着 PEC的生成量增大而增大 .由此可推测 PEC形成的机理是 PAA的羧基和 CS的氨基基团之间发生静电作用 ,这一点亦可通过对不溶的 PEC的红外光谱进行分析来证实 .
Chitosan (CS) and polyacrylic acid (PAA) were mixed in different proportions at different p H values, and the polyelectrolyte complex (PEC) formed when the ionic strength was in the range of 0.1-1.3. Was determined by measuring the turbidity of the suspension at 4200. No PEC was formed at p H = 2 and at p H = 3 ~ 6, the maximum amount of PEC formation occurred at different mixing ratios .The ionic strength in this range had little effect on the formation of PEC.According to the determination of the p H value of the supernatant, it was found that the p H value of the mixture increased with the increase of the PEC formation when p H = 3 ~ 5 , While the p H value of the mixture increases with increasing PEC generation when p H ≧ 6. From this it can be inferred that the mechanism of PEC formation is electrostatic charge between the carboxyl groups of PAA and the amino groups of CS This can also be confirmed by analyzing the infrared spectra of insoluble PEC.