梳状两亲型SMA衍生物的制备及其表面活性

Preparation and Surface Activity of Comb-like Amphiphilic SMA Ramification

摘要:

本文通过脂肪醇醚对苯乙烯-马来酸酐共聚物（SMA）进行酯化接枝改性，制备了系列梳状两亲型SMA衍生物。即SMA-g-O-3、SMA-g-O-6、SMA-g-O-10、SMA-g-O-15和SMA-g-O-20。通过测定反应体系中酯化反应物SMA和酯化产物的酸值的变化可确定酯化反应率，其酯化率都在90%以上，且随脂肪醇醚中EO加合数的减少，酯化率相应增加，最高达到95.62%；对酯化物的水溶性及其水溶液的表面活性的研究结果表明：SMA-g-O-20的水溶性较好；25℃时，SMA钠盐水溶液降低表面张力能力有限，表面张力曲线上没有出现拐点，而改性后的SMA衍生物表面活性有较大的提高，其中SMA-g-O-15水溶液的表面活性最好，其水溶液的CMC值为0.0078g/L，γCMC为26.31mN/m。

Abstract:

The comb-like amphiphilic SMA ramification, SMA-g-O-3、SMA-g-O-6、SMA-g-O-10、SMA-g-O-15 and SMA-g-O-20, were prepared by graftying aliphatic alcohol ether onto SMA. The esterification rate was confirmed by measuring the changes of SMA and esterification product acid value. And the best conversion is over 90%. The esterification rate can reach 95.62% as the reduce of EO in aliphatic alcohol ether; The water-solubility and solution surface activity of those esterfied polymers were studied systematically by measuring the worthy before and after being esterfied, and calculating the esterification rate. The results show that the water–solubility of SMA-g-O-20 was better that others; the surface tension of sodium SMA aqueous solution decreased with the decrease of the mass concentration at 25℃, without forming a inflection point on the curve of the surface tension vs. mass concentration; however, the surface activity of motified SMA ramification is improved greatly ; SMA-g-O-15 aqueous solution exhibits excellent surface activity with a CMC of 0.008g/L and a γCMC of 26.31mN/m.