梳型两亲聚合物的制备及其性能研究

Preparation and Properties of Comb-like Amphiphilic Polymers

摘要:

通过聚乙二醇单甲醚(MPEG)和十二醇接枝苯乙烯-马来酸酐共聚物(SMA)的方法，制备了梳型两亲聚合物SMA-g-MPEG、SMA-g-C12H25OH和SMA-g-MPEG C12H25OH，研究了其在水中的溶解性和水溶液的表面活性。利用FT-IR和1H NMR确定了其结构。水溶性测定结果表明，SMA-g-MPEG的水溶性较好，在质量浓度ρ=100 g/L时仍能形成透明溶液；SMA-g-MPEG C12H25OH的水溶性次之，在ρ≥100 g/L时会形成凝胶；SMA-g-C12H25OH的水溶性最差，在ρ≥60 g/L时便会形成凝胶。表面张力测定结果表明，25 ℃时，SMA-g-MPEG降低表面张力的能力有限，表面张力曲线上没有出现平台；SMA-g-MPEG C12H25OH的表面活性稍好一些，最后表面张力曲线上出现平台，其临界胶束浓度(CMC)为4.22 g/L，临界胶束浓度时表面张力(γCMC)为43.9 mN/m；SMA-g-C12H25OH的表面活性最好，其CMC为1.21 g/L，γCMC为33.2 mN/m。

Abstract:

Comb-like amphiphilic polymers SMA-g-MPEG, SMA-g-C12H25OH and SMA-g-MPEG C12H25OH were prepared with grafting poly(ethylene glycol)monomethyl ethers (MPEG) and laurel alcohol (C12H25OH) on poly(St-co-MA)(SMA). The results of FT-IR and 1H NMR confirmed success in the comb-like amphiphilic polymers preparation. The aqueous solubility of the as-prepared samples showed that SMA-g-MPEG could dissolved in water easily with transparent solution up to a mass concentration (ρ) of 100 g/L; the solubility of SMA-g-MPEG C12H25OH was slightly weak and a gel was formed at a concentration of 100 g/L; the solubility of SMA-g-C12H25OH was even bad and a gel was formed at a concentration of 60 g/L. Surface tension measurements indicated that at 25 ℃ the surface tension (?) of SMA-g-MPEG solution was decreased with the decrease of the concentration limitedly without the platform on the surface tension vs concentration curve; For the aqueous solution of SMA-g-MPEG C12H25OH, the surface activity was improved and its critical micelle concentration (CMC) could arrive at 4.22 g/L, in which its surface tension (γCMC) was 43.9 mN/m; SMA-g-C12H25OH gave excellent surface activity with a CMC of 1.21 g/L and a γCMC of 33.2 mN/m.