PMTFPSb-PEO-b-PMTFPS含氟三嵌段共聚物的合成及其溶液性质研究

Synthesis and solution properties of PMTFPS-b-PEO-b-PMTFPS triblock copolymers

通过阴离子开环聚合制备了Si-H封端聚[1,3,5-三甲基-1,3,5(3,3,3-三氟丙基)硅氧烷](PMTFPS)大分子单体,进而与双烯丙基聚氧乙烯醚(PEO)进行硅氢加成反应合成了不同亲水/疏水嵌段比例的PMTFPS-b-PEO-b-PMTFPS三嵌段共聚物。分别利用GPC和1H-NMR等手段表征了嵌段共聚物的结构组成,测定了不同结构嵌段共聚物的平衡表面张力及临界胶束浓度(cmc)。研究表明,当疏水嵌段链长一定时,临界胶束浓度(cmc)值随聚醚嵌段的增长而下降;当聚醚嵌段长度一定时,cmc值不随疏水嵌段长度的变化而变化。

A series of new amphiphilic poly[methyl（3,3,3-trifluoropropyl） siloxane]-b-poly（ethylene oxide）-b-poly[methyl（3,3,3-trifluoropropyl） siloxane]（PMTFPS-b-PEO-b-PMTFPS） triblock copolymers with different ratios of hydrophobic to hydrophilic segments were synthesized via coupling of end-functionalized PMTFPS and PEO homopolymers.1H-NMR and GPC were used to identify the structure of PMTFPS-b-PEO-b-PMTFPS.The equilibrium surface tension γ and aggregation behavior of PMTFPS-b-PEO-b-PMTFPS in aqueous solutions were investigated by tensiometry.The critical micelle concentration（cmc） value of the surfactants decreased with increasing block length of the hydrophilic part,while stayed stable with changing block length of the hydrophobil part.