聚氨酯改性聚砜的合成及性能研究

用双酚A(Bis-A)和4,4′-二氯二苯砜(DCS)合成羟基封端的聚砜预聚体,用甲苯二异氰酸酯(TDI)、聚丙二醇(PPG)、2,2-双(羟甲基)丙酸(DMPA)合成异氰酸酯基封端的聚氨酯预聚体,再将两种预聚体共聚,制备出了改性聚砜.通过改变原料配比、浓度、反应温度和反应时间,测定产物的特性黏度,确定出了共聚改性的最佳条件为:反应温度80℃、反应时间6h,聚砜预聚体和聚氨酯预聚体质量比4∶1.将改性共聚物通过相转变法制备成超滤膜,测试膜的机械性能、分离性能以及抗污染性能.经测试改性聚砜膜,相比未改性膜,其断裂伸长率提高3.9%,抗张强度减少1.75N/mm2,纯水通量提高4.36mL·cm-2·h-1,水接触角减少13.2°,蛋白吸附量减少71.9μg/cm2.

Synthesis and performance research of polysulfone modified with polyurethane

Hydroxy-terminated polysulfone prepolymer was synthesised by bisphenol A （Bis-A ） and 4 ,4′-dichlorodiphenyl sulfone （DCS ） .Isocyanate-terminated polyurethane prepoly-mer was synthesised by tolylene-2 ,4-diisocyanate （TDI） ,polypropylene glycol （PPG） and 2 , 2-bis（hydroxymethyl）propionic acid （DMPA） .The modified polysulfone was synthesised by copolymerizing of two prepolymer .By changing the copolymerization temperature ,the raw material ratio and time ,we found that when the reaction temperature was 80 ℃ ,the reaction time was 6 hours ,and the ratio of polysulfone/polyurethane was 4∶1 ,the intrinsic viscosity of the modified polysulfone reached max .The modified copolymer membrane was prepared by immersing the phase transition .The mechanical properties ,separation performance and anti-pollution performance of modified membrane was tested .Compared to unmodified mem-branes ,modification membrane had better flexibility and anti-fouling performance：elonga-tion at break increased 3 .9 percent ;tensile strength decreased 1 .75 N/mm2 ;pure water flux increased 4 .36 mL · cm -2 · h-1 ;the water contact angle decreased 13 .2 °;protein adsorption decreased 71 .9 μg/cm2 .