反气相色谱法测定苯乙烯-氧乙烯-苯乙烯三嵌段聚合物的表面能

Determination of Surface Energy of PS-PEO-PS Triblock Copolymers by Inverse Gas Chromatography

采用反气相色谱法测定了苯乙烯 氧乙烯 苯乙烯三嵌段聚合物 (PS PEO PS)的色散成分的表面能 (γsd) ,研究探讨了温度及嵌段聚合物链段结构组成对γsd 的影响 ,并确定了γsd 与温度的数学关系式。研究结果表明 :在 70℃～ 12 0℃范围内 ,PS PEO PS的表面能较低 ;随着PS PEO PS表面组成中氧乙烯 (EO)成分的增加 ,色散成分的γsd 增大 ,且对温度的变化极其敏感 :随温度的升高 ,γsd 急剧地呈线性下降。

The surface energy( γ s d) of the dispersive component of the triblock copolymers, poly(styrene) poly(ethylene oxide) poly(styrene)(PS PEO PS),was determined by using inverse gas chromatography(IGC) A series of linear alkanes were used to determine the free energy of adsorption ( ΔG CH 2 ) of a CH 2 group in a temperature range of 70 ℃ 120 ℃, and γ s d of PS PEO PS were calculated The effects of the polymer composition and temperature on γ s d values were discussed IGC data indicated that γ s d values of PS PEO PS were lower ( γ d PS PEO PS 1 =16 99 mJ·m -2 , γ d PS PEO PS 2 =17 98 mJ·m -2 , 70 ℃) than that of PEG ( γ d PEG =21 74 mJ·m -2 ,70 ℃), and increased as the ethylene oxide content increased in PS PEO PS The γ s d was sensitive to temperature, decreased sharply with the increase of temperature Linear relationships were obtained between the γ s d and temperature ( t ,℃), which were γ d PS PEO PS 1 =28 12-0 161 t and γ d PS PEO PS 2 =28 23-0 148 t .