腰果基表面活性剂的合成及其表面性质

Synthesis and Surface Property of Cashew-based Surfactants

以腰果酚为起始原料,合成了中间体腰果酚聚氧乙烯醚(CPE),进而在NaOH的催化作用下,由CPE和氯乙酸合成了系列腰果酚聚氧乙烯醚羧酸盐(CPEC)。采用红外光谱和元素分析技术对产物的结构进行了表征,用表面张力法研究了CPEC的表面性能。结果表明,该表面活性剂水溶液的临界胶束浓度(CMC)为9.30、8.50、8.10和7.71mmol/L,相应的临界表面张力为28.38、28.60、30.40和30.00mN/m。根据Gibbs公式得出表面活性剂在溶液表面的最大吸附量为0.7087、0.7350、0.7195和0.7346μmol/m2,表面活性剂的最小分子截面积为2.3439、2.2600、2.3087和2.2613nm2。

Cashew phenol polyoxyethylene ethers ( CPE) were synthesized from cashew phenol as raw materials. In the presence of sodium hydroxide as a catalyst,a series of cashew phenol polyoxyethylene ether carboxylates( CPEC) were synthesized with CPE and chloroacetic acid. The products were structurally confirmed by FT-IR and elemental analysis. Surface properties were determined by a surface tension method. The experimental results showed that when critical micelle concentrations( CMC) of the surfactants were 9. 30,8. 50,8. 10 and 7. 71 mmol/L,the corresponding surface tensions at CMC were 28. 38,28. 60,30. 40 and 30. 00 mN/m,respectively. By means of Gibbs formula,the maximum adsorption amounts of the surfactants were 0. 7087,0. 7350,0. 7195 and 0. 7346 μmol/m2,and the minimal molecular projective areas of them were 2. 3439,2. 2600,2. 3087 and 2. 2613 nm2,respectively,on solution surface.