摘要
以二乙醇胺同硼酸为原料合成硼酸二乙醇胺酯,然后与十二酸甲酯及溴代十二烷合成了十二酰胺硼酸二乙醇胺酯(RNOB)和N-十二烷基硼酸二乙醇胺酯(RNB),并利用红外、元素分析和核磁对其结构进行了表征,采用了表面张力法确定了RNOB和RNB的临界胶束浓度(cmc),考察了盐度、pH对cmc的影响。结果表明:RNOB与RNB的cmc和γcmc分别为4×10-4mol/L和1 2×10-4mol/L;33 3mN/m和31 5mN/m。pH=10时,RNOB-0 1mol/LNaCl和RNB-0 1mol/LNaCl溶液的cmc比不含NaCl的小。RNOB-0 1mol/LNaCl和RNB-0 1mol/LNaCl的cmc随着PH值的下降而增加,对RNOB-0 1mol/LNaCl溶液,在pH=4时由于水解使γcmc下降。
Diethanolamine borate was prepared by using diethanolamine and boric acid as starting materials.The diethanolamine borate was used for the preparation of N-dodecyl-diethanolamine borate(RNB)by reacting with bromododecane and for the preparation of dodecanamide diethanolamine borate(RNOB)by reacting with methyl laurate.The chemical structure of the two products were identified by elemental analysis,IR-spectrum and NMR-spectrum.The critical micelle concentration(cmc)of RNB and RNOB were determined by surface tension method.The effects of salinity and pH to the cmc of the products were studied.The results show that the cmc of RNOB and RNB is 4×10^(-4) mol/L and (1.2×10^(-4) mol/L) respectively,while γ_(cmc) is 33.3 mN/m and 31.5 mN/m respectively.At pH 10,the cmc of both RNOB and RNB in solution that contains 0.1 mol/ L NaCl is lower than in solution that does not contain NaCl,and the cmc will increase following the decline of pH.At pH 4,γ_(cmc) will decrease due to hydrolysis.
出处
《日用化学工业》
CAS
CSCD
北大核心
2005年第1期12-14,18,共4页
China Surfactant Detergent & Cosmetics
