两亲性羟乙基纤维素的合成及溶液性质

选择羟乙基纤维素(HEC)作为两亲性聚合物主体,合成具有两亲性的活性单体二甲基十四烷基环氧丙烷氯化铵(M EQ),采用大分子反应法,制备出具有不同增粘性能和表面活性的羟乙基纤维素(M EQHEC)。系统地对M EQHEC的溶液性质进行了研究,包括增粘性、盐敏性、温敏性、流变性、表面活性等,并采用荧光光谱和原子力显微镜(AFM)分析对聚合物在溶液中超分子聚集形态进行了探索研究。

Synthesis and Solution Behavior of Amphiphilic Hydroxyethyl Cellulose

Amphiphilic monomer(MEQ) was prepared by the quarterisation reaction of N,N-dimethyl-n-tetradecylamine and epichlorohydrin,which displayed surface active due to the hydrophilic and hydrophobic groups on its molecules.Through the macromolecular reaction method,a series of(amphiphilic) hydroxyethyl cellulose(MEQHEC) were prepared.The solution behaviors of MEQHEC was systematically studied,including the viscosification properties,viscosity-temperature relationship,viscosity-electrolyte relationship and the steady rheological behavior.Amphiphilic structure of MEQHEC molecules is contributed to the surface activity of MEQHEC,which led to the decrease of the surface tension with the increase of the polymer concentration and MEQ content of the polymer.Atomic force microscope (AFM) and fluorescence spectrum measurement were applied to study the formation of the supramolecular aggregations of MEQHEC.At high polymer concentration,the much regularly arranged and stick-like aggregations can be formed in NaCl aqueous solution,which size increased with the increase of NaCl concentration.The stick-like micelles resultes from the amphiphilic structure of the polymer molecules.