热缔合型阳离子纤维素的制备及性能

Synthesis and Properties of Thermo-associative Cationic Cellulose

摘要:

通过调控纤维素衍生物亲水-亲油平衡的方法制备了热缔合型阳离子纤维素(TACC)。羟乙基纤维素(HEC)与疏水化试剂-正丁基缩水甘油醚(BGE)反应制备了疏水化纤维素(HBPEC)，进一步与阳离子化试剂-2,3-环氧丙基三甲基氯化铵(GTA)反应制备了热缔合型阳离子纤维素(TACC)。采用FTIR、1H-NMR、元素分析等对TACC进行了表征，证实了TACC上已成功接枝了BGE和GTA。研究了GTA取代度、TACC水溶液的浓度以及NaCl浓度对TACC温敏增稠性能的影响。结果表明：当GTA的取代度从0.12增加到0.32时，15 g/L的TACC水溶液的最大粘度值(ηmax)从13 mPa•s 增大到54 mPa•s，最大与最小粘度的比值(ηmax/ηmin)从1.5增加到7，与最大粘度值对应的温度(Tmax)从25 °C升高到40 °C；TACC水溶液的浓度的增大会使其粘度及温敏增稠性能提高，但Tmax不会改变；相反，NaCl浓度的增加会使TACC水溶液的粘度和温敏增稠性能降低，且会使Tmax减小。

Abstract:

Thermo-associative cationic cellulose(TACC) was synthesized by regulating hydrophilic-lipophilic balance of cellulose derivatives. Hydroxyethyl cellulose reacted with hydrophobic reagent-butyl glycidyl ether(BGE) to prepare hydrophobic cellulose, and further reacted with cationic reagent-2, 3-epoxypropyl trimethyl ammonium chloride(GTA) to prepare thermo-associative cationic cellulose(TACC). The obtained product was characterized by FTIR, 1 H-NMR and Elemental Analyses. These prove that BGE and GTA were successfully grafted onto the TACC. The influences of the degree of GTA, concentrations of TACC aqueous solution and concentrations of NaCl on the thermothickening properties of TACC were investigated. The results showed that: When the degree of GTA increased from 0.12 to 0.32, the maximum viscosity(ηmax) value of 15g/L TACC aqueous solution increased from 13 mPa•s to 54 mPa•s, the ratio of maximum and minimum viscosity(ηmax/ηmin) increased from 1.5 to 7.0, and the temperature(Tmax) corresponding to the maximum viscosity value increased from 25 °C to 40 °C; The increase of the concentration of TACC aqueous solution improved its viscosity and thermothickening properties, but the Tmax didn’t change; On the contrary, the increase of NaCl concentration reduced the viscosity and thermothickening properties, and the Tmax also reduced.