【摘要】 以羟乙基纤维素（HEC）、正丁基缩水甘油醚（BGE）和2,3-环氧丙基三甲基氯化铵（GTA）为原料,通过改变纤维素衍生物亲水基和疏水基的比例调控亲水-亲油平衡的方法制备了热缔合型阳离子纤维素（TACC）。首先,HEC与BGE反应制备了疏水化纤维素（HBPEC）;然后,HBPEC与不同质量的GTA反应制备了4种不同GTA取代度的热缔合型阳离子纤维素（TACC）。采用FTIR、¹HNMR、元素分析对TACC进行了表征,证实TACC上已成功接枝了BGE和GTA。考察了GTA取代度、TACC质量浓度、NaCl浓度及剪切速率对TACC温敏增稠性能的影响。结果表明:40℃下,当GTA的取代度从0.12增加到0.32时,15 g/L的TACC水溶液的最大黏度(η_max)从13 mPa·s增大到54 mPa·s,最大与最小黏度比(η_max/η_min)从1.5增加到7.0,与最大黏度对应的温度(T_max)从25℃升高到40℃;TACC浓度的增大使水溶液黏度及温敏增稠性能提高;相反地,NaCl浓度的增加会使TACC水溶液的黏度和温敏增稠性能降低,且会使T_max减小。更多还原

【Abstract】 Hydroxyethyl cellulose（HEC）, butyl glycidylether（BGE） and 2,3-epoxypropyl trimethyl ammonium chloride（GTA） were used as raw materials to synthesize thermo-associative cationic cellulose（TACC） by changing the ratio of hydrophilic and hydrophobic groups of cellulose derivatives to adjust the hydrophilic-lipophilic equilibrium. Firstly, HEC reacted with hydrophobic reagent BGE to prepare hydrophobic cellulose（HBPEC）, and further reacted with cationic reagent GTA of different mass to prepare four kinds of thermo-associative cationic cellulose（TACC） with different degrees of substitution of GTA.The obtained products were characterized by FTIR, ¹HNMR and elemental analyses.The results showed that BGE and GTA were successfully grafted onto TACC. The influences of substitution degree of GTA,mass concentration of TACC,concentration of NaCl and the shear rate on the thermothickening properties of TACC were investigated.The results showed that when the substitution degree of GTA increased from 0.12 to 0.32 at 40 ℃, the maximum viscosity(η_max) value of 15 g/L TACC aqueous solution increased from 13 m Pa·s to 54 mPa·s, the ratio of maximum and minimum viscosity(η_max/η_min) increased from 1.5 to 7.0, and the temperature corresponding to the maximum viscosity(T_max) increased from 25 ℃ to 40 ℃. The increase of TACC concentration inaqueous solution enhanced its viscosity and thermothickening properties. On the contrary, the increase of NaCl concentration reduced the viscosity and thermothickening properties of TACC aqueous solution, and decreased T_max.更多还原