疏水化水溶性两性纤维素接枝共聚物CGAO的合成及其水溶液的粘度性能

Synthesis and Viscosity Properties of Aqueous Solution of Graft Copolymers CGAO of Hydrophobically Modified Water-Soluble Amphoteric Cellulose

通过丙烯酰胺（AM）及甲基丙烯酰氧乙基二甲基辛基溴化铵（ADMOAB）与羧甲基纤维素钠（Na－CMC）进行接枝共聚制备了疏水化水溶性两性纤维素接权共聚物（CGAO）。用红外光谱与元素分析对CGAO的组成进行了分析。考察了CGAO的组成、浓度及无机盐对其水溶液粘度行为的影响。发现组成对粘度有直接的影响；水溶液粘度随共聚物的浓度增加而增大存在一临界聚合物浓度（cp），cp与其组成紧密相关；在低的无机盐浓度时，溶液的粘度随无机盐浓度增加而降低，进一步增加无机盐浓度时，溶液粘度随无机盐浓度增加而提高，显示出了这种疏水化水溶性两性聚电解质特有的耐盐增粘性能。

Graft copolymer (CGAO) of sodium carboxymethyl cellulose with acrylamide andmehacryloxyethyldimethyloctylammonium bromide was first synthesized utilizing potassium persul-fate and tetramethylethylenediamine as initiators in aqueous solution at 40℃ for 4 to 6 h. CGAOwas identified by FTIR and elemental analysis. Effects of concentration and structure of CGAO andadded salt on the aqueous solution viscosity were investigated.The preliminary findings are as fol-lows: in comjparison with unmodified parent polymers, there is a critical copolymer concentration onviscosity increasing with concentration augmentation,viscosities of aqueous CGAO solution weresignificantly increased with the increment of the added salt over certain concentration, i. e, viscosi-ty behaviors of CGAO are of intensive anti-polyelectrolyte effect.