表面活性剂对纤维素接枝共聚物溶液粘度性质的影响

研究了阴离子十二烷基硫酸钠(SDS)、阳离子十六烷基三甲基溴化铵(CTAB)和非离子聚乙二醇辛基苯基醚(OP)等三种不同类型的表面活性剂对疏水化水溶性两性纤维素接枝共聚物(CGAO)溶液粘度性质的影响.结果表明,在SDS和OP的临界胶束浓度(cmc)附近，CGAO溶液粘度最大，SDS引起CGAO粘度的变化大于OP；即使在CTAB的cmc附近，随着CTAB浓度的增加，CGAO的粘度一直呈下降趋势；非疏水改性的纤维素接枝共聚物的溶液粘度随SDS或CTAB浓度的增加而下降，但几乎不随OP浓度的增大而变化.此外，通过凝胶渗透色谱法测得的保留时间证实了SDS、CTAB和OP与CGAO之间的疏水缔合作用.

Influence of Surfactants on Solution Viscosity of Cellulosic Graft Copolymer

Influence of different surfactants，such as anionic sodium dodecylsulfate(SDS)，cationic cetyltrimethylammonium bromide(CTAB), and non ionic octylphenyl poly(ethylene glycol)(OP)upon water solution viscosity(η) of the hydrophobically modified water soluble amphoteric cellulosic graft copolymer(CGAO) of carboxymethyl cellulose(CMC) grafted with acrylamide(AM) and (methacryloxyethyl)dimethyloctylammonium bromide(ADMOAB) has been investigated. It was found that the maximum(ηmax) of solution viscosity of CGAO was obtained in the neighborhood of the critical micelle concentration of SDS and OP at 10 s－1 of shear rate and 25 ℃. ηmax in the presence of SDS was much larger than that in the presence of OP； and the higher the content of ADMOAB of hydrophobe in CGAO, the larger ηmax was. In the case of CTAB, η continuously decreased with the increment of CTAB concentration. However, for non hydrophobically modified graft copolymer(CGA) of CMC with AM, its η reduced with the increasing concentration of SDS or CTAB, but η was almost independent of OP. And the hydrophobic association between surfactants and CGAO was demonstrated by the retention time measured through gel permeation chromatography.