疏水改性聚丙烯酰胺的增粘机理研究

The Thickeninq Mechanism Study of Hydrophobically Modified Polyacrylamide

通过与聚丙烯酰胺(PAM)对比,使用荧光光谱、紫外光谱、原子力显微镜以及流变性实验对疏水改性聚丙烯酰胺(HMPAM)的溶液行为和微观结构进行了研究。通过荧光实验I_3/I_1值的变化确定了HMPAM的临界缔合浓度。结合荧光、紫外及流变性实验,对HMPAM在溶液中通过疏水缔合形成疏水微区、超分子聚集体及发展到空间网络的结构变化进行了研究。用原子力显微镜证实了HMPAM溶液中网络结构的存在。对HMPAM表现出的特殊流变性从微观上找到了依据,提出了HMPAM的增粘机理。

Hydrophobically modified polyacrylamide (HMPAM) has been synthesized. The behavoir and microstructure of HMPAM in aqueous solution, compared with polyacrylamide (PAM) have been studied by means of fluorescence and UV spectra, atomic force microscope and apparent viscosity test. The critical association concentration of HMPAM has been determined by the change of the value of I-3/I-1 of the fluoresence spectra. The results of fluorescence, UV and viscosity test show that with the increase of HMPAM concentration, hydrophobic domain, supermolecular aggregate and even space network structure can be formed in the solution by the hydrophobic association of HMPAM. The latter has been further confirmed by atomic force microscope. A mechanism for the increase of the viscosity of HMPAM solution has been suggested.