رسائل ماجيستير
English
1997
Solution behavior of hydrophobic non-ionic and ionic polymers.
Basel Abu-Sharkh, Esam Z. Hamad, سهيل شيخ
كلية الهندسة-جامعة الملك فهد للبترول والمعادن · السعودية
Water soluble polymers have gained increasing importance in recent years. Specific structural characteristics of the macromolecular backbone determine their solution properties. Viscofication of aqueous solutions can be achieved by using amphiphilic polymers i.e. water soluble polymers bearing a few hydrophobic groups. Intermolecular association between the hydrophobes leads to a substantial enhancement in viscosity. We have successfully synthesized hydrophobically modified poly (vinyl alcohol) and block copolymers of acrylamide and styrene by micellar copolymerization. A substantial enhancement in viscosity and thickening properties equivalent to those of very high molecular weight polymers have been noticed for the polymers under study. Furthermore, the reversible association -dissociation process gives rise to a shear thinning behavior which is desired in water based systems involving a viscosity control. Salt interactions have been studied. Surface tension and inerfacial tension measurements have been made. Polymer characterization is done using fluorescence measurements and NMR spectroscopy.