1. 1. 2. 3. © Influence Of Hydrophobe Content On The Solution Rheology Of Hydrophobically Modified Terpolymer Of SO2, N,N-Diallyl-N-Carboethoxymethylammonium Chloride Hussein, IA; Mozumder, MS; Abu Sharkh, BF; Ali, SA; Al-Naizy, R PERGAMON-ELSEVIER SCIENCE LTD, EUROPEAN POLYMER JOURNAL; pp: 2472- 2482; Vol: 41 King Fahd University of Petroleum & Minerals http://www.kfupm.edu.sa Summary Rheological properties of hydrophobically modified copolymer of SO2, N,N-diallyl- N-carboethoxymethylammonium chloride and the hydrophobic monomer N,N-diallyl- N-octadecylammonium chloride were studied. The influence of hydrophobe content (HP) and polymer concentration was investigated. Polymers with HP content in the range 1.5-5% were examined and the concentration was varied in the range 2-5 wt%. Both dynamic and steady-shear experiments were performed in ARES rheometer. Copolymers were observed to exhibit typical viscoelastic behavior even with low HP content. Both the dynamic viscosity, eta' and storage modulus, G', increase with the increase of both the polymer concentration and the HP content of the system. The viscosity of the high HP content polymer showed a strong shear dependency, while G' was a weak function of frequency and gel-like behavior was observed. The zero-shear viscosity, eta(0), showed a strong concentration dependency (eta(0) similar to phi(alpha); 1.1 < alpha < 5.9). The concentration dependency of eta(0) suggests that intermolecular association is dominant in the high HP content polymer. Control of the HP content and polymer concentration of this class of polymers can lead to a wide range of interesting rheological properties. (c) 2005 Elsevier Ltd. All rights reserved. References: ABDALA AA, 2003, J RHEOL, V47, P497, DOI 10.1122/1.1545076 ALI SA, 1997, POLYMER, V38, P3385 ARMENTROUT RS, 2000, MACROMOLECULES, V33, P419 Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa

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3. 43. © YE L, 2004, COLLOID POLYM SCI, V282, P305, DOI 10.1007/s00396-003- 0935-9 44. ZHUANG DQ, 2002, POLYMER, V43, P2075 For pre-prints please write to: ihussein@kfupm.edu.sa Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa