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aggregation behavior and structure of Associated Polyacrylamide Hydrophobically Modified with 2-Phenoxylethylacrylate

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Chemical Research in Chinese Universities 2009年第6期25卷 957-962页

作者： DAI Yu-hua WU Fei-peng LI Miao-zhen WANG Er-jian Department of Materials Science and Engineering Beijing Institute of Petrochemical Technology Beijing 102617 P. R. China Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100101 P. R. China

The aggregation behavior and structure of hydrophobically modified block copolymers of acrylamide and 2-phenoxylethylacrylate were investigated by viscometry, 1H NMR relaxation, 2D NOESY, fluorescence and dynamic light scattering. It Was found that the aggregation behavior was strongly dependent on the concentration of polymer solution and the hydrophobe contents. With varying concentration from 2.0, 6.0, 8.0 to 12.0 g/L, there were different aggregate morphologies distributed in aqueous solutions, such as monopolymer chain, micelle-like aggregate, multi-micelle aggregate and cross-linked network. According to the model of aggregation, it can give a reasonable explanation on the large magnitude enhancement of viscosity with the increasing of polymer concentration. Additional data of 2D NOESY and fluorescence show that the copolymer with higher hydrophobe content（molar fraction≥ 1%） is likely to form intra-molecular association.

关键词： aggregation behavior and structure Hydrophobically modified Copolymer P(AM/POEA)

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HYDROPHOBICALLY ASSOCIATING POLYACRYLAMIDES MODIFIED BY A NOVEL SELF-ASSOCIATIVE CATIONIC MONOMER

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Chinese Journal of Polymer Science 2010年第2期28卷 137-145页

作者：吴飞鹏 Technical Institute of Physics and Chemistry Chinese Academy of Sciences

A series of hydrophobically associating polyacrylamides modified by small amounts （〈 3 mol%） of a self- associative cationic monomer 4-（2-（acryloyloxy） ethoxy） benzyl tri-ethyl ammonium bromide （AEBA） as hydrophobe were synthesized by radical copolymerization in aqueous solutions without external surfactants. The resulting eopolymers containing a multiblock structure exhibited a high tendency for hydrophobic association and a high thickening capacity. Solution properties and aggregation structures were investigated by viscometry and fluorescence technique. The high viscosity enhancement was found as the polymer concentration beyond a critical value c＊ and strongly depended on the copolymer microstructures. The number and length of hydrophobic microblocks within the copolymer backbones could be controlled by changing the AEBA concentration in copolymerization system. Addition of salt induced more hydrophobic association and viscosity enhancement. The synthesis method used was simple and environmentally friendly without any external surfactant contamination in comparison with the conventional micellar copolymerization.

关键词： Self-associative monomer Hydrophobically associating copolymer aggregation behavior and structure Viscosity enhancement.

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