Aggregation Behavior and Structure of Associated Polyacrylamide Hydrophobically Modified with 2-Phenoxylethylacrylate

Chemical Research in Chinese Universities ›› 2009, Vol. 25 ›› Issue (6): 957-962.

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Aggregation Behavior and Structure of Associated Polyacrylamide Hydrophobically Modified with 2-Phenoxylethylacrylate

DAI Yu-hua^1*, WU Fei-peng², LI Miao-zhen² and WANG Er-jian²

1. Department of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, P. R. China;
2. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100101, P. R. China

Received:2008-10-16 Revised:2009-03-09 Online:2009-11-25 Published:2010-01-25
Contact: DAI Yu-hua. E-mail: daiyuhua@bipt.edu.cn
Supported by:
Supported by the Youth Research Fund of Beijing Institute of Petrochemical Technology(No.N07-04).

Abstract

Abstract:

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.

Key words: Aggregation behavior and structure; Hydrophobically modified; Copolymer P(AM/POEA)

DAI Yu-hua*, WU Fei-peng, LI Miao-zhen and WANG Er-jian. Aggregation Behavior and Structure of Associated Polyacrylamide Hydrophobically Modified with 2-Phenoxylethylacrylate[J]. Chemical Research in Chinese Universities, 2009, 25(6): 957-962.

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Aggregation Behavior and Structure of Associated Polyacrylamide Hydrophobically Modified with 2-Phenoxylethylacrylate

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