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Preparation and self-assembly properties of silicone-modified hydrophobically associating polyacrylamide

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Abstract

Silicone-modified hydrophobically associating polyacrylamide (USPAM) was prepared by emulsifier-free ultrasonically assisted radical polymerization with acrylamide (AM), dimethylvinylphenylsilane (DMPS), and 2-acrylamido-2-methylpropane sulfonic acid (AMPS). Various aspects of the copolymerization reaction and the effects of salt, temperature, and surfactant (sodium dodecyl sulfate, SDS) on the self-assembly behavior of USPAM were studied through viscometry, fluorescence spectroscopy (FS), laser light scattering (LLS), rheology and other methods. The results showed that the optimal polymerization conditions were: contents of DMPS, AMPS, and initiator were 0.80 mol%, 10 mol%, and 0.40 wt%, respectively; the pH was 8.0; and an ultrasonic power was 140 W. As the concentration of USPAM increased, the hydrophobic self-assembly behavior of USPAM caused its apparent viscosity and the amount of crosslinking in its structure to increase. The critical association concentration (CAC) was observed to be near to 0.38 g dl−1. Salt resistance appeared when the concentration of the USPAM solution exceeded 0.20 g dl−1. A maximum value of the apparent viscosity of USPAM solution was seen as the temperature was increased due to the enhanced self-assembly properties of the molecules. The addition of SDS improved the self-assembly behavior of USPAM below the CAC, but degraded this behavior above the CAC. The shape factor (<R g>/<R h>) tended to continuously increase. The aggregation number (N) presented a minimum value in the USPAM-SDS system.

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Acknowledgments

We would like to express our great thanks to the Natural Science Foundation of China (50973057) and the Natural Science Foundation of Shaanxi Province (2012JQ2004, 2012JQ2005) as well as the Major Scientific and Technological Innovation Foundation of Shaanxi Province (2011ZKC04-3) and the Shaanxi Provincial Department of Science and Technology Plan Projects (2011JK0609) for financial support.

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Correspondence to Chen Wang.

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Wang, C., Li, X., Li, P. et al. Preparation and self-assembly properties of silicone-modified hydrophobically associating polyacrylamide. J Polym Res 20, 147 (2013). https://doi.org/10.1007/s10965-013-0147-z

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