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International Journal of Polymer Science
Volume 2017, Article ID 8236870, 13 pages
Research Article

Rheological Properties in Aqueous Solution for Hydrophobically Modified Polyacrylamides Prepared in Inverse Emulsion Polymerization

1Facultad de Ciencias Básicas, Ingeniería y Tecnología, Universidad Autónoma de Tlaxcala, Calzada Apizaquito S/N, 90300 Apizaco, TLAX, Mexico
2Facultad de Ingeniería Química, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, Col. San Manuel Ciudad Universitaria, 72520 Puebla, PUE, Mexico
3Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna #140, 25253 Saltillo, COAH, Mexico

Correspondence should be addressed to Valeria J. Gonzalez-Coronel; xm.paub.oerroc@zelaznog.airelav

Received 6 October 2016; Revised 2 February 2017; Accepted 6 February 2017; Published 29 March 2017

Academic Editor: Atsushi Sudo

Copyright © 2017 Shirley Carro et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Inverse emulsion polymerization technique was employed to synthesize hydrophobically modified polyacrylamide polymers with hydrophobe contents near to feed composition. Three different structures were obtained: multisticker, telechelic, and combined. N-Dimethyl-acrylamide (DMAM), n-dodecylacrylamide (DAM), and n-hexadecylacrylamide (HDAM) were used as hydrophobic comonomers. The effect of the hydrophobe length of comonomer, the initial monomer, and surfactant concentrations on shear viscosity was studied. Results show that the molecular weight of copolymer increases with initial monomer concentration and by increasing emulsifier concentration it remained almost constant. Shear viscosity measurements results show that the length of the hydrophobic comonomer augments the hydrophobic interactions causing an increase in viscosity and that the polymer thickening ability is higher for combined polymers.