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Development and evaluation of pH-dependent interpenetrating network of acrylic acid/polyvinyl alcohol

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Abstract

The objective of the present work was to synthesize interpenetrating networks (IPNs) of acrylic acid/polyvinyl alcohol (AA/PVA) by free radical polymerization using N,N-methylenebisacrylamide (MBAAm) and glutaraldehyde as cross-linkers. The IPNs were evaluated for swelling, diffusion coefficient and network parameters by using Flory–Huggins theory, i.e., the average molecular weight between cross-links (M c), polymer volume fraction in swollen state (V 2,s), number of repeating units between cross-links (M r) and cross-linking density (N). It was found that the degree of swelling of AA/PVA interpenetrating network increases greatly within the pH range 5–7 depending on composition. The gel fraction and porosity increased by increasing the concentration of AA or PVA, while by increasing the degree of cross-linking, porosity decreased and gel fraction increased. Selected samples were loaded with chlorpheniramine maleate as a model drug. Drug release was studied in USP, hydrochloric acid buffer solution of pH 1.2 and phosphate buffer solutions of pH 5.5 and 7.5. Drug release data were fitted into various kinetics models, e.g., zero-order, first-order, Higuchi and Peppas models. The results of the kinetics investigation showed that the drug release from IPNs followed non-Fickian diffusion. Fourier transform infrared spectra confirmed the formation of cross-linked IPNs as there was a shifting to lower frequency of 1,713–1,718 cm−1 with reduced intensity, while scanning electron microscopy revealed uniform distribution of drug in IPNs.

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Faculty of Pharmacy, Bahauddin Zakariya University, P.O. Box: 60800, Multan, Pakistan

    Shahid Shah & Nazar Mohammad Ranjha

  2. Akson College of Health sciences, Mirpur University of Science & Technology (MUST), Mirpur, Azad kashmir, Pakistan

    Zeeshan Javaid

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  1. Shahid Shah
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  2. Nazar Mohammad Ranjha
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  3. Zeeshan Javaid
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Correspondence to Zeeshan Javaid.

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Shah, S., Ranjha, N.M. & Javaid, Z. Development and evaluation of pH-dependent interpenetrating network of acrylic acid/polyvinyl alcohol. Iran Polym J 22, 811–820 (2013). https://doi.org/10.1007/s13726-013-0180-0

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  • DOI: https://doi.org/10.1007/s13726-013-0180-0

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