4.6 Article

PP films grafted with N-isopropylacrylamide and N-(3-aminopropyl) methacrylamide by γ radiation: synthesis and characterization

Journal

RADIATION PHYSICS AND CHEMISTRY
Volume 79, Issue 5, Pages 615-621

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radphyschem.2009.12.007

Keywords

Graft copolymers; Polypropylene; N-isopropylacrylamide; N-(3-aminopropyl) methacrylamide; Stimuli-sensitive polymers

Funding

  1. DGAPA-UNAM [IN200208]
  2. MICINN [SAF2008-01679)]
  3. FEDER
  4. Xunta de Galicia [PGIDIT07CSA002203PR]

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Simultaneous grafting of N-isopropylacrylamide (NIPAAm) and N-(3-aminopropyl) methacrylamide hydrochloride (APMA) on polypropylene (PP) was investigated for obtaining interfaces that are stimuli-responsive under physiological conditions. A pre-irradiation method was optimized tuning the gamma-irradiation dose, reaction time, temperature, and monomers concentrations. FT-IR ATR and XPS analysis of the grafted copolymers evidenced a greater content in NIPAAm than in APMA; the APMA/NIPAAm ratio increasing with the concentration of APMA in the reaction medium and when the grafting was carried out in 1 M NaNO3. The grafted films were characterized regarding their thermal properties (DSC and TGA) swelling behavior and contact angle. Immersion of the pre-irradiated films in 1 M NIPAAm/0.5 M APMA aqueous solution rendered PP-g-(1NIPAAm-r-0.5APMA) which exhibited rapid and reversible transitions showing a LCST around the physiological temperature. By contrast, a greater content in APMA enhanced the hydrophilicity and prevented the shrinking of PP-g-(1NIPAAm-r-1APMA). (C) 2009 Elsevier Ltd. All rights reserved.

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