Graft-Copolymerization of Acrylate Monomers onto Chitosan Induced by Gamma Radiation: Amphiphilic Polymers and Their Behavior at The Air-Water Interface

M.  Caldera-Villalobos; B.  Leal-Acevedo; V. M.  Velazquez-Aguilar; M. D. P.  Carreon-Castro

doi:10.15415/jnp.2020.72027

Authors

M. Caldera-Villalobos Department of Radiation Chemistry and Radiochemistry, Institute of Nuclear Sciences, National Autonomous University of Mexico. Circuito Exterior, Ciudad Universitaria, 04510, Ciudad de México, México
B. Leal-Acevedo Radiation Safety and Radiation Unit, Institute of Nuclear Sciences, National Autonomous University of Mexico. Circuito Exterior, Ciudad Universitaria, 04510, Ciudad de México, México
V. M. Velazquez-Aguilar Faculty of Sciences, National Autonomous University of Mexico.. Ciudad Universitaria, 04510, Ciudad de México, México
M. D. P. Carreon-Castro Department of Radiation Chemistry and Radiochemistry, Institute of Nuclear Sciences, National Autonomous University of Mexico. Circuito Exterior, Ciudad Universitaria, 04510, Ciudad de México, México

DOI:

https://doi.org/10.15415/jnp.2020.72027

Keywords:

Ionizing radiation, Graft copolymer, Biobased polymers, Polymer coatings, LB films

Abstract

Graft polymerization induced by ionizing radiation is a powerful tool in materials science to modifying the physical properties of polymers. Chitosan is a biocompatible, biodegradable, antibacterial, and highly hydrophilic polysaccharide. In this work, we report the obtaining of amphiphilic polymers through graft polymerization of acrylic monomers (methyl acrylate, t-butyl acrylate, and hexyl acrylate) onto chitosan. The polymerization reaction was carried out by simultaneous irradiation of monomers and chitosan using a gamma radiation source of⁶⁰Co. The formation of Langmuir films of amphiphilic polymers was studied at the air-water interface through surface pressure versus main molecular area isotherms (Π-A) and hysteresis cycles of compression and decompression. Finally, it was analyzed the transferring of Langmuir films towards solid substrates to obtaining Langmuir-Blodgett films with potential application as an antibacterial coating. The microstructure of the Langmuir-Blodgett films was characterized by AFM microscopy observing a regular topography with roughness ranging between 0.53 and 0.6 μm.

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