Preparation of Photoresponsive Functionalized Acrylic Nanoparticles Containing Carbazole Groups for Smart Cellulosic Papers

Document Type : Research Paper

Authors

Polymer Science Department, Faculty of Science, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran

Abstract

Photoresponsive functionalized polymer nanoparticles were prepared as useful materials for preparation of smart papers. Such polymer nanoparticles have wide applications in several fields including papers, sensors, bioimaging and biomedicine. First, carbazole as a photosensitive compound was modified with 2-bromoethanol through substitution nucleation reaction to its hydroxyl derivative (N-(2-hydroxyethyl) carbazole, CzEtOH). The synthesis of 2-N-carbazolylethyl acrylate (CzEtA) monomer was carried out by modification reaction of CzEtOH with acryloyl chloride and the chemical structures of the products were characterized. Next, CzEtA, methyl methacrylate (MMA) and butyl acrylate were copolymerized to prepare photoresponsive functionalized polymer nanoparticles through mini-emulsion polymerization in order to form a hydrophobic core. This was followed by copolymerization of MMA and glycidyl methacrylate by seeded emulsion polymerization to give a functionalized outer layer on the latex particles. Absorption characteristics, size, size distribution (narrow size distribution) and morphology of the nanoparticles were studied by ultraviolet-visible (UV-Vis) spectroscopy, dynamic laser light scattering (DLS) analysis and scanning electron microscopy (SEM) micrographs, respectively. Finally, due to the importance of photoresponsive smart papers and their wide applications, cellulosic fibers were reacted with the prepared functionalized latex particles for preparation of smart papers. Morphology of the fibers was investigated with respect to the surface-immobilized polymers on the cellulosic paper and their smart behavior was evaluated by UV irradiation at 254 nm. The results revealed fast color changes and the obtained cellulosic papers became violet upon irradiation. This work shows some promising feature of these materials for preparation of anti-counterfeiting papers, where the safety becomes a major concern.

Keywords

References

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Iranian Journal of Polymer Science and Technology
Volume 30, Issue 5 - Serial Number 151
January and February 2018
Pages 435-446

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