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Functionalization of polypropylene film by radiation grafting of acryloyl chloride and subsequent esterification with Disperse Red 1
Author(s) -
Bucio Emilio,
Burillo Guillermina,
Del Pilar CarreónCastro María,
Ogawa Takeshi
Publication year - 2004
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.20446
Subject(s) - crystallinity , acryloyl chloride , grafting , materials science , polypropylene , differential scanning calorimetry , surface modification , scanning electron microscope , polymer chemistry , irradiation , chemical engineering , mesophase , optical microscope , composite material , polymer , copolymer , acrylate , liquid crystal , physics , optoelectronics , nuclear physics , engineering , thermodynamics
Polypropylene (PP) films were grafted with acryloyl chloride by γ‐irradiation, and the grafted films were reacted with an azo dye, Disperse Red 1. The films were characterized by X‐ray diffraction, scanning electron microscopy, atomic force microscopy, and differential scanning calorimetry. It was found that the grafting takes place first on the film surface, and with increase in the radiation dose the grafting penetrated inside of the film, decreasing the crystallinity of the PP film. The surface of the films was homogeneous, and a mesophase was observed for the film grafted with the dye through a polarized optical microscope. The dye underwent trans to cis photoreaction, whereby the red films became colorless by the irradiation of UV light at room temperature, although the color was recovered on standing, and more quickly when heated. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 172–178, 2004