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Preparation of phosphor coated with a polymer by emulsion polymerization and its application in low‐density polyethylene
Author(s) -
Chen Tonghua,
Luo Yongyue,
Zou Jiangpeng,
Jiang Long,
Dan Yi,
Zhang Li,
Zhao Kun
Publication year - 2008
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.28381
Subject(s) - phosphor , materials science , low density polyethylene , polymer , composite material , emulsion polymerization , chemical engineering , phosphorescence , polyethylene , scanning electron microscope , polymerization , polymer chemistry , physics , optoelectronics , quantum mechanics , fluorescence , engineering
The long‐afterglow phosphor SrAl 2 O 4 : Eu 2+ , Dy 3+ is liable to hydrolyze in water with deterioration of its luminescent properties. In this study, i n situ emulsion polymerization was first used to prepare phosphor coated with poly(methyl methacrylate‐ co ‐butyl acrylate) [P(MMA‐ co ‐BA)] to improve water resistance. Fourier transform infrared spectra suggested that the polymer attached to the phosphor by chemical bonding. Observation by scanning electron microscopy (SEM) showed that a polymer layer formed on the surface of the phosphor. The resistance to water of the phosphor coated with the polymer layer was much better than that of the uncoated phosphor because the transparent polymer layer could suppress its hydrolysis process. Low‐density polyethylene (LDPE) plastics, doped with long‐afterglow phosphors, were manufactured with an extrusion technique. Through coating with P(MMA‐ co ‐BA), the compatibility of phosphor with the LDPE matrix was improved, as determined by SEM. The luminous LDPE plastics blended with the phosphor coated with polymer showed long and strong phosphorescence with little loss of persistence phosphorescence compared to the uncoated phosphor. The LDPE plastics still retained their mechanical properties through doping with 3% (mass fraction) of the phosphors. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008