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Spectral characterization and thermal behaviour of crosslinked poly(hydroxyethylmethacrylate) beads prepared by suspension polymerization
Author(s) -
Kiremitçi MenemşE,
Çukurova Hakan,
Özkar Saim
Publication year - 1993
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4990300313
Subject(s) - copolymer , polymer chemistry , monomer , thermal stability , suspension polymerization , materials science , fourier transform infrared spectroscopy , suspension (topology) , polymerization , magnesium , thermal decomposition , chemical engineering , stabilizer (aeronautics) , chemistry , polymer , organic chemistry , composite material , mathematics , homotopy , pure mathematics , engineering , mechanical engineering , metallurgy
Crosslinked poly(hydroxyethylmethacrylate) [poly(HEMA)] beads were prepared by the suspension copolymerization of 2‐hydroxyethylmethacrylate monomer with ethyleneglycol dimethacrylate (EGDMA) in aqueous media which contained only magnesium oxide (MgO) as a suspension stabilizer and also salting‐out agent. The procedure gives spherical particles with narrow size distribution. The reaction mechanism, composition and structure of poly(HEMA) beads were studied by solid‐state 13 C CP/MAS NMR, FTIR, ESCA, and elemental analysis. 13 C NMR implies the existence of unreacted pendant groups in the HEMA‐EGDMA copolymer. The surface composition obtained by ESCA is almost the same as the bulk composition determined by elemental analysis. FTIR spectra provide compelling evidence for the presence of carboxyl and hydroxyl groups. The glass‐transition temperature and the thermal stability of beads were determined by DSC.