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Thermal characteristics of poly(vinyl alcohol) and poly(vinylpyrrolidone) IPNs
Author(s) -
Jeong Kim Seon,
Jun Park Sang,
Young Kim In,
Hee Lee Yong,
Kim Sun I.
Publication year - 2002
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.11096
Subject(s) - thermogravimetric analysis , vinyl alcohol , differential scanning calorimetry , polymer chemistry , materials science , radical polymerization , glass transition , interpenetrating polymer network , polymer , polymerization , thermal decomposition , chemical engineering , chemistry , composite material , organic chemistry , physics , engineering , thermodynamics
Interpenetrating polymer network (IPN) hydrogels based on poly(vinyl alcohol) (PVA) and 1‐vinyl‐2‐pyrrolidone (VP) were prepared by radical polymerization using 2,2‐dimethyl‐2‐phenylacetophenone (DMPAP) and methylene bisacrylicamide (MBAAm) as initiator and crosslinker, respectively. The thermal characterization of the IPNs was investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dielectric analysis (DEA). Depressions of the melting temperatures of PVA segments in IPNs were observed with increasing VP content via the DSC. The DEA was employed to ascertain the glass transition temperature ( T g ) of IPNs. From the result of DEA, IPNs exhibited two T g s indicating the presence of phase separation in the IPN. The thermal decomposition of IPNs was investigated using TGA and appeared at near 270°C. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 1844–1847, 2002