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Thermal properties and crystallization behavior of poly(ether ether ketone ketone)/poly(ether biphenyl ether ketone ketone) copolymers
Author(s) -
Shibata Mitsuhiro,
Yosomiya Ryutoku,
Jiang Zhenhua,
Fang Zhijie,
Wu Zhongwen
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021971009
Subject(s) - ketone , copolymer , ether , differential scanning calorimetry , polymer chemistry , crystallization , thermogravimetric analysis , materials science , glass transition , biphenyl , chemistry , organic chemistry , polymer , physics , thermodynamics
Thermal properties of poly(ether ether ketone ketone) (PEEKK)/poly(ether biphenyl ether ketone ketone) (PEDEKK) copolymers were investigated by means of differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The glass transition temperature ( T g ) increases from 154°C to 183°C as the content of PEDEKK units increases. The melting point ( T m ) of the copolymers varied in the range between 314°C and 409°C and showed the behavior of eutectic type copolymer. From the investigation of the crystallization behavior of the copolymers, it was found that the cold‐crystallization temperature ( T c ′ ) of the amorphous copolymers assumes a maximum value for the copolymer with a mole fraction of the PEDEKK segment ( n B ) of about 0.6, isothermally crystallized PEEKK and the PEEKK/PEDEKK copolymer exhibit double‐melting behavior.