Premium
Miscibility and phase behavior in blends containing random copolymers of poly(ether ether ketone) and phenolphthalein poly(ether ether ketone)
Author(s) -
Guo Qipeng,
Huang Jinyu,
Chen Tianlu
Publication year - 1996
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/(sici)1097-4628(19960509)60:6<807::aid-app3>3.0.co;2-n
Subject(s) - ether , copolymer , miscibility , polymer chemistry , ketone , diphenyl ether , phenolphthalein , chemistry , materials science , organic chemistry , polymer
The miscibility and phase behavior of polysulfone (PSF) and poly(hydroxyether of bisphenol A) (phenoxy) with a series of copoly (ether ether ketone) (COPEEK), a random copolymer of poly(ether ether ketone) (PEEK), and phenolphthalein poly(ether ether ketone) (PEK‐C) was studied using differential scanning calorimetry. A COPEEK copolymer containing 6 mol % ether ether ketone (EEK) repeat units is miscible with PSF, whereas copolymers containing 12mol % EEK and more are not. COPEEK copolymers containing 6 and 12 mol % EEK are completely miscible with phenoxy, but those containing 24 mol % EEK is partially miscible with phenoxy. Moreover, a copolymer containing 17 mol % EEK is partially miscible with phenoxy; the blends show two transitions in the midcomposition region and single transitions at either extreme. Two T g s were observed for the 50/50 blend of phenoxy with the coplymer containing 17 mol % EEK, whereas a single composition‐dependent T g appeared for all the other compositions. An FTIR study revealed that there exist hydrogen‐bonding interactions between phenoxy and the copolymers. The strengths of the hydrogen‐bonding interactions in the blends of the COPEEK copolymers containing 6 and 12 mol % EEK are the same as that in the phenoxy/PEK‐C blend. However, for the blends of copolymers containing 17, 24, and 28 mol % EEK, the hydrogen‐bonding interactions become increasingly unfavorable and the self‐association of the hydroxyl groups of phenoxy is preferable as the content of EEK units in the copolymer increases. The observed miscibility was interpreted qualitatively in terms of the mean‐field approach. © 1996 John Wiley & Sons, Inc.