Abstract
High molecular weight, linear aromatic poly(ether ketone ketone)s with different iso-/tere-isomer repeating unit ratio (1000, 5050, 0100) have been studied by 1H and 13C n.m.r. spectroscopy. The polymers were obtained in particle form by precipitation electrophilic Friedel-Crafts acylation condensation of iso- and terephthaloyl chlorides with diphenyl ether, 1,4- and 1,3-bis(4-phenoxybenzoyl)benzenes. Conventional 1H and 13C n.m.r. spectroscopy shows para-substitution in the diphenyl ether fragments of the main chain. Analysis of the expanded 1H n.m.r. spectra for the ring proton resonances reveals defect meta- and ortho-structures. The amount and isomer ratio of these defect structures depend on the polymer structure and preparation path. The low field of 1H n.m.r. spectra of polyketones based on ‘small monomers’ (diphenyl ether and iso- and terephthaloyl chlorides) were found to show additional minor signals corresponding to a different type of defect structure. A possible mechanism of formation of these defect structures is discussed. © 1997 Elsevier Science Ltd.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
