SYNTHESIS AND COPOLYMERIZATION OF AZIDOMETHYL-SUBSTITUTED OXETANES: THE MORPHOLOGY OF STATISTICAL BLOCK COPOLYMERS
DOI:
https://doi.org/10.1007/3790Keywords:
3-azidomethyl-3-methyloxetane, 3, 3-bis(azidomethyl)oxetane, trialkylaluminum, amorphous-crystalline structure, domain structure, cationic ring-opening polymerizationAbstract
3,3-Bis(azidomethyl)oxetane and 3-azidomethyl-3-methyloxetane were obtained by bromination of pentaerythritol and metriol with a mixture of hydrobromic, acetic, and sulfuric acids, followed by cyclization in the presence of a phase-transfer catalyst TBAB, with the formation of oxetane ring and replacement of bromide substituents with azide ions. The copolymerization reaction of 3,3-bis-(azidomethyl)oxetane and 3azidomethyl-3-methyloxetane was performed in the presence of a catalytic system prepared from triisobutylaluminum and water. The methods of small-angle and wide-angle X-ray diffraction analysis were used to determine the amorphous-crystalline and domain structures of the synthesized copolymers. We also present data about conformational and relaxation transitions in these statistical copolymers.
