PREPARATION AND THERMAL CHARACTERIZATION OF BLOCK-COPOLYMERS BY MACROAZONITRILES HAVING GLYCIDYL AZIDE AND EPICHLOROHYDRIN MOIETIES

Poly(glycidyl azide) (PGA) an energetic polymer and polyepichlorohydri n (PECH) were condensed with 4,4' azobis(4-cyanopentanoyl chloride) (A CPC) to prepare macro-azo-initiators. Block copolymers containing each of these polyethers as a block segment combined with polystyrene (PS) or poly(vinyl acetate) (PVAc) have been drived by the polymerization of monomers initiated with this macro-azo-initiators. Thermal properti es of block copolymers were investigated with differential scanning ca lorimetry (DSC) and thermogravimetry. DSC traces showed single glass t ransition temperatures in between the related segments of copolymers. Dynamic thermogravimetric analysis revealed the individual degradation behaviors of block segments (C) 1996 John Wiley & Sons, Inc.