Dielectric spectroscopy of some 'Biopol' polymers

摘要

In measurements of complex relative permittivity for PHB and PHBV over wide ranges of frequency and temperature, four distinct loss regions are apparent. These are attributed respectively to carbonyl-driven local mode β-relaxations involving cooperative motions of methyl and ester groups in amorphous domains, to the α-relaxation process associated with the glass transition in the amorphous regions, to an MWS polarization at the interface between crystalline and amorphous domains, and to the presence of phosphite residues.