Premium
Molecular order and dynamics in block copolymers of poly(oxybutylene) and poly(oxyethylene)
Author(s) -
Fragiadakis Daniel,
Bouga Maria,
Kyritsis Apostolos,
Pissis Polycarpos,
Viras Kyriakos,
Mingvanish Withawat,
Booth Colin
Publication year - 2003
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200390010
Subject(s) - copolymer , materials science , relaxation (psychology) , polymer chemistry , crystallinity , dielectric , molecular dynamics , dipole , polymer , chemical physics , polymer science , composite material , computational chemistry , chemistry , organic chemistry , psychology , social psychology , optoelectronics
Broadband dielectric spectroscopy (10 −2 ‐10 9 Hz) was employed to investigate the dynamics of poly(oxybutylene) chains in solid semicrystalline poly(oxybutylene)‐poly(oxyethylene)‐poly(oxybutylene) (BEB) triblock copolymers. The results are compared with those obtained for B homopolymers, EB diblocks and EBE triblocks. The B blocks were dipole‐inverted in the homopolymers and the EBE triblocks, however not in the EB and the BEB copolymers. The segmental α relaxation, caused by local chain motion, and the normal mode relaxation, due to chain motions of larger length scale, were studied in detail with respect to time scale, relaxation strength and shape of the response. The α relaxation in the BEB copolymers shows similar behavior to that in the other three systems, whereas the normal mode relaxation shows characteristic differences in the four systems.