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Thermal relaxation in poled non‐linear optical sidechain polymers: Influence of annealing
Author(s) -
van Der Vorst Cornelis P.J.M.,
van Gassel Rob A.P.
Publication year - 1997
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.19971130112
Subject(s) - annealing (glass) , poling , materials science , debye , polymer , thermal stability , relaxation (psychology) , analytical chemistry (journal) , composite material , chemistry , optoelectronics , organic chemistry , ferroelectricity , dielectric , psychology , social psychology
The influence of different annealing treatments has been investigated on the stability of the Electro‐Optic coefficient in a poled DANS (4‐dimethylamino‐4′‐nitrostilbene) sidechain polymer, which was poled near its T g ‐onset of 140°C. The annealing treatments and the EO relaxation experiments were performed at 120°C. The EO stability can be significantly increased both by an annealing treatment after poling and by annealing before poling. This latter effect is concluded from the reduction of the EO relaxation rates in successive relaxation cycles performed in the same polymer sample ‐ completely depoled and repoled in between the cycles. The effect from the different annealing treatments on the time‐dependence of the EO relaxation process is different and is analyzed in terms of a Debye‐like model with a single, time‐dependent Debye relaxation time r(t)=r i +C. t 3 . The time‐dependence of r and the observed effects from annealing are attributed to the parallel relaxation process of physical ageing.