title: Increased thermal stability of a poled electro-optic polymer using high-molar-mass fractions.
abstract: Polymer fractionation yields materials with higher average molar masses and thus substantially increased glass transition temperatures. We apply this technique to a photoaddressable polymer that exhibits high electro-optic coefficients, in order to enhance the thermal stability of the poled material. The degree of orientation of the dipolar chromophores is investigated with both pyroelectric and electro-optic measurements. The pyroelectric measurements at elevated temperatures show no significant contribution of beta relaxation as compared to alpha relaxation.
authors.affiliation: Physikalisches Institut, Universität Bonn, Wegelerstrasse 8, 53115 Bonn, Germany. betram@physik.uni-bonn.de
authors.forename: Ralph P
authors.initials: RP
authors.lastname: Bertram
authors.forename: Nils
authors.initials: N
authors.lastname: Benter
authors.forename: Dirk
authors.initials: D
authors.lastname: Apitz
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Soergel
authors.forename: Karsten
authors.initials: K
authors.lastname: Buse
authors.forename: Rainer
authors.initials: R
authors.lastname: Hagen
authors.forename: Serguei G
authors.initials: SG
authors.lastname: Kostromine