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Electrical determination of the degree of cross-linking in a poled non-linear optical polymer



Chemical Physics Letters 262 (1996), No.5, pp.663-7
ISSN: 0009-2614
Journal Article
Fraunhofer HHI ()
dielectric relaxation; nonlinear optics; optical polymers; thermally stimulated currents; cross-linking degree; poled nonlinear optical polymer; thermal dipole-orientation stability; isothermal measurements; thermally stimulated measurements; dipole relaxation

A comparative investigation of the thermal dipole-orientation stability in a guest-host and a cross-linked non-linear optical polymer with similar structures of the polymer backbone is reported. Cross-linking yields a rigid polymer network with two types of dipoles: those already cross-linked and therefore thermally stable and those not as yet cross-linked and therefore fast relaxing. The combination of isothermal and thermally stimulated measurements allows for a complete characterization of dipole relaxation in the two sample polymers.