Accession Number : ADA265798

Title :   An Interpenetrating Polymer Network as a Stable Second Order Nonlinear Optical Material: Comparison with the Guest/Host Systems.

Descriptive Note : Technical rept. 1 Jun 92-31 May 93,

Corporate Author : MASSACHUSETTS UNIV LOWELL DEPT OF CHEMISTRY

Personal Author(s) : Marturunkakul, S. ; Kumar, J. ; Tripathy, S. K.

Report Date : 31 MAY 1993

Pagination or Media Count : 7

Abstract : Polymeric materials with second order nonlinear optical (NLO) properties are of much interest for applications such as waveguide electrooptic modulation and frequency doubling devices. These NLO properties are presented when the chromophores are aligned in a noncentrosymmetric manner. The alignment of NLO chromophores in the poled polymers must be sufficiently stable at temperatures above 100 deg C in order to use them in practical devices. Several approaches have been adopted to enhance the temporal stability of the poled polymers. Enhanced temporal stability of second order NLO properties in several poled polymer systems has been achieved by crosslinking reactions. The resulting crosslinked network has a higher glass transition temperature and a denser matrix which prevent the aligned NLO chromophores from relaxing to a random orientation. However, slow decay of second order NLO properties at elevated temperatures was still observed in the polymers. Furthermore, the general form of the relaxation curves for the crosslinking polymers do not appear to be distinctly different from those for the guest/host systems. We have selected an interpenetrating polymer network (IPN) containing aligned NLO chromophores to test these issues. An IPN is a structure in which two or more networks are physically combined. The IPN is known to be able to remarkably suppress the creep and flow phenomena in polymers. Permanent entanglement of the two polymer chains restrict their mobility which leads to a significantly more stable NLO material. In this paper, we report on the design, synthesis and characterization of an NLO active IPN.... Interpenetrating polymer network, Nonlinear optical polymer.

Descriptors :   *NONLINEAR OPTICS, *OPTICAL MATERIALS, *NETWORKS, *POLYMERS, ALIGNMENT, CHAINS, CHROMOPHORES, CREEP, DECAY, ELECTROOPTICS, FLOW, FREQUENCY, GLASS, MOBILITY, CROSSLINKING(CHEMISTRY), PENETRATION, MODULATION, RELAXATION, STABILITY, STRUCTURES, SYNTHESIS, TEMPERATURE, TEST AND EVALUATION, TRANSITION TEMPERATURE, TRANSITIONS, WAVEGUIDES.

Subject Categories : Polymer Chemistry
      Optics
      Organic Chemistry
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE