Investigations on a Second Order Nonlinear Optical Interpenetrating PolymerNetwork. (Reannouncement with New Availability Information)

摘要

Polymeric materials with second order nonlinear optical (NLO) properties are ofmuch interest for applications such as waveguide electrooptic modulation and frequency doubling devices. The alignment of NLO chromophores in the poled polymers must be sufficiently stable at ambient temperature in order to use them in practical devices. 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. In this paper, we present a novel approach to achieve a much more stable second order NLO polymer by incorporating NLO moieties into an interpenetrating polymer network (IPN). An IPN is an intimate combination of two polymers both in network form. Permanent entanglement of the two polymer chains restrict their mobility which leads to a significantly more stable NLO material. Recently, we have developed an IPN system containing two crosslinked polymer which were developed in our laboratory. Characterizations and temporal stability of NLO properties for this IPN system are reported.... Nonlinear optical polymer, Interpenetrating polymer network.