Synthesis and characterization of main‐chain, second‐order, nonlinear optical polyurethanes with isolation moieties and zigzag structures

Abstract

In this study, two main-chain second-order nonlinear optical (NLO) polyurethanes were successfully prepared with indole-based chromophores. The introduced phenyl isolation group and the continuous zigzag polymer backbone were found to be helpful for effectively decreasing the intermolecular dipole-dipole interactions and enhancing the NLO properties of the resulting polymers. The studied polymers exhibited good optical transparency, high thermal stability, and excellent NLO effects; this indicated that the nonlinearity-stability trade-off and nonlinearity-transparency trade-off could be alleviated by this newly designed polymer system. Poly{4

Enhancement of nonlinear optical and thermal properties of polyurethanes by modifying the chromophores with fused heterocyclic and pyrimidine rings

“…Nonlinear optical (NLO) materials have gained a considerable attention during the last two decades in view of their tremendous potentiality in the field of telecommunication, optical data storage and optical information processing . Among the NLO materials studied, polymeric NLO materials are considered as the most feasible alternatives in photonics industries because of their exceptional properties, such as large optical nonlinearity, high‐molecular alignment, good processability, low optical loss, and ease of device fabrication .…”