Highly Stable Optically Induced Birefringence and Holographic Surface Gratings on a New Azocarbazole-Based Polyimide
Citations Over TimeTop 10% of 1999 papers
Abstract
An azocarbazole-based polyimide was synthesized from an azocarbazole diamine monomer and 4,4‘-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) by a two-step polycondensation reaction. Birefringence experiments have been performed on the pure polyimide and on the polyimide mixed with small azo chromophores. Because of its high Tg, the polyimide has a very stable induced birefringence (only 14% loss during the relaxation process). The stability of the mixtures is also very high. Surface relief diffraction gratings were inscribed on these systems. The measured diffraction efficiency was about 0.25% for a diamine-doped polyimide exposed for 1 h to an irradiance of 200 mW/cm2. The surface profile studied by atomic force microscopy showed an amplitude of 30 nm and a regular spacing of 700 nm on a 255 nm thick film. The photoinduced gratings had a high stability without further surface deformation after baking at 240 °C for 1 h in air.
Related Papers
- → Preparation and Characterization of Highly Cross-Linked Polyimide Aerogels Based on Polyimide Containing Trimethoxysilane Side Groups(2014)69 cited
- → The preparation and properties of polyimide films modified by octa(aminopropylsilsesquioxane)(2019)13 cited
- → Interaction of N‐methylformanilide with high‐performance polyimide fibre and its effect on dyeing(2022)7 cited
- → Electrical conduction of polyimide films prepared from polyamic acid (PAA) and pre-imidized polyimide (PI) solution(2008)8 cited
- XPS를 이용한 Cu / Polyimide 계면에 관한 연구 : 상온에서 증착한 Cu의 초기성장과정(I)(1997)