Journal
EUROPEAN POLYMER JOURNAL
Volume 48, Issue 1, Pages 116-126Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2011.10.008
Keywords
NLO; Polyimide; SHG coefficient; Crosslinking; Relaxation of dipole alignment; Huisgen reaction
Categories
Funding
- Agence Nationale de la Recherche
- Region Aquitaine
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A new implementation of copper-free thermal Huisgen 1,3-dipolar crosslinking reaction into a high T-g hyperbranched polyimide polymer in order to stabilize the electro-optic (EO) activity of second-order non linear materials is reported. Towards this goal, two different synthetic approaches were explored. The first strategy is based on the post-functionalization of the polymer with mixtures of DR1 azido derivative and propargylic alcohol, whereas, the second consists in the preparation of two complementary functionalized hyperbranched polymers that are mixed just before the preparation of films. Materials exhibit good second-order nonlinear optical coefficients (d(33)) close to 30 pm/V at the fundamental wavelength of 1064 nm. Moreover, the thermal stability of the NLO properties of these materials reaches temperatures as high as 150 degrees C, and probably higher. This represents the highest thermal stability of crosslinkable EO polymers based on the crosslinking Huisgen reaction. (C) 2011 Elsevier Ltd. All rights reserved.
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