Abstract
A series of novel fluorinated crosslinkable poly(phthalazinone ether)s bearing tetrafluorostyrene groups (FSt-FPPEs) was prepared by polycondensation from 4-(4′-hydroxyphenyl)-phthalazin-1(2 H)-one (DHPZ), decafluorobiphenyl, 4,4-(hexafluoroisopropylidene)diphenol (6F-BPA) and pentafluorostyrene (FSt) for optical waveguide applications. The obtained polymers exhibited good solubility in common organic solvents and could be easily cast into optical-quality thin films. The resulting polymers could be thermally crosslinked either at 160 °C in the presence of a free radical initiator dicumyl peroxide under vacuum or at 280 °C in the absence of any initiator under vacuum. The polymers had high glass transition temperatures in the range 164–269 °C, which could be further increased by about 10 °C on thermal crosslinking. The crosslinked polymers had good thermal stabilities (the temperatures of 1% mass loss after curing ranged from 478 to 490 °C) and high glass transition temperatures. The crosslinked polymer films also exhibited good optical properties. By adjusting the feed ratio of the reactants, the refractive indices of transverse electronic and transverse magnetic modes (at 1550 nm) could be controlled well in the range of 1.4952–1.5625 and 1.4924–1.5538, respectively. The optical losses of the crosslinked polymers were rather low, <0.3 dB cm−1 at 1550 nm.
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This study was performed with support from the National Natural Science Foundation of China (Grant nos. 50143014, 60577014 and 60807015).
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Li, G., Wang, J., Guixian, S. et al. Synthesis and characterization of fluorinated crosslinkable poly(phthalazinone ether)s bearing tetrafluorostyrene groups for optical waveguides. Polym J 42, 880–886 (2010). https://doi.org/10.1038/pj.2010.85
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DOI: https://doi.org/10.1038/pj.2010.85
