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Crosslinked poly(norbornene-dicarboximide)s as electro-optic chromophore hosts.

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Title: Crosslinked poly(norbornene-dicarboximide)s as electro-optic chromophore hosts.
Authors: Spring, Andrew M.1, Qiu, Feng1, Hong, Jianxun1, Bannaron, Alisa2, Kashino, Tsubasa3, Kikuchi, Takamasa3, Ozawa, Masaaki3, Nawata, Hideyuki3, Odoi, Keisuke3, Yokoyama, Shiyoshi1 s_yokoyama@cm.kyushu-u.ac.jp
Source: European Polymer Journal. Dec2017, Vol. 97, p263-271. 9p.
Subjects: Dicarboximides, Chromophores, Electrooptics, Crosslinked polymers, Ring formation (Chemistry), Metathesis reactions
Abstract: A series of crosslinked poly(norbornene-dicarboximide)s have been prepared by ring opening metathesis polymerization. Increasing quantities of a bifunctional norbornene-dicarboximide crosslinker was doped into a high T g cyclohexyl-substituted norbornene-dicarboximide monomer before polymerization. The wt% of the crosslinker was increased from 0.00 to 4.40 wt%, after which the polymers became gelated. Polymer molecular weights increased drastically from 23,500 to 2,135,000 g/mol, the polydispersities increased from 1.18 to 73.47 and the viscosities increased from 5.27 to 538.7 mPa·s as the wt% of the crosslinker was increased. The trans : cis vinylene ratio remained constant at 1:0.18 as well as the T g and T d with average values of 210 °C and 392 °C being measured. Five of the crosslinked polymers and the reference homopolymer were utilized as hosts for the high activity tert -butyldiphenylsilyl substituted FTC chromophore guest. The polymer host containing 1.96 wt% crosslinker was found to have a maximum r 33 of 78 pm/V when polled at 150 °C with an electric field strength of 100 V/μm. The r 33 increased linearly from 63 to 78 pm/V as the wt% of the crosslinker was increased from 0.00 to 1.96 wt%. The thermal and temporal stability was found to increase slightly with the 0.00 wt% polymer exhibiting a stability of 77%, while the 1.96 wt% polymer exhibited a stability of 79% when both were heated to 85 °C and aged for 500 h in air. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:A series of crosslinked poly(norbornene-dicarboximide)s have been prepared by ring opening metathesis polymerization. Increasing quantities of a bifunctional norbornene-dicarboximide crosslinker was doped into a high T g cyclohexyl-substituted norbornene-dicarboximide monomer before polymerization. The wt% of the crosslinker was increased from 0.00 to 4.40 wt%, after which the polymers became gelated. Polymer molecular weights increased drastically from 23,500 to 2,135,000 g/mol, the polydispersities increased from 1.18 to 73.47 and the viscosities increased from 5.27 to 538.7 mPa·s as the wt% of the crosslinker was increased. The trans : cis vinylene ratio remained constant at 1:0.18 as well as the T g and T d with average values of 210 °C and 392 °C being measured. Five of the crosslinked polymers and the reference homopolymer were utilized as hosts for the high activity tert -butyldiphenylsilyl substituted FTC chromophore guest. The polymer host containing 1.96 wt% crosslinker was found to have a maximum r 33 of 78 pm/V when polled at 150 °C with an electric field strength of 100 V/μm. The r 33 increased linearly from 63 to 78 pm/V as the wt% of the crosslinker was increased from 0.00 to 1.96 wt%. The thermal and temporal stability was found to increase slightly with the 0.00 wt% polymer exhibiting a stability of 77%, while the 1.96 wt% polymer exhibited a stability of 79% when both were heated to 85 °C and aged for 500 h in air. [ABSTRACT FROM AUTHOR]
ISSN:00143057
DOI:10.1016/j.eurpolymj.2017.10.022