Electro-optic properties of a side chain poly(norbornene-dicarboximide) system with an appended phenyl vinylene thiophene chromophore

POLYMER

卷:119

Article

Spring, Andrew M.¹  Qiu, Feng¹  Hong, Jianxun¹  Bannaron, Alisa²  Yokoyama, Shiyoshi¹ 

[1] Kyushu Univ, Inst Mat Chem & Engn, 6-1 Kasuga Koen, Kasuga, Fukuoka 8158580, Japan

[2] Kyushu Univ, Dept Mol & Mat Sci, 6-1 Kasuga Koen, Kasuga, Fukuoka 8168580, Japan

关键词: Nonlinear optics (NLO);    Ring opening metathesis polymerization (ROMP);    FTC chromophores;    Random copolymers;    Side chain;    Poly(NDI)s;    Grubbs 3;    High glass transition temperature;    High thermal decomposition temperature;    High thermal stability;    High temporal stability;    High polling efficiency;   

DOI  :  10.1016/j.polymer.2017.05.005

来源: Elsevier

【 摘 要 】

A side chain EO copolymer series has been synthesized by ROMP using the Grubbs 3rd generation initiator and quenched with ethyl vinyl ether. The copolymers were prepared by combining two norbornene-dicarboximide monomers, one with a cyclohexyl substituent and another substituted with an FTC chromophore. The mol% of the chromophore-substituted monomer was varied from 0.00 mol% to 22.92 mol%, all polymers were obtained in a yield of between 83 and 92% and a purity of between 97 and 98%. The cis:trans vinylene ratio remained constant at 1:1, confirming the polymers were amorphous. Peak molecular weights increased from 29,541 g/mol to 142,113 g/mol and the PDI increased from 1.36 to 4.01 respectively. Glass transition and thermal decomposition temperatures decreased from 206 degrees C to 168 degrees C and 433 degrees C to 382 degrees C as the mol% of the chromophore-substituted monomer was increased. UV- vis absorbance spectroscopy was used to quantify the chromophore content. A close correlation (68-95%) between the measured and calculated absorbance was found. The polymer containing 22.92 mol% of the chromophore-substituted monomer had a maximum r(33) of 70 pm/V when polled at an optimum field of 60 V/mu m at a polling temperature of 200 degrees C. This equates to a high polling efficiency of 1.16. High current flow in this polymer film at elevated field strength caused a breakdown of the electrode, preventing access to an elevated electro-optic coefficient. This polymer was found to have an excellent stability of 76% when aged at 85 degrees C for 1000 h in air. (c) 2017 Elsevier Ltd. All rights reserved.

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