Temperature dependent impedance spectroscopy and Thermally Stimulated Depolarization Current (TSDC) analysis of disperse red 1-co-poly(methyl methacrylate) copolymers

Yee Song Ko; Eduardo Cuervo-Reyes; Frank A. Nüesch; Dorina M. Opris

doi:10.1117/12.2218803

5 May 2016 Temperature dependent impedance spectroscopy and Thermally Stimulated Depolarization Current (TSDC) analysis of disperse red 1-co-poly(methyl methacrylate) copolymers

Yee Song Ko, Eduardo Cuervo-Reyes, Frank A. Nüesch, Dorina M. Opris

Author Affiliations +

Proceedings Volume 9798, Electroactive Polymer Actuators and Devices (EAPAD) 2016; 97981I (2016) https://doi.org/10.1117/12.2218803
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2016, Las Vegas, Nevada, United States

Abstract

The dielectric relaxation processes of polymethyl methacrylates that have been functionalized with Disperse Red 1 (DR1) in the side chain (DR1-co-MMA) were studied with temperature dependent impedance spectroscopy and thermally stimulated depolarization current (TSDC) techniques. Copolymers with dipole contents which varied between 10 mol% and 70 mol% were prepared. All samples showed dipole relaxations above the structural-glass transition temperature (T_g). The β-relaxation of the methyl methacrylate (MMA) repeating unit was most visible in DR1(10%)-co-MMA and rapidly vanishes with higher dipole contents. DSC data reveal an increase of the T_g by 20 °C to 125°C with the inclusion of the dipole into the polymethyl methacrylate (PMMA) as side chain. The impedance data of samples with several DR1 concentrations, taken at several temperatures above T_g, have been fitted with the Havriliak-Negami (HN) function. In all cases, the fits reveal a dielectric response that corresponds to power-law dipolar relaxations. TSDC measurements show that the copolymer can be poled, and that the induced polarization can be frozen by lowering the temperature well below the glass transition. Relaxation strengths ΔƐ estimated by integrating the depolarization current are similar to those obtained from the impedance data, confirming the efficient freezing of the dipoles in the structural glass state.

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Yee Song Ko, Eduardo Cuervo-Reyes, Frank A. Nüesch, and Dorina M. Opris "Temperature dependent impedance spectroscopy and Thermally Stimulated Depolarization Current (TSDC) analysis of disperse red 1-co-poly(methyl methacrylate) copolymers", Proc. SPIE 9798, Electroactive Polymer Actuators and Devices (EAPAD) 2016, 97981I (5 May 2016); https://doi.org/10.1117/12.2218803

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KEYWORDS

Dielectric polarization

Dielectric spectroscopy

Temperature metrology

Glasses

Polymers

Polymethylmethacrylate

Electro optics

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