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Title: Thermal stabiligy of luminescent conducting polymers
Authors: Wang, HM
Tao, XM 
Newton, E
Keywords: Luminescent conducting polymer
Thermal stability
Lifetime prediction
Issue Date: 2002
Source: IFFTI International Conference 2002 : Fashion and Textiles : the New Frontiers : Design, Technology and Business : 7-9 November 2002, Hong Kong, p. 572-578 How to cite?
Abstract: The thermal stability of luminescent conducting polymers as PLED materials and intelligent optical fiber additives directly influences their service lifetime. The thermal stability and degradation kinetics of a luminescent conducting polymer, poly [2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), are investigated in this paper. The lifetime is predicted based on the thermal properties. The DTG curves indicate a double-stage decomposition process in the nitrogen atmosphere, and a multi-stage decomposition process in the air atmosphere. The apparent activation energy values of MEH-PPV are higher in the nitrogen than under air. Activation energies are slightly increasable and approximately stable in nitrogen for the initial mass loss, while the activation energy changes differently with the percentage of mass loss in air. The activation energy decreases for the initial mass loss and increases with mass loss when the mass loss is above 30 %, beyond 70 % it decreases again. The lifetime of MEH-PPV decreases dramatically from 106 min to 0.03 min as the temperature increases from 25 °C to 300 °C in air. The lifetime is longer in nitrogen than in air and decreases from 1014 min to 2.34 min with increasing the temperature from 25 °C to 300 °C in nitrogen. These lifetime parameters indicate that the service/process temperature has a strong influence on the luminescence of MEH-PPV. The maximum absorption and wavelength at maximum absorption of MEH-PPV decrease with increasing temperature in the visible region.
ISBN: 9623673515, 9789623673518
Appears in Collections:Conference Paper

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