Electrical conductivities of photochemically prepared polyethylene glycol dimethacrylate, reacted with iodine and lithium perchlorate dopants and activation energy determination for polymer-dopant interaction

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Abstract

Conductive polymers were obtained by using a new polymerization method where UV-light was used as a photochemical initiator. To obtain high percent conversion optimum irradiation times were determined. Since it was observed in a previous work that conductivity of some polymeric materials can be improved by the addition of dopants (Ramelow et al., Mat Res Innovat 2001, 5, 40; Ma et al., Tr J Chem 1997, 21, 313), in this work, the effect of dopants on conductivity of the polyethylene glycol dimethacrylate (PEGDM) was studied by using lithium perchlorate (LiClO4) and iodine (I2). The most effective dopant concentration was determined by measuring the conductivities. The conductivity change at various temperatures was traced during the reaction of PEGDM with dopant Lithium perchlorate (LiClO4) and the activation energy of dopant-polymer interactions was calculated. A method was developed to follow the kinetics of polymerization reactions by tracing conductivity changes with time at different temperatures. The polymerization pathway of ethylene glycol dimethacrylate was given in a previous work, and the mechanism was studied by using NMR and relaxation time method (Ramelow et al., J Appl Polym Sci 2006, 100, 5087). In this work, the suggested pathway was confirmed by additional calculations. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

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