Non-thermal plasma polymerization of HFC-134a in a dielectric barrier discharge reactor; Polymer characterization and understanding the mechanism of polymer formation (original) (raw)

IEEE Pulsed Power & Plasma Science Conference – PPPS 2013, 2013

Abstract

The plasma polymerization of HFC-134a (CF3CH2F) has been investigated in a non-thermal plasma dielectric barrier discharge reactor. HFC-134a is a green house gas and it has a global warming potential of 1410 with respect to CO2 and 100-year time horizon. Its release is regulated in many countries and its manufacture is likely to be controlled in the near future. A dielectric barrier discharge reactor, constructed from concentric alumina tubes was used for the investigation. The polymer generated from reaction was soluble in tetrahydrofuran solvent which suggests that it is non-crosslinked. The polymer was characterized using various NMR spectroscopic techniques (e.g., 13C, 19F) which reveal that the functional groups in the polymer include CHF, CF2 and CF3 groups. Based on these data, a detailed reaction mechanism has been developed which is similar but not identical to those available in the open literature. We previously reported the conversion of HFC-143a, the characterization of plasma discharge and the molecular weight of the polymers. This work is focused on a detailed structural analysis of the polymers and a proposed mechanism for their formation.

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