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On the electrochemical polymerization of poly(p-phenylene vinylene) and poly(o-phenylene vinylene)

2001; Elsevier BV; Volume: 118; Issue: 1-3 Linguagem: Inglês

10.1016/s0379-6779(00)00282-4

1879-3290

Laura O. Péres, Hamilton Varela, Jarem Raul Garcia, Márcio Fernandes, Roberto M. Torresi, Francisco Carlos Nart, Jonas Gruber,

Advanced Sensor and Energy Harvesting Materials

This paper describes the electrochemical synthesis of poly(p-phenylene vinylene) and poly(o-phenylene vinylene), via potentiostatic cathodic reduction of α,α,α′,α′-tetrabromo-p-xylene and α,α,α′,α′-tetrabromo-o-xylene. The polymerization yield obtained from the electrochemical quartz crystal microbalance were 88 and 25% for poly(p-phenylene vinylene) and poly(o-phenylene vinylene), respectively. The films were characterized by infrared spectroscopy. The polymer has been identified by the vibrational features characteristic of the trans-vinylene units (3024 and 965 cm−1 for the p-PPV and 2991 and 1002 cm−1 for the o-PPV). A quinoid structure has been identified, indicating that the polymer is partially doped, probably the Br2, formed during the polymerization process. The insoluble phase was identified as p-PPV and o-PPV oligomers by the characteristic bands of the vinylene group. The p-PPV presents oligomers with molar mass corresponding to oligomers of seven monomeric units, while the o-PPV presents shorter chains, probably containing three to four units, as determined by gel permeation chromatography.