Local vibration assisted molecular configurations in poly(vinylidene fluoride) of ordered ferroelectric phase in N,N-dimethylformamide

Amide-based polymer liquids are important for developing biological and optical colloids or nanofluids. Functionalized properties arise from specific molecular structures. In this investigation, we report model molecular configurations of a polymer liquid, 0.3 g/L poly(vinylidene fluoride) (PVF2) dissolved in liquid N,N-dimethylformamide (DMF), based on the characteristic IR vibration bands. Peculiarly, a ferroelectric beta-PVF2 phase reorders on a linear configuration in support with the DMF molecules, showing a characteristic band 840 cm(-1) (CH2 rocking and CF2 asymmetric stretching) with the trans band at 1275 cm(-1). Four C=O stretching bands nu(0)(1), nu(1)(1), nu(2)(1), and nu(3)(1) of 1650, 1675, 1725, and 1760 cm(-1) (bandwidth Delta nu(1/2) = 180 cm(-1) in the four bands) arise in four major configurations of DMF-PVF2 pairs (or derivatives). Only one prominent v? band 1660 cm(-1) (Delta nu(1/2) = 75 cm(-1)) incurs with a shoulder nu(1)(1) of 1725 cm(-1) (Delta nu(1/2) = 25 cm(-1)) in two DMF configurations. A ferroelectric field cased in presence of beta-PVF2 leads to enhance IR absorption by as much as an order of magnitude. It leads to converging non-bonding electron density on the amide moiety. (C) 2011 Elsevier B.V. All rights reserved.