Thermodynamics, morphology, and structure of the poly(vinylidene fluoride)-ethyl acetoacetate system

Dasgupta, D. ; Malik, S. ; Thierry, A. ; Guenet, J. M. ; Nandi, A. K. (2006) Thermodynamics, morphology, and structure of the poly(vinylidene fluoride)-ethyl acetoacetate system Macromolecules, 39 (18). pp. 6110-6114. ISSN 0024-9297

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ma0610921

Related URL: http://dx.doi.org/10.1021/ma0610921

Abstract

The poly(vinylidene fluoride) (PVF2)-ethyl acetoacetate (EAA) system produces polymer-solvent compounds. The temperature-concentration phase diagram and the Tamman's diagram indicate that the polymer-solvent complexes are of two different types which are stable in different temperature regions; one is a congruently melting compound while the other is of the singular type. Also, a metatectic-like behavior is observed due to the peculiar melting behavior of PVF2. The morphology of the compounds resembles a "crumpled cloth" network, with the probable presence of chain-folded lamellae. SAXS study indicates presence of chain-folded lamellae of lamellar thickness 8 nm in the PVF2-EAA systems. FTIR and WAXS spectra indicate formation of a polymorphic structure of PVF2, and they are consistent with the occurrence of compounds. Indeed, two new X-ray diffraction peaks are observed for the system at 2θ = 22.2°and 24.0° near the polymer-solvent complex stoichiometric composition (WPVF2 = 0.33). The FTIR spectrum also shows a new peak at 592 cm-1 for the complex formation at the stoichiometric composition. Molecular modeling using the MMX program supports the polymer-solvent complexation in this system.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:24125
Deposited On:29 Nov 2010 10:23
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