Miscibility of poly(vinylidene fluoride) and atactic poly(methyl methacrylate)

Abstract

Different results for the miscibility between poly(vinylidene fluoride) (PVDF) and atactic poly(methyl methacrylate) (at-PMMA) have been reported. In this study, the interaction between PVDF and at-PMMA was confirmed, although such a kind of force was weak. With increasing PVDF weight fraction, the blends exhibited more heterogeneous properties, and the films thus appeared more opaque. The difference spectra after subtraction of PVDF and poly(methyl methacrylate) (PMMA) showed that the interaction between the carbonyl groups of PMMA and the hydrogen atoms of PVDF increased as the stretch vibration of CAO bonds band shifted to a lower frequency with higher PVDF content. From the computer analysis, the sum spectra of the blends could not be obtained by simple addition of the separate spectra of the homopolymers. The contact angle measurement demonstrated that the hydrophobicity against water increased with PVDF content and that contact angles against water were larger than 90°when the PVDF content exceeded 30%, indicating good water repellency. The contact angles against n-hexane, however, could not be measured because of the complete wetting of the film by n-hexane. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: [1][2][3][4][5] 2004

Surface characteristics and blood compatibility of PVDF/PMMA membranes

“…Molecular level miscible PVDF/PMMA blends can be fabricated over the whole composition range above its melting point and below its low critical solution temperature. Increasing PMMA content improves the hydrophilicity and processability of PVDF [13][14][15][16]. Particularly, PVDF is a semi-crystalline polymer having at least three regular conformations, namely, a, b, and c phases [17].…”

Modelling and Simulation of the Coalescence of Two Different Polymer Grains

“…Then the blends have been characterized by physico-chemical, thermal and thermomechanical methods; their rheological characteristics have been studied at molten state. These tests showed clearly the miscibility of PMMA and PVDF [1].…”

“…Then the blends have been characterized by physico-chemical, thermal and thermomechanical methods; their rheological characteristics have been studied at molten state. These tests showed clearly the miscibility of PMMA and PVDF [1].The coalescence tests have been performed on the grains of the initial polymers using a polarized light optical microscope combined by a hot stage, video camera and video capture software. The curves of coalescence were plotted using an image software analyzer.…”

Partially fluorinated proton exchange membranes based on PVDF–SEBS blends compatibilized with methylmethacrylate block copolymers

“…PVDF exhibits diverse crystalline forms ␣, ␤, ␥ and ␦.Itis known that crystallization of PVDF from the melt takes place mainly in the ␣-phase, at temperatures between 110 and 150 • C. ␤-phase with a crystallization temperature around 70-80 • C, can be obtained from solution crystallization or from melt by addition of small concentrations of PMMA [20,21]. The small exotherm observed at 78 • C is therefore an independent indication that the PMMA block of the SBM block copolymer is interacting with the PVDF phase and explains the observed double crystallization exotherms.…”

“…It was shown that the incorporation of concentration as low as 1 wt.% decreases the segregation scale leading to higher mechanical properties; and improved electrochemical properties. The compatibilization effect was provided by the well-known miscibility of acrylic blocks into PVDF [19][20][21], and the low interfacial tension between the butylacrylate blocks and the ethylene-butylene block of the SEBS.…”