Crystallization and physical properties of polyvinyl acetate/polyvinylidene fluoride blends

Abstract

Structural and thermal characterizations and dc resistivity measurements were performed for polyvinyl acetate (PVAc)/polyvinylidene fluoride (PVDF) blends. The ferro- to para- electric transition temperature ( TFP) and the melting temperature of PVDF were detected by DTA. X-ray diffraction and infrared analysis evidenced the presence of α- and β-PVDF crystalline phases for the studied blends. IR spectra revealed some structural defects such as difluorinated alkenes and head-to-head segments. The optical absorption spectra suggested the presence of two optical gaps. The electrical resistivity results were discussed on the basis of the modified interpolaron hopping model. The calculated values of the charge carrier hopping distance were in the range of 5.5-7.5 nm. The present blends are suggested to be used as pressure and microwave sensors and to produce a surface acoustic wave diffraction grating of variable order for laser optical communications.

Polyvinylidene fluoride‐poly(vinyl acetate)‐natural graphite blend nanocomposites: Investigations of electroactive phase formation, electrical, thermal, and wetting properties

“…The crystal growth occurs in a spiral wave pattern with and without PVAc at higher isothermal crystallization temperatures. Tawansi et al 16 have reported beta phase generation when PVDF‐PVAc blends were prepared by solvent casting technique. The authors have reported the generation of the β phase but did not quantify the electroactive phase in the blend.…”

On programming of polyvinylidene fluoride–limestone composite for four-dimensional printing applications in heritage structures

“…In the past two decades, thermoplastic-based composites have been explored widely for conventional and non-conventional manufacturing practices by investigating mechanical, flexural and crystallisation of polylactic acid (PLA), polypropylene (PP), polyvinylidene fluoride (PVDF) and polyethylene terephthalate glycol (PETG)-based composite. 10–13 Figure 1(a) shows the web of science-based cluster of PVDF polymer and the experimental studies that reported on its various properties and applications (the keywords PVDF and three-dimensional (3D) printing were used for bibliographic analyses). It has been ascertained that the polymer composite having carbon tubes, epoxy, limestone (CaCO 3 ), silica fumes and functionally graded reinforcements imparts smart properties to the material and increases the mechanical strength of the base polymer matrix and thereby their industrial applications.…”