Mechanical Relaxations and Transitions in Poly(Vinylidene Fluoride) PVDF

2006 ◽  
Vol 115 ◽  
pp. 151-156 ◽  
Author(s):  
A. Gasmi ◽  
M. Gouasmia ◽  
S. Etienne
Keyword(s):  
Differential Scanning Calorimetry ◽  
Room Temperature ◽  
Vinylidene Fluoride ◽  
Low Frequency ◽  
Mechanical Spectroscopy ◽  
Scanning Calorimetry ◽  
Dynamic Mechanical Spectroscopy ◽  
Poly Vinylidene Fluoride ◽  
Reversible Melting

Dynamic mechanical spectroscopy and differential scanning calorimetry measurements carried out on PVDF films are reported. Several mechanical relaxations are observed around - 100° C, -40° C, and 17° C at 1 Hz, respectively. It is shown that thermomechanical treatments induce variation of material morphology as revealed by calorimetry and low-frequency mechanical spectroscopy. The effect of long-term ageing at room temperature is attributed to reversible melting and formation of small crystallites. The molecular rearrangements involved in ageing at room temperature are characterized by a slow dynamics.

Preparation of Poly(Vinylidene Fluoride)/Silica Composite Nanofiber by Electrospinning Technique

2015 ◽  
Vol 804 ◽  
pp. 84-87 ◽  
Author(s):  
Moragote Buddhakala ◽  
Anchan Muakngam
Keyword(s):  
Differential Scanning Calorimetry ◽  
Electron Microscope ◽  
Mixed Solvent ◽  
Vinylidene Fluoride ◽  
Composite Membranes ◽  
Scanning Calorimetry ◽  
Electrospinning Technique ◽  
Composite Nanofiber ◽  
Poly Vinylidene Fluoride ◽  
Scanning Electron

A composite nanofiber containing poly (vinylidene fluoride) (PVDF) and silica (SiO2) were prepared by electrospinning of their mixtrues.The various amount of SiO2 nanoparticle was add with 15 wt.% PVDF solution in mixed solvent of N,N-dimethylacetamine (DMAc) : acetone at a ratio of 4:6 with the applied voltage of 8 kV, tip to collector distance of 10 cm and flow rate of 1 ml/hr. The morphology of the PVDF/SiO2 membranes was investigated by scanning electron microscope (SEM). The effect of SiO2 concentration on the morphology of the composite membranes were discussed. Crystallinity of the composite membranes was investigated by differential scanning calorimetry (DSC). It was found that SiO2 concentration have significant influence on the morphology and crystallinity of PVDF/SiO2 membranes.

scholarly journals Poly(vinylidene fluoride-trifluoroethylene) (72/28) interconnected porous membranes obtained by crystallization from solution

2011 ◽  
Vol 1312 ◽  
Author(s):  
Armando Ferreira ◽  
Jaime Silva ◽  
Vitor Sencadas ◽  
José Luís Gómez-Ribelles ◽  
Senentxu Lanceros-Méndez
Keyword(s):  
Room Temperature ◽  
Vinylidene Fluoride ◽  
Polymer Concentration ◽  
Porous Membranes ◽  
Membrane Thickness ◽  
Solvent Ratio ◽  
Scanning Calorimetry ◽  
Poly Vinylidene Fluoride ◽  
Crystallization From Solution ◽  
Polymer Solvent

ABSTRACTElectroactive macroporous poly[(vinylidene fluoride)-co-trifluoroethylene] membranes have been processed by solvent evaporation at room temperature with different polymer/solvent concentrations. The pore architecture consists on interconnected spherical pores and this morphology is independent of the membrane thickness. The porosity of the produced membranes increases from 72% for the higher polymer concentration in the polymer/solvent solution (15/85), up to 80% for the lowest polymer concentration in the polymer/solvent solution.Fourier transform infrared spectroscopy and differential scanning calorimetry measurements reveal that the polymer crystallizes in the ferroelectric phase and the polymer/solvent ratio does not influences the Curie transition and the melting temperature of the polymer.

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