Influence of the solvent evaporation rate on the crystalline phases of solution-cast poly(vinylidene fluoride) films

2009 ◽  
pp. n/a-n/a ◽  
Author(s):  
Dante Luis Chinaglia ◽  
Rinaldo Gregorio ◽  
Josiani Cristina Stefanello ◽  
Ruy Alberto Pisani Altafim ◽  
Werner Wirges ◽  
...  
Keyword(s):  
Evaporation Rate ◽  
Vinylidene Fluoride ◽  
Solvent Evaporation ◽  
Crystalline Phases ◽  
Poly Vinylidene Fluoride ◽  
Solution Cast

scholarly journals Evaporation-Induced Crystal Nucleation and Morphology of Dried Poly(Vinylidene Fluoride) Droplets

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1442
Author(s):  
Yongri Liang ◽  
Susu Wang
Keyword(s):  
Droplet Size ◽  
Evaporation Rate ◽  
Vinylidene Fluoride ◽  
Grazing Incidence ◽  
Solvent Evaporation ◽  
Crystal Nucleation ◽  
Coffee Ring ◽  
Poly Vinylidene Fluoride ◽  
Coffee Ring Effect ◽  
Ring Effect

The evaporation of a polymer solution droplet is important in solution-based polymer film fabrications, such as inkjet printing, spray coatings, and droplet casting, etc. In this work, we investigated the effect of droplet size, solvent evaporation rate, and concentration on the “coffee-ring” effect, crystal nucleation, polymorphism, and morphology of dried poly (vinylidene fluoride) (PVDF) solution droplets with the atomic force microscopy (AFM) and two-dimensional grazing incidence wide angle X-ray scattering (2D GIWAXS) method. We found that the crystal structure, morphology and crystal distribution in the center and edge regions of dried PVDF droplets were different due to the “coffee-ring” effect. The “coffee-ring” effect of dried PVDF droplets was mainly composited of accumulated crystals at the edge region of a droplet, which was mainly made by the crystallization of migrated chains. The interplay between the migration of chains and the crystallization and solidification of PVDF droplets significantly influenced the formation of the “coffee-ring”. In addition, our results showed that the decrease in droplet size and the controlling solvent evaporation rate were effective ways to improve the electroactive crystalline phases (β and γ-phases) nucleation and decrease the crystal size.

scholarly journals Tailoring porous structure of ferroelectric poly(vinylidene fluoride-trifluoroethylene) by controlling solvent/polymer ratio and solvent evaporation rate

2011 ◽  
Vol 47 (12) ◽  
pp. 2442-2450 ◽  
Author(s):  
António California ◽  
Vanessa F. Cardoso ◽  
Carlos M. Costa ◽  
Vitor Sencadas ◽  
Gabriela Botelho ◽  
...  
Keyword(s):  
Porous Structure ◽  
Evaporation Rate ◽  
Vinylidene Fluoride ◽  
Solvent Evaporation ◽  
Poly Vinylidene Fluoride ◽  
Polymer Ratio

scholarly journals Evaporation Induced Crystal Nucleation and Morphology of Dried Poly (Vinylidene Fluoride) Droplets

2021 ◽  
Author(s):  
Yongri Liang ◽  
Susu Wang
Keyword(s):  
Droplet Size ◽  
Evaporation Rate ◽  
Vinylidene Fluoride ◽  
Beta Phase ◽  
Solvent Evaporation ◽  
Crystal Nucleation ◽  
Force Microscopy ◽  
Spray Coatings ◽  
Coffee Ring ◽  
Poly Vinylidene Fluoride

The evaporation of polymer solution droplet is an important in solution-based polymer film fabrications, such as inkjet print, spray coatings, and droplet casting etc. In this work, we investigated the effect of droplet size, solvent evaporation rate, and concentration on “coffee-ring” effect, crystal nucleation, polymorphism, and morphology of dried poly (vinylidene fluoride) (PVDF) solution droplets with atomic force microscopy (AFM) method. We found that the crystal structure, morphology and crystal distribution in the center and edge regions of dried PVDF droplets were different due to “coffee-ring” effect. The “coffee-ring” effect of dried PVDF droplets was mainly composited of accumulated crystals at the edge region of droplet, which was mainly made by crystallization of migrated chains. The interplay between migration of chains, crystallization and solidification of PVDF droplets significantly influenced the formation of “coffee-ring”. In addition, our results showed that the decrease of droplet size and controlling solvent evaporation rate were effective ways to improve the PVDF β-phase nucleation and decrease crystal size.

The impact of solvents on properties of solution-cast poly(vinylidene fluoride) films for energy storage

2018 ◽  
Vol 219 ◽  
pp. 201-204 ◽  
Author(s):  
Yuetao Zhao ◽  
Yujiu Zhou ◽  
Yajie Yang ◽  
Jianhua Xu ◽  
Zhi David Chen ◽  
...  
Keyword(s):  
Energy Storage ◽  
Vinylidene Fluoride ◽  
Poly Vinylidene Fluoride ◽  
Solution Cast ◽  
The Impact

Influence of Evaporation Temperature on the Morphology, Polymorph and Mechanical Properties of Poly(vinylidene fluoride) Solution-Cast Membranes

2014 ◽  
Vol 1015 ◽  
pp. 536-539
Author(s):  
Jie Liu ◽  
Ji Ding Li ◽  
Xiao Long Lu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Vinylidene Fluoride ◽  
Dense Structure ◽  
Fluoride Solution ◽  
Evaporation Temperature ◽  
Α Phase ◽  
Poly Vinylidene Fluoride ◽  
Solution Cast ◽  
Solution Cast Method

In this study, PVDF membranes were prepared by solution-cast method. The effects of evaporation temperature on the morphology, polymorph and mechanical properties of such prepared membranes were studied. It was found that perfect spherulites were observed in the solution-cast membranes. FESEM photomicrographs of the membranes showed dense structure. PVDF mainly crystallized into α phase. In the solution-cast process, the spherulite size increased as evaporation temperature was increased from 120 °C to 150 °C, when the evaporation temperature was 165 °C, spherulite size decreased. And the tensile strength increased with the decrease in spherulite size.

New High-Dielectric-Constant Polymer-Ceramic Composites

2004 ◽  
Vol 847 ◽  
Author(s):  
Milind Arbatti ◽  
Xiaobing Shan ◽  
Z.-Y. Cheng
Keyword(s):  
Dielectric Constant ◽  
Vinylidene Fluoride ◽  
Ceramic Powder ◽  
Ceramic Composites ◽  
Flexible Composites ◽  
Giant Dielectric ◽  
Poly Vinylidene Fluoride ◽  
Solution Cast ◽  
Giant Dielectric Constant ◽  
High Dielectric

ABSTRACTA ceramic-powder polymer composite, making use of a newly developed ceramics - CaCu3Ti4O12 (CCTO) - that has a giant dielectric constant as the filler, is developed. In this work, poly(vinylidene fluoride - trifluoroethylene) [P(VDF-TrFE)] 55/45 mol% copolymer was used as matrix. It is found that the wettability between the copolymer and CCTO is poor, which makes the solution cast composites have a poor uniformity. The uniformity and thus the dielectric constant of the composites can be significantly improved by using hot-press technology to form “sandwich” structure. It is also found that the thermal annealing process can improve the dielectric constant of the composite. The experimental data show that for the flexible composites the dielectric constant at 1 kHz can reach more than 300 at room temperature and more than 700 at ∼70 °C.

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