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.

Effect of the Cooling Rate on Crystallinity and Tensile Strength of Two PVDF Grades

2015 ◽  
Author(s):  
Caroline Slikta Velloso ◽  
Geovanio Lima de Oliveira ◽  
Christine Rabello Nascimento ◽  
Celio Albano da Costa Neto
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Cooling Rate ◽  
Vinylidene Fluoride ◽  
Processing Technique ◽  
Processing Conditions ◽  
Poly Vinylidene Fluoride ◽  
Fast Cooling

The PVDF (poly(vinylidene fluoride)) is the recommended material for pressure barrier application when the temperature is above 90 C and below 130 C (API Specification 17J). Two grades of PVDFs used in flexible raisers were processed. The grades selected were those for extrusion, but they were compression molded instead. The processing conditions were the same for each grade, from slow to fast cooling rate. The results allowed the evaluation of their performance using a simpler processing technique and, also, to observe how the mechanical properties varied with the cooling rate applied.

Preparation of poly(vinylidene fluoride)-silver nanoparticle composite using dimethylformide as both a solvent and a reductant

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Yingbo Chen ◽  
Lina Liu ◽  
Yufeng Zhang
Keyword(s):  
Mechanical Properties ◽  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Vinylidene Fluoride ◽  
Silver Salt ◽  
Α Phase ◽  
Phase Crystal ◽  
Poly Vinylidene Fluoride ◽  
Pure Pvdf

AbstractPoly(vinylidene fluoride)-silver nanoparticle (PVDF-Ag) composites were synthesized by in situ reduction of silver salt using dimethylformide (DMF) as both a solvent and a reductant. The crystalline properties (e.g., crystallinity and the types of crystals) of the composites were characterized. It was shown that PVDF in the composites had a higher melting temperature than pure PVDF, and the α phase crystal in the composites became more stable with an increase in the amount of silver nanoparticles. The mechanical properties and morphologies of the composites were also investigated. It was noted that the PVDF-Ag composites have better mechanical properties when silver nanoparticles were added. The increase in toughness could be attributed to the formation of continuous structure between PVDF and silver particles.

scholarly journals Thermal treatment for nanofibrous membrane

2014 ◽  
Vol 18 (5) ◽  
pp. 1685-1687 ◽  
Author(s):  
Hong-Ying Liu ◽  
Lan Xu ◽  
Na Si ◽  
Xiao-Peng Tang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Thermal Treatment ◽  
Physical Properties ◽  
Electrolyte Solution ◽  
Vinylidene Fluoride ◽  
High Porosity ◽  
Treatment Results ◽  
Poly Vinylidene Fluoride ◽  
Solution Uptake

Poly(vinylidene fluoride) nanofibrous membranes with high porosity, large electrolyte solution uptake, and adequate mechanical properties were prepared by electrospinning. The physical properties of the electrospun poly(vinylidene fluoride) membranes can be improved by thermal treatment. Results showed after the thermal treatment, there had appeared ever-increasing tensile strength and elongation of the poly(vinylidene fluoride) membranes. The crystal structures of poly(vinylidene fluoride) fibers were greatly improved.

Effect of evaporation temperature on the crystalline properties of solution-cast films of poly(vinylidene fluoride)s

2003 ◽  
Vol 20 (5) ◽  
pp. 934-941 ◽  
Author(s):  
Kwang Man Kim ◽  
Woo Sung Jeon ◽  
Nam-Gyu Park ◽  
Kwang Sun Ryu ◽  
Soon Ho Chang
Keyword(s):  
Vinylidene Fluoride ◽  
Evaporation Temperature ◽  
Cast Films ◽  
Poly Vinylidene Fluoride ◽  
Solution Cast

The Irradiation Crosslinking of Poly(vinylidene fluoride-​chlorotrifluoroethylene)

2014 ◽  
Vol 716-717 ◽  
pp. 7-10
Author(s):  
Jian Chen
Keyword(s):  
Mechanical Properties ◽  
Storage Modulus ◽  
Ultraviolet Irradiation ◽  
Vinylidene Fluoride ◽  
Loss Modulus ◽  
Great Influence ◽  
Poly Vinylidene Fluoride ◽  
Content Support

Vinylidenefluoride (VDF) and chlorotrifluoroethylene (CTFE) copolymers were crosslinked by ultraviolet irradiation, chlorotrifluoroethylene content has a great influence on the crosslinked copolymers, high CTFE content support more joint pots, the properties of the copolymer shows higher storage modulus, the loss modulus gets smaller. The copolymer mechanical properties gets much higher.

Three-Dimensional Graphite Filled Poly(Vinylidene Fluoride) Composites with Enhanced Strength and Thermal Conductivity

2020 ◽  
Vol 842 ◽  
pp. 63-68
Author(s):  
Xiao Zhang ◽  
Jian Zheng ◽  
Yong Qiang Du ◽  
Chun Ming Zhang
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Energetic Materials ◽  
High Performance ◽  
Vinylidene Fluoride ◽  
3D Structure ◽  
Three Dimensional ◽  
3D Network ◽  
Poly Vinylidene Fluoride ◽  
Polymer Bonded Explosives

Three-dimensional (3D) network structure has been recognized as an efficient approach to enhance the mechanical and thermal conductive properties of polymeric composites. However, it has not been applied in energetic materials. In this work, a fluoropolymer based composite with vertically oriented and interconnected 3D graphite network was fabricated for polymer bonded explosives (PBXs). Here, the graphite and graphene oxide platelets were mixed, and self-assembled via rapid freezing and using crystallized ice as the template. The 3D structure was finally obtained by freezing-dry, and infiltrating with polymer. With the increasing of filler fraction and cooling rate, the thermal conductivity of the polymer composite was significantly improved to 2.15 W m-1 K-1 by 919% than that of pure polymer. Moreover, the mechanical properties, such as tensile strength and elastic modulus, were enhanced by 117% and 563%, respectively, when the highly ordered structure was embedded in the polymer. We attribute the increased thermal and mechanical properties to this 3D network, which is beneficial to the effective heat conduction and force transfer. This study supports a desirable way to fabricate the strong and thermal conductive fluoropolymer composites used for the high-performance polymer bonded explosives (PBXs).

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