Effect of polymer properties on poly(vinylidene fluoride) particles produced by rapid expansion of CO2+polymer mixtures

2009 ◽  
Vol 48 (1) ◽  
pp. 48-55 ◽  
Author(s):  
Eugenia Breininger ◽  
Muhammad Imran-ul-haq ◽  
Michael Türk ◽  
Sabine Beuermann
Keyword(s):  
Vinylidene Fluoride ◽  
Rapid Expansion ◽  
Polymer Mixtures ◽  
Polymer Properties ◽  
Poly Vinylidene Fluoride

scholarly journals Submicron Poly(vinylidene fluoride) Particles from Rapid Expansion of Supercritical Solution

2008 ◽  
Vol 80 (9) ◽  
pp. 1403-1404
Author(s):  
M. Türk ◽  
E. Breininger ◽  
S. Beuermann ◽  
M. Imran-ul-haq
Keyword(s):  
Vinylidene Fluoride ◽  
Rapid Expansion ◽  
Poly Vinylidene Fluoride ◽  
Supercritical Solution

Fabrication and Characterization of Carbon Nanotube Reinforced Poly(methyl methacrylate) Nanocomposites

2008 ◽  
Vol 8 (4) ◽  
pp. 1852-1857 ◽  
Author(s):  
Suzhu Yu ◽  
Yang Kang Juay ◽  
Ming Shyan Young
Keyword(s):  
Carbon Nanotube ◽  
Methyl Methacrylate ◽  
Vinylidene Fluoride ◽  
Decomposition Temperature ◽  
Third Party ◽  
Multiwall Carbon Nanotube ◽  
Melt Blending ◽  
Poly Methyl Methacrylate ◽  
Polymer Properties ◽  
Poly Vinylidene Fluoride

Multiwall carbon nanotube (CNT) reinforced poly(methyl methacrylate) (PMMA) nanocomposites have been successfully fabricated with melt blending. Two melt blending approaches of batch mixing and continuous extrusion have been used and the properties of the derived nanocomposites have been compared. The interaction of PMMA and CNTs, which is crucial to greatly improve the polymer properties, has been physically enhanced by adding a third party of poly(vinylidene fluoride) (PVDF) compatibilizer. It is found that the electrical threshold for both PMMA/CNT and PMMA/PVDF/CNT nanocomposites lies between 0.5 to 1 wt% of CNTs. The thermal and mechanical properties of the nanocomposites increase with CNTs and they are further increased by the addition of PVDF. For 5 wt% CNT reinforced PMMA/PVDF/CNT nanocomposite, the onset of decomposition temperature is about 17 °C higher and elastic modulus is about 19.5% higher than those of neat PMMA. Rheological study also shows that the CNTs incorporated in the PMMA/PVDF/CNT nanocomposites act as physical cross-linkers.

Reflectivity of Soft X-Rays by Polymer Mixtures

1988 ◽  
Vol 143 ◽  
Author(s):  
T. P. Russell ◽  
W. Jark ◽  
G. Comelli ◽  
J. Stöhr
Keyword(s):  
Phase Separation ◽  
Vinylidene Fluoride ◽  
Surface Films ◽  
X Rays ◽  
Polymer Mixtures ◽  
Energy Component ◽  
Annealing Conditions ◽  
Surface Behavior ◽  
Poly Vinylidene Fluoride ◽  
Profile Characteristic

AbstractThe specular reflectivty of soft x-rays has been used to investigate the surface behavior of mixtures of poly(vinylidene fluoride), PVF2, and poly(methyl methacrylate), PMMA. Mixtures where the concentration of PMMA is 0.8 where investigated as a function of the preparation and annealing conditions. It was found that mixtures prepared by rapidly casting from dimethylformamide, DMF, exhibited a gradient in the concentration of the two components. The gradient extended over large distances and was such that PMMA, the higher surface energy component was located preferentially at the surface. With annealing at 165°C, the width of the gradient diminished but the concentration of PMMA remained high at the surface. Films of the mixtures prepared under a slower solvent evaporation procedure produced a reflectivity profile characteristic of a phase separated mixture. The extent of phase separation was reduced with annealing. In all cases the roughness of the surface of the films was found to be 5.OÅ or less.

scholarly journals Crystal phase transformation of α into β phase poly(vinylidene fluoride) via particle formation caused by rapid expansion of supercritical solutions

RSC Advances ◽  
2015 ◽  
Vol 5 (82) ◽  
pp. 66644-66649 ◽  
Author(s):  
S. Wolff ◽  
F. Jirasek ◽  
S. Beuermann ◽  
M. Türk
Keyword(s):  
Phase Transformation ◽  
Vinylidene Fluoride ◽  
Piezoresponse Force Microscopy ◽  
Particle Formation ◽  
Rapid Expansion ◽  
Crystal Phase ◽  
Force Microscopy ◽  
Β Phase ◽  
Poly Vinylidene Fluoride ◽  
Crystal Phase Transformation

RESS enables the transformation from α to β phase PVDF. Piezoresponse force microscopy confirmed the piezoelectricity of the obtained particles.

Piezoelectric β-polymorph formation of new textiles by surface modification with coating process based on interfacial interaction on the conformational variation of poly (vinylidene fluoride) (PVDF) chains

2020 ◽  
Vol 91 (3) ◽  
pp. 31301
Author(s):  
Nabil Chakhchaoui ◽  
Rida Farhan ◽  
Meriem Boutaldat ◽  
Marwane Rouway ◽  
Adil Eddiai ◽  
...  
Keyword(s):  
High Efficiency ◽  
Vinylidene Fluoride ◽  
Research Work ◽  
Research Area ◽  
Interfacial Interaction ◽  
Tetraethyl Orthosilicate ◽  
Poly Vinylidene Fluoride ◽  
Carbon Nanofillers ◽  
The Impact ◽  
Advanced Applications

Novel textiles have received a lot of attention from researchers in the last decade due to some of their unique features. The introduction of intelligent materials into textile structures offers an opportunity to develop multifunctional textiles, such as sensing, reacting, conducting electricity and performing energy conversion operations. In this research work nanocomposite-based highly piezoelectric and electroactive β-phase new textile has been developed using the pad-dry-cure method. The deposition of poly (vinylidene fluoride) (PVDF) − carbon nanofillers (CNF) − tetraethyl orthosilicate (TEOS), Si(OCH2CH3)4 was acquired on a treated textile substrate using coating technique followed by evaporation to transform the passive (non-functional) textile into a dynamic textile with an enhanced piezoelectric β-phase. The aim of the study is the investigation of the impact the coating of textile via piezoelectric nanocomposites based PVDF-CNF (by optimizing piezoelectric crystalline phase). The chemical composition of CT/PVDF-CNC-TEOS textile was detected by qualitative elemental analysis (SEM/EDX). The added of 0.5% of CNF during the process provides material textiles with a piezoelectric β-phase of up to 50% has been measured by FTIR experiments. These results indicated that CNF has high efficiency in transforming the phase α introduced in the unloaded PVDF, to the β-phase in the case of nanocomposites. Consequently, this fabricated new textile exhibits glorious piezoelectric β-phase even with relatively low coating content of PVDF-CNF-TEOS. The study demonstrates that the pad-dry-cure method can potentially be used for the development of piezoelectric nanocomposite-coated wearable new textiles for sensors and energy harvesting applications. We believe that our study may inspire the research area for future advanced applications.

Effect of Carbon Nanotubes on the Shape Memory Performance of Poly(vinylidene fluoride)/Acrylic Blends

2013 ◽  
Vol 30 (2) ◽  
pp. 134
Author(s):  
Hui FU ◽  
Jishan QIU ◽  
Ning CHONG ◽  
Yaqing WANG ◽  
Yuanyuan TIAN ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Shape Memory ◽  
Vinylidene Fluoride ◽  
Memory Performance ◽  
Poly Vinylidene Fluoride
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