Melt Crystallization of Nanocomposites of Poly(Vinylidene Fluoride) with OMS

2006 ◽  
Vol 949 ◽  
Author(s):  
Bedriye Seyhan Ince-Gunduz ◽  
Debeshu Amare ◽  
Robert Alpern ◽  
Peggy Cebe ◽  
Jennifer Crawford ◽  
...  
Keyword(s):  
Growth Rate ◽  
Melting Point ◽  
Optical Microscopy ◽  
Vinylidene Fluoride ◽  
Crystallinity Index ◽  
Beta Phase ◽  
Alpha Phase ◽  
Melt Crystallization ◽  
Poly Vinylidene Fluoride ◽  
The Impact

ABSTRACTIn our previous work [1] we investigated the impact of cold-crystallization on the structure of nanocomposites of PVDF with Lucentite STN™ OMS and observed the crossover composition in which the crystallographic beta phase dominated over alpha phase. Here, melt crystallization of PVDF/OMS nanocomposites was studied in the range of 0 to 1.0 wt% of OMS. In crystallization from melt, a decrease in crystallinity index occurs as a result of an increase in OMS. While beta phase fraction increased with an increase of OMS content in the range of interest, the amount of alpha crystals was found to be dominant even at high OMS compositions. At 1.0 wt% of OMS, beta crystals had reached at most 30% of the total crystallinity. Polarizing optical microscopy (POM) studies showed smaller, less birefringent spherulites with higher melting temperature compared to alpha spherulites appeared with OMS addition. Growth rate of these weakly birefringent spherulites is smaller than that of the strongly birefringent alpha spherulites. The increase in size and amount of the weakly birefringent spherulites with an increase of OMS and their higher melting point suggests these spherulites may be in the beta crystallographic phase.

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.

scholarly journals Surface Modification of PLLA, PTFE and PVDF with Extreme Ultraviolet (EUV) to Enhance Cell Adhesion

2020 ◽  
Vol 21 (24) ◽  
pp. 9679
Author(s):  
Adam Lech ◽  
Beata A. Butruk-Raszeja ◽  
Tomasz Ciach ◽  
Krystyna Lawniczak-Jablonska ◽  
Piotr Kuzmiuk ◽  
...  
Keyword(s):  
Surface Modification ◽  
Cell Adhesion ◽  
Endothelial Cell ◽  
Vinylidene Fluoride ◽  
Extreme Ultraviolet ◽  
Cell Number ◽  
Laboratory System ◽  
Poly Vinylidene Fluoride ◽  
The Impact ◽  
Endothelial Cell Adhesion

Recently, extreme ultraviolet (EUV) radiation has been increasingly used to modify polymers. Properties such as the extremely short absorption lengths in polymers and the very strong interaction of EUV photons with materials may play a key role in achieving new biomaterials. The purpose of the study was to examine the impact of EUV radiation on cell adhesion to the surface of modified polymers that are widely used in medicine: poly(tetrafluoroethylene) (PTFE), poly (vinylidene fluoride) (PVDF), and poly-L-(lactic acid) (PLLA). After EUV surface modification, which has been performed using a home-made laboratory system, changes in surface wettability, morphology, chemical composition and cell adhesion polymers were analyzed. For each of the three polymers, the EUV radiation differently effects the process of endothelial cell adhesion, dependent of the parameters applied in the modification process. In the case of PVDF and PTFE, higher cell number and cellular coverage were obtained after EUV radiation with oxygen. In the case of PLLA, better results were obtained for EUV modification with nitrogen. For all three polymers tested, significant improvements in endothelial cell adhesion after EUV modification have been demonstrated.

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

A Lab-on-a-Chip for Clinical Analysis with Acoustic Microagitation based on Piezoelectric Poly(Vinilidene Fluoride)

2008 ◽  
Vol 1138 ◽  
Author(s):  
P. Martins ◽  
V. Cardoso ◽  
J. Serrado Nunes ◽  
L. Rebouta ◽  
G. Rocha ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Biological Fluids ◽  
Point Of Care ◽  
Lab On A Chip ◽  
Beta Phase ◽  
Clinical Analysis ◽  
Fully Integrated ◽  
Quantitative Measurements ◽  
Novel Approach ◽  
Poly Vinylidene Fluoride

AbstractThis paper reports on the incorporation and validation of a microagitation system based on a piezoelectric polymer, Poly(vinylidene fluoride) in its beta phase, β-PVDF, in a fully-integrated disposable lab-on-a-chip for point-of-care testing and monitoring of biochemical parameters in biological fluids. The lab-on-a-chip concept offers a novel approach for clinical analyses, especially in biological fluids analyses, due to its portability, ensuring that the analysis can be performed at any location with quick results. Its microagitation system performance was successfully demonstrated by quantitative measurements of uric acid in human urine, though other molecules or biological fluids can be also measured. The optimization tests prove that it is possible to use lower frequencies than resonance with no major changes in the mixing process. The effect of area and location within the lab-on-a-chip of the microagitation system was also considered.

Influence of the Crystallisation Kinetics on the Microstructural Properties of α-PVDF

2006 ◽  
Vol 949 ◽  
Author(s):  
Marco Pinto Silva ◽  
Vitor Sencadas ◽  
Anabela G Rolo ◽  
Gabriela Botelho ◽  
Ana Vera Machado ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Alpha Phase ◽  
Degree Of Crystallinity ◽  
Infrared Transmission ◽  
Crystallisation Kinetics ◽  
Poly Vinylidene Fluoride ◽  
Different Temperatures ◽  
Kinetics Of ◽  
The Degree Of Crystallinity ◽  
Crystallization From The Melt

ABSTRACTThe kinetics of the isothermal crystallization from the melt at different crystallisation temperatures and the melting behaviour of Poly(vinylidene fluoride) (PVDF) in the alpha phase has been investigated. The variation of the microstructure of the samples crystallized at different temperatures was monitored with time by Optical Microscopy. The correlation between microstructure and kinetic parameters allows the tailoring of the microstructure by choosing the crystallisation conditions of the samples. Raman and Infrared Transmission Spectroscopy also show the appearance of the γ-phase for higher crystallisation temperatures. The influence of the crystallisation kinetics on the degree of crystallinity of the samples will be also presented and discussed.

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