Improving Properties of Poly(vinylidene fluoride) by Adding Expanded Graphite without Surface Modification via Water‐Assisted Mixing Extrusion

2020 ◽  
Vol 305 (8) ◽  
pp. 2000270 ◽  
Author(s):  
Jun Tong ◽  
Wei Li ◽  
Hai‐Chu Chen ◽  
Ling‐Cao Tan
Keyword(s):  
Surface Modification ◽  
Vinylidene Fluoride ◽  
Expanded Graphite ◽  
Poly Vinylidene Fluoride

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.

Thermal conductivity of poly vinylidene fluoride composites filled with expanded graphite and carbon nanotubes

2012 ◽  
Vol 127 (3) ◽  
pp. 1697-1702 ◽  
Author(s):  
Qing-Liang Shou ◽  
Ji-Peng Cheng ◽  
Ji-Hong Fang ◽  
Fei-Hong Lu ◽  
Jia-Jie Zhao ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Vinylidene Fluoride ◽  
Expanded Graphite ◽  
Poly Vinylidene Fluoride

Fabrication and properties of PVDF/expanded graphite nanocomposites

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Yuchao Li ◽  
R. K. Y. Li ◽  
S. C. Tjong
Keyword(s):  
Dielectric Constant ◽  
Percolation Threshold ◽  
Structural Changes ◽  
Vinylidene Fluoride ◽  
Expanded Graphite ◽  
Nucleating Agent ◽  
X Ray Diffraction ◽  
Melt Mixing ◽  
Poly Vinylidene Fluoride ◽  
Higher Temperature

AbstractPoly(vinylidene fluoride) (PVDF) nanocomposites filled with various expanded graphite (EG) contents were prepared via melt-mixing followed by hotpressing. The structure, electrical, and thermal properties of resulting nanocomposites were investigated. X-ray diffraction results indicated that the EG additions do not lead to structural changes of PVDF. Differential thermal calorimetry measurements revealed that EG act as a nucleating agent for PVDF molecular chains. The crystallization temperature shifted to higher temperature with increasing EG content. DMA results showed that the storage modulus and glass transition temperature can be enhanced by adding EG. The nanocomposites were found to exhibit a small percolation threshold of 6.3 vol% due to the large aspect ratio of graphite nano-sheets. A great enhancement of dielectric constant is also found as EG concentration approaches percolation threshold. Both the electrical conductivity and dielectric constant of PVDF/EG nanocomposites can be well described by the percolation theory.

EUV induced ablation and surface modification of poly(vinylidene fluoride) irradiated in vacuum or gaseous environment

2013 ◽  
Author(s):  
Andrzej Bartnik ◽  
Wojciech Lisowski ◽  
Janusz Sobczak ◽  
Przemyslaw Wachulak ◽  
Boguslaw Budner ◽  
...  
Keyword(s):  
Surface Modification ◽  
Vinylidene Fluoride ◽  
Gaseous Environment ◽  
Poly Vinylidene Fluoride
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