Influence of Irradiation with Helium Ions on the Surface Properties of Kynar Polyvinylidene Fluoride

The experimental study of the kinetics of styrene monomer accumulation in polyvinylidene fluoride films with radiation-chemical grafting of styrene monomer is presented. It is proved that the degree of grafting depends on the absorbed dose of helium ions, temperature and composition of the grafting solution.

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Polymer Membranes for Hydrogen Fuel Cells

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.743.297 ◽

2017 ◽

Vol 743 ◽

pp. 297-302 ◽

Cited By ~ 4

Author(s):

Akbota Dyussembekova ◽

Valentina Sokhoreva

Keyword(s):

Polyvinylidene Fluoride ◽

Polymer Membranes ◽

Absorbed Dose ◽

Hydrogen Fuel Cells ◽

Hydrogen Fuel ◽

Helium Ions ◽

Radiation Chemical ◽

Styrene Monomer ◽

Chemical Grafting ◽

Kinetics Of

The purpose of this study is to improve the kinetics of styrene monomer accumulation in polyvinylidene fluoride films with radiation-chemical grafting of styrene monomer. The work has proved that the degree of grafting depends on the absorbed dose of helium ions, temperature and composition of the grafting solution.

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Effect of bombardment with helium ions on the molecular-topological structure and elemental composition of the surface of Kynar polyvinylidene fluoride resin

High Energy Chemistry ◽

10.1134/s0018143914030114 ◽

2014 ◽

Vol 48 (3) ◽

pp. 144-151 ◽

Cited By ~ 3

Author(s):

Yu. A. Ol’khov ◽

S. R. Allayarov ◽

K. I. Muntele ◽

D. A. Dixon

Keyword(s):

Elemental Composition ◽

Topological Structure ◽

Polyvinylidene Fluoride ◽

Helium Ions

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On programming of polyvinylidene fluoride–limestone composite for four-dimensional printing applications in heritage structures

Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design and Applications ◽

10.1177/14644207211044298 ◽

2021 ◽

pp. 146442072110442

Author(s):

Vinay Kumar ◽

Rupinder Singh ◽

Inderpreet Singh Ahuja

Keyword(s):

Surface Properties ◽

Polyvinylidene Fluoride ◽

Chemical Weathering ◽

Carbonic Acid ◽

Three Dimensional ◽

Thermoplastic Composite ◽

Thermoplastic Composites ◽

Public Authorities ◽

Maintenance And Repair ◽

Dimensional Printing

Heritage structures are under the effect of chemical, physical and biological weathering, and out of these common effects, chemical weathering has a significant impact (as it results in nifty formation and causes fractures in heritage structures). Chemical weathering may include carbonation, oxidation, hydration, hydrolysis, and acidification. Most heritage structures are made up of limestone, which is more susceptible to carbonation. According to the reported literature, commercial practices for the maintenance and repair of these heritage structures use epoxy-based solutions, which may not be best suited as per the various regulations imposed by different government/public authorities. But so far little has been reported on the use of innovative, programmable thermoplastic composites for the maintenance and repair of such structures. This study highlights the effect of chemical treatment (as a stimulus) using a one-way programming of three-dimensional-printed thermoplastic composite-based (polyvinylidene fluoride–6% limestone) functional prototype as a solution for the maintenance and repair of heritage structures (grade III). For one-way programming, three-dimensional-printed substrate is exposed to dimethylformamide, and the changes in morphological and surface properties are noticed. After this, carbonation cycle (with carbonic acid) is performed and the changes in morphological and surface properties are compared to ascertain the stimulus effect for one-way programming (of polyvinylidene fluoride–6% limestone composite). The results of the study outline that the prepared composite may be programmed by controlling the exposure of dimethylformamide and carbonic acid (as a stimulus). Further best settings for preparing feedstock filament (for three-dimensional printing of functional prototypes in case of a selected heritage structure) are 200 °C screw temperature, 0.35 N m torque and an applied load of 8 kg in terms of better mechanical properties and shore D hardness.

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Non-Equilibrium Plasma Methods for Tailoring Surface Properties of Polyvinylidene Fluoride: Review and Challenges

Polymers ◽

10.3390/polym13234243 ◽

2021 ◽

Vol 13 (23) ◽

pp. 4243

Author(s):

Alenka Vesel ◽

Rok Zaplotnik ◽

Gregor Primc ◽

Miran Mozetič ◽

Tadeja Katan ◽

...

Keyword(s):

Surface Modification ◽

Surface Properties ◽

Photoelectron Spectroscopy ◽

Polyvinylidene Fluoride ◽

Polymer Surface ◽

Argon Plasma ◽

Standard Technique ◽

Water Contact ◽

Plasma Methods ◽

Non Equilibrium

Modification and functionalization of polymer surface properties is desired in numerous applications, and a standard technique is a treatment with non-equilibrium gaseous plasma. Fluorinated polymers exhibit specific properties and are regarded as difficult to functionalize with polar functional groups. Plasma methods for functionalization of polyvinylidene fluoride (PVDF) are reviewed and different mechanisms involved in the surface modification are presented and explained by the interaction of various reactive species and far ultraviolet radiation. Most authors used argon plasma but reported various results. The discrepancy between the reported results is explained by peculiarities of the experimental systems and illustrated by three mechanisms. More versatile reaction mechanisms were reported by authors who used oxygen plasma for surface modification of PVDF, while plasma sustained in other gases was rarely used. The results reported by various authors are analyzed, and correlations are drawn where feasible. The processing parameters reported by different authors were the gas pressure and purity, the discharge configuration and power, while the surface finish was predominantly determined by X-ray photoelectron spectroscopy (XPS) and static water contact angle (WCA). A reasonably good correlation was found between the surface wettability as probed by WCA and the oxygen concentration as probed by XPS, but there is hardly any correlation between the discharge parameters and the wettability.

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Biological and Surface Properties of C-Type Virus Particles Produced by Novikoff Ascites Hepatoma Cells

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100079395 ◽

1977 ◽

Vol 35 ◽

pp. 388-389

Author(s):

D.C. Hixson ◽

J.C. Chan ◽

J.M. Bowen ◽

E.F. Walborg

Keyword(s):

Surface Properties ◽

Ricinus Communis ◽

Rat Kidney ◽

Leukemia Virus ◽

Viral Envelope ◽

Virus Particles ◽

Chemically Induced ◽

Sarcoma Virus ◽

Hepatocarcinoma Cells ◽

Type C

Several years ago Karasaki (1) reported the production of type C virus particles by Novikoff ascites hepatocarcinoma cells. More recently, Weinstein (2) has reported the presence of type C virus particles in cell cultures derived from transplantable and primary hepatocellular carcinomas. To date, the biological function of these virus and their significance in chemically induced hepatocarcinogenesis are unknown. The present studies were initiated to determine a possible role for type C virus particles in chemically induced hepatocarcinogenesis. This communication describes results of studies on the biological and surface properties of type C virus associated with Novikoff hepatocarcinoma cells.Ecotropic and xenotropic murine leukemia virus (MuLV) activity in ascitic fluid of Novikoff tumor-bearing rats was assayed in murine sarcoma virus transformed S+L- mouse cells and S+L- mink cells, respectively. The presence of sarcoma virus activity was assayed in non-virus-producing normal rat kidney (NRK) cells. Ferritin conjugates of concanavalin A (Fer-Con wheat germ agglutinin (Fer-WGA), and Ricinus communis agglutinins I and II (Fer-RCAI and Fer-RCAII) were used to probe the structure and topography of saccharide determinants present on the viral envelope.

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Inelastic scattering at surfaces and interfaces

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100143560 ◽

1986 ◽

Vol 44 ◽

pp. 392-393

Author(s):

R. H. Ritchie ◽

A. Howie

Keyword(s):

Inelastic Scattering ◽

Surface Properties ◽

Correlation Energy ◽

Condensed Matter ◽

Charged Particles ◽

Condensed Matter Physics ◽

Optical Phonons ◽

Exchange Correlation ◽

Surfaces And Interfaces ◽

Inelastic Interactions

An important part of condensed matter physics in recent years has involved detailed study of inelastic interactions between swift electrons and condensed matter surfaces. Here we will review some aspects of such interactions.Surface excitations have long been recognized as dominant in determining the exchange-correlation energy of charged particles outside the surface. Properties of surface and bulk polaritons, plasmons and optical phonons in plane-bounded and spherical systems will be discussed from the viewpoint of semiclassical and quantal dielectric theory. Plasmons at interfaces between dissimilar dielectrics and in superlattice configurations will also be considered.

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