Oxygen plasma surface treatment of polymer powder in a fluidized bed reactor

Park, Soung Hee; Kim, Sang Done

doi:10.1016/s0927-7757(97)00109-x

Cited by 27 publications

(21 citation statements)

References 15 publications

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“…The plasma functionalization of PTFE powders leads to an increase in the surface free energy enhances the dispersion of the polymer powders via increase in the dispersive component. Park et al [ 35 ] have reported that there is a correlation between the incorporation of functional groups and the atomic structure and hydrophilicity (wettability). The decrease of the contact angle is mainly due to the change in the surface concentration of the polar moieties.…”

Section: Resultsmentioning

confidence: 99%

Low-Pressure H2, NH3 Microwave Plasma Treatment of Polytetrafluoroethylene (PTFE) Powders: Chemical, Thermal and Wettability Analysis

et al. 2015

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Functionalization of Polytetrafluoroethylene (PTFE) powders of ~6 μm particle size is carried out using low-pressure 2.45 GHz H2, NH3 microwave plasmas for various durations (2.5, 10 h) to chemically modify their surface and alter their surface energy. The X-ray Photoelectron Spectroscopy (XPS) analyses reveal that plasma treatment leads to significant defluorination (F/C atomic ratio of 1.13 and 1.30 for 10 h NH3 and H2 plasma treatments, respectively vs. 1.86 for pristine PTFE), along with the incorporation of functional polar moieties on the surface, resulting in enhanced wettability. Analysis of temperature dependent XPS revealed a loss of surface moieties above 200 °C, however, the functional groups are not completely removable even at higher temperatures (>300 °C), thus enabling the use of plasma treated PTFE powders as potential tribological fillers in high temperature engineering polymers. Ageing studies carried over a period of 12 months revealed that while the surface changes degenerate over time, again, they are not completely reversible. These functionalised PTFE powders can be further used for applications into smart, high performance materials such as tribological fillers for engineering polymers and bio-medical, bio-material applications.

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Section: Resultsmentioning

confidence: 99%

Low-Pressure H2, NH3 Microwave Plasma Treatment of Polytetrafluoroethylene (PTFE) Powders: Chemical, Thermal and Wettability Analysis

et al. 2015

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“…It can tailor the interfacial properties between reinforcement and matrix. Up‐to‐date, although most reports focus on the plasma treatment on the synthetic polymer powder and the fine inorganic metal powders, few work have been reported on plasma treatment of natural organic powder made from natural fiber [24–27].…”

Section: Introductionmentioning

confidence: 99%

Effect of plasma treatment of silk fibroin powder on the properties of silk fibroin powder/polyurethane blend film

Zhu

et al. 2010

Polymer Engineering & Sci

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In this study, silk fibroin powder was treated by dielectric barrier discharge (DBD) plasma. The objective is to improve the performance of the silk fibroin powder/ polyurethane (PU) blend film used in biomechanical field. The scanning electron microscope (SEM) showed that the plasma-treated powder was broken into small particles and the film from the treated powder became homogeneous and dense. Fourier transform infrared spectroscopy (FTIR) revealed that the hydrophobic groups in silk fibroin powder were oxidized during plasma treatment. Little change in chemical composition was found on the surface of the blend film from plasma-treated powder. The fracture strain of the blend film from plasma-treated powder was remarkably raised, whereas its tensile strength was influenced significantly by the plasma treatment conditions. The wetout time of the plasma-treated powder/PU film was shortened considerably. This indicates the improved hydrophilicity of the blend film. In addition, the decreased values of water vapor permeability suggested that the structure of the blend film became dense. This might result from the strong interfacial adhesion between plasma-treated powder and PU. FIG. 11. The effect of power density on the water vapor permeability of blend film from the silk fibroin powder treated for 2 min.

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“…However, the tailoring of their surface properties is a prerequisite for the success of these applications. Specific functional groups can be introduced either by grafting new chemical moieties1–5 or by plasma deposition of a polymeric film 6–12. Cold plasma processing, in particular, is a very efficient and practical method to modify the topmost layer of polymeric materials without altering their bulk properties.…”

Section: Introductionmentioning

confidence: 99%

Plasma Deposition of Allylamine on Polymer Powders in a Fluidized Bed Reactor

Tatoulian

Bretagnol

Arefi‐Khonsari

et al. 2004

Plasma Processes & Polymers

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Summary: Thin films of plasma‐polymerized allylamine (PPAA) have been deposited onto polyethylene powders (PE) and polystyrene (PS) beads by using a low‐pressure 13.56 MHz plasma in a fluidized bed reactor. Chemical derivatization using a set of three different blocking agents has allowed quantitative measurement of the relative percentages of primary, secondary, and tertiary amines. Under optimized conditions, it is possible to incorporate up to 110 nmol of amine groups per gram of powder and with a selectivity of 75% for primary amines. Moreover, our data clearly show that for films deposited at 10 W the selectivity for primary amines is at a maximum, but this is at the expense of resistance to washing. A power of 20 W corresponds to an optimum value since both the amount of primary amines and the degree of resistance of the coating to solvents reach maximum values.

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Oxygen plasma surface treatment of polymer powder in a fluidized bed reactor

Cited by 27 publications

References 15 publications

Low-Pressure H2, NH3 Microwave Plasma Treatment of Polytetrafluoroethylene (PTFE) Powders: Chemical, Thermal and Wettability Analysis

Low-Pressure H2, NH3 Microwave Plasma Treatment of Polytetrafluoroethylene (PTFE) Powders: Chemical, Thermal and Wettability Analysis

Effect of plasma treatment of silk fibroin powder on the properties of silk fibroin powder/polyurethane blend film

Plasma Deposition of Allylamine on Polymer Powders in a Fluidized Bed Reactor

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