Abstract
Methacrylic acid (MAA) was grafted onto the surface of a poly(tetrafluoroethylene) (PTFE) plate by the combined use of the plasma treatment and photografting, and the adhesive strength between the MAA-grafted PTFE (PTFE-g-PMAA) plates with the same grafted amounts was investigated in relation to the location of grafting as well as the wettability and water absorptivity. The grafted amount at which the substrate breaking occurred at lower grafted amounts for the PTFE-g-PMAA plates prepared by the plasma treatment for shorter times before the photografting and by the photografting at higher monomer concentrations and/or at lower monomer concentrations after the plasma treatment. These grafting conditions are found to be factors affecting the location of photografting, the thickness and water absorptivity of the grafted layer, and wettability of the surface of the grafted layer. The substrate breaking was observed at the minimum grafted amount (about 2.2 µmol/cm2) for the PTFE-g-PMAA plates prepared at 2.0 M and 60°C after the plasma treatment for 10 s and at 2.0 M and 40°C after the plasma treatment for 120 s. The obtained results support that the combination of the oxygen plasma treatment with photografting of MAA is an effective procedure to enhance the adhesivity of the PTFE surface.
Highlights
Poly(tetrafluoroethylene) (PTFE) possesses good chemical and physical properties, such as thermal stability, chemical resistance, low water absorptivity, and low electrical conductivity [1, 2]
The effects of the grafting conditions, such as the plasma treatment time before the photografting and the monomer concentration and temperature on the photografting on the adhesive strength of the resultant PTFE-g-PMAA plates was discussed in relation to the wettability, water absorptivity, and location of grafting
As the photografting of Methacrylic acid (MAA) was performed at lower monomer concentrations or at lower temperatures after the plasma treatment for shorter treatment times, higher wettability was obtained at lower grafted amounts and the grafted layer formed on the PTFE surface possessed higher water absorptivity
Summary
Poly(tetrafluoroethylene) (PTFE) possesses good chemical and physical properties, such as thermal stability, chemical resistance, low water absorptivity, and low electrical conductivity [1, 2]. The grafted layers formed on these polymer substrates possess good water absorptivity, strongly depending on the location of photografting and/or length of grafted polymer chains. These characteristics can be controlled by the temperature and initial monomer concentration on the photografting [21, 22, 25]. The surface wettability of the MAA-grafted PTFE (PTFE-g-PMAA) plates and water absorptivity of the grafted layers formed on the PTFE plates were investigated as a function of the treatment conditions, such as the plasma treatment time and the monomer concentration and temperature on the photografting. The adhesive strength between the PTFE-g-PMAA plates with the same grafted amounts was investigated with an epoxy-type adhesive in relation to the location of grafting as well as the wettability and water absorptivity
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