Wettability of ultraviolet excimer-exposed PE, PI and PTFE films determined by the contact angle measurements

Gotoh, Kunihito; Nakata, Yumiko; Tagawa, Masatoshi; Tagawa, Mieko

doi:10.1016/s0927-7757(03)00263-2

Cited by 75 publications

(42 citation statements)

References 31 publications

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“…Whereas the use of chemical solvents or primers involves the generation of toxic waste, and mechanical treatments lead to heterogeneous surfaces, plasma is a fast, environmentally friendly and dry process. Atmospheric pressure plasma torches (APPT) [17,20] are non LTE devices which mainly produce cleaning by means of the breakdown of pollutants, etching and surface activation [22] due to the introduction of different moieties of polar nature [23 25] ( OH, COOH, C O, NH) which significantly increase γ s and therefore, the adhesion properties of polymers [26,40]. The decrease of γ s to the original values during prolonged storage, due to the fact that all interfaces have a thermodynamic tendency to minimise γ s through different processes, has been previously studied [27 31,36,39].…”

Section: Introductionmentioning

confidence: 99%

Extreme durability of wettability changes on polyolefin surfaces by atmospheric pressure plasma torch

Encinas

Díaz-Benito

Abenójar

et al. 2010

Surface and Coatings Technology

105

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Institutional RepositoryThis is a postprint version of the following published document: In the present work three common polyolefins: high density polyethylene (HDPE), low density polyethylene (LDPE) and polypropylene (PP) have been treated with an atmospheric pressure air plasma torch (APPT) in order to improve their wettability properties. The variations in surface energy (γ s ), as well as the durability of the treatment are determined by means of contact angle measurements for different aging times after plasma exposure (up to 270 days) using five test liquids which cover a wide range of polarities. The introduction of new polar moieties (carbonyl, amine or hydroxyl) is confirmed by Fourier transform infrared spectroscopy in attenuated total multiple reflection mode (ATR FTIR) and X ray photoelectron spectroscopy (XPS). Furthermore, scanning electron microscopy (SEM) provides information on the morphological changes and variation on surface roughness, revealing that smoother, lamellar and semispheric micrometric structures are created on the LDPE, HDPE and PP surfaces, respectively. Results show that APPT treatment enhances both the total and polar components of the γ s under study, with an unprecedent stability (N 8 months) in time.

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Section: Introductionmentioning

confidence: 99%

Extreme durability of wettability changes on polyolefin surfaces by atmospheric pressure plasma torch

Encinas

Díaz-Benito

Abenójar

et al. 2010

Surface and Coatings Technology

105

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“…The choice of the surface treatment should consider several factors, including the size and geometry of surface, the necessary and available instrumentation, stability of material to be treated, and the possibility of surface migration. These processes include mechanical or chemical methods or exposure to f ames and corona discharge [19][20][21][22][23][24]. The f nal f nish and texture of the surface determines the wearability, lubrication, fatigue resistance, and external appearance of the material.…”

mentioning

confidence: 99%

Control of Wettability of Polymers by Surface Roughness Modification

Encinas

Pantoja

Abenójar

et al. 2010

Journal of Adhesion Science and Technology

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AbstnctMost polymeric materials, particularly polyolefins and their derivatives, present a low surface energy which is the cause of their poor wettability and limits processes such as adhesive bonding, painting, or metalizing. Many methods have been developed and used to modify polymer surfaces for improved wetting, including mechanical treatments, wet-chemical treatments with strong acids or bases, and exposure to flames or corona discharge.In this paper the improvement of wetting properties of several polymeric materials widely used in the auto motive industry, such as high density polyethylene (}IDPE), low density polyethylene (LDPE), polypropy lene (PP) and silicone, is studied by means of surface mechanical abrasion using sandpapers of different grain sizes (1000, 180 and 80). Measurements of the surface roughness are performed using a Hommel Tester T8000 device equipped with a diamond stylus, which provides data on the arithmetic average rough ness Ra parameter and Abbott-Firestone curve. Variations in the polymers surface energy (SE) are estimated through contact angle measurements using five test liquids of different polarities. Both components of the SE, dispersion (a D ) and polar (a P ), as well as total (a T) at different conditions of treatment are analyzed using the Owens-Wendt-Rabel-Kaelble (OWRK) method. Morphological changes induced in the surface are analyzed by Scanning Electron Microscopy (SEM). Additionally, measurements of the static fr iction coefficient(µ,.) are carried out by the standard method ASTM D 1894-08. A slight enhancement in surface wettability is found with the mechanical abrasion pre-treatment fr om the SE increase. Finally, a higher value of µ, 5 is achieved for the abraded specimens as the normal force acting onto the system is increased.

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“…The PE film surface was exposed to the UV light located 2 mm away from the window. In the previous study 18,19) , the water contact angle on some polymer films decreased with UV irradiation time and showed saturation at 30-60 sec. Therefore, in the present study, the PE film was exposed to UV for 1 min.…”

mentioning

confidence: 82%

“…In the initial stage, the contact angle decreased linearly with time and the drop base diameter slightly increased. Therefore, the contact angle obtained by extrapolating the measured angles to time zero was obtained to be the advancing contact angle 18) . In the measurement of the surface free energy, the liquid was dispensed from the microsyringe to form a pendant drop, which was made as big as possible without letting it fall off the tip of the needle.…”

mentioning

confidence: 99%

A Quartz Crystal Microbalance Simulation to Examine the Effect of Ultraviolet Light Treatment on Characteristics of Polyethylene Surface

2008

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Wettability of ultraviolet excimer-exposed PE, PI and PTFE films determined by the contact angle measurements

Cited by 75 publications

References 31 publications

Extreme durability of wettability changes on polyolefin surfaces by atmospheric pressure plasma torch

Extreme durability of wettability changes on polyolefin surfaces by atmospheric pressure plasma torch

Control of Wettability of Polymers by Surface Roughness Modification

A Quartz Crystal Microbalance Simulation to Examine the Effect of Ultraviolet Light Treatment on Characteristics of Polyethylene Surface

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