Estimation of surface free energies and hamaker constants for fibrous solids by wetting force measurements

Tagawa, Mieko; Gotoh, Kunihito; Yasukawa, Akemi; Ikuta, Mitsuhiro

doi:10.1007/bf01410301

Cited by 41 publications

(18 citation statements)

References 16 publications

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“…Advancing and receding contact angles were calculated from the wetting forces during fiber immersion and emergence. The dispersive and polar components of surface free energies of the fibers were determined from the advancing and receding contact angles, respectively [29]. The circumferential dimension of Kevlar 49 single fibers, their wetting force and work of adhesion with an epoxy resin were evaluated by Hsieh et al [45].…”

Section: Wilhelmy Methodsmentioning

confidence: 99%

Wetting and Wicking in Fibrous Materials

Patnaik¹,

Rengasamy²,

Kothari³

et al. 2006

Textile Progress

191

143

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Section: Wilhelmy Methodsmentioning

confidence: 99%

Wetting and Wicking in Fibrous Materials

Patnaik¹,

Rengasamy²,

Kothari³

et al. 2006

Textile Progress

191

143

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“…[16] The advancing and receding contact angles on the film were calculated from the advancing and receding wetting forces, respectively, using the Wilhelmy equation. [21] The Lifshitz-van der Waals component and the Lewis acid and base parameters of the films were calculated from the advancing contact angles obtained with water, diiodomethane, and ethylene glycol, and their respective surface free energy components. [22,23] The contact angle measurements were performed in a room maintained at 20°C and 65% RH.…”

Section: Contact Angle Measurementmentioning

confidence: 99%

Surface hydrophilization of two polyester films by atmospheric-pressure plasma and ultraviolet excimer light exposures

Gotoh

Yonehara

et al. 2015

Journal of Adhesion Science and Technology

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Polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) films were treated with an atmospheric-pressure plasma (APP) jet and a 172-nm ultraviolet (UV) excimer light in air. The advancing and receding water contact angles on both films decreased after the treatments, especially after APP treatment. After the treatments, the hydrophobic recovery was observed and almost diminished within a week. The dispersive component of the surface free energy of the two polyester films did not change due to the APP and UV exposure, whereas the acid-base component drastically increased after the treatments. The X-ray photoelectron spectroscopy results showed that the polyester film surfaces were oxidized by the treatments. From the AFM images, the topographical change on the film surfaces due to the treatments was clearly observed. It was found that the APP treatment of the PET film prevented the deposition of particulate soils in air due to the decrease in the contact area between the film and the soil particle. Furthermore, the soil release in the aqueous solutions was promoted as a result of the hydrophilization of the polyester films due to the APP treatment. IntroductionPolyethylene terephthalate (PET) has high strength, high resilience, good impact resistance, and outstanding processability. Because of its many applications, PET is one of the most common plastics available today. One of the most common applications is for drink bottles, including those for soft drinks. PET films are used for balloons, flexible food packaging, space blankets, and as a carrier for magnetic tape, or a backing for pressure-sensitive adhesive tape. PET is used for major textile fibers, which are known as polyester.Polyethylene naphthalate (PEN) is a new-generation polyester polymer of naphthalene-2, 6-dicarboxylate, and ethylene glycol. Although PEN is more expensive than PET, PEN exhibits higher dimensional stability, shrinkage resistance, and temperature stability, and better barrier properties than PET. Owing to its superior modulus of stiffness, PEN can be used to produce films of equivalent strength to PET but at a lower thickness and narrower width. Such films are advantageous for electrical applications,

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“…After the APP exposure, considerable increases in both advancing and receding wetting forces were observed. The advancing and receding contact angles were calculated from the advancing and receding wetting forces, respectively, using the Wilhelmy relation [37] and the effective perimeter of the film calculated from the wetting force at the npentane/air interface.…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

Surface modification of PET films by atmospheric pressure plasma exposure with three reactive gas sources

et al. 2012

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The surface modification of poly (ethylene terephthalate) (PET) film was carried out using an atmospheric pressure plasma (APP) jet device with three reactive gases: air, N 2 , and Ar. The water contact angles on the PET film were found to decrease considerably after the APP exposure. The changes in the advancing and receding contact angles of water on the APP-exposed PET film with aging time were examined by the wetting force measurements employing the Wilhelmy method. The hydrophobic recovery due to the rinsing with water as well as the aging in air was observed only for the advancing angle, which was probably caused by the dissolution of low molecular weight oxidized materials into water, the loss of volatile oxidized species to the atmosphere and the reorientation and the migration of polymer chains. The wettability and the surface free energy of the APP-exposed PET film after diminishing hydrophobic recovery was sufficiently large compared with the untreated film. X-ray photoelectron spectroscopy confirmed that the PET film surface was oxidized due to the APP exposure. When N 2 gas was used for the APP exposure, the surface nitrogen concentration was found to increase with decreasing D. The surface oxygen concentration on the APP-exposed PET film was reduced by rinsing with water, in accordance with the hydrophobic recovery behavior. From atomic force microscopy, surface topographical change due to the APP exposure was observed. The changes in the PET surface properties due to the APP exposure as mentioned above were remarkable for using N 2 gas.

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Estimation of surface free energies and hamaker constants for fibrous solids by wetting force measurements

Cited by 41 publications

References 16 publications

Wetting and Wicking in Fibrous Materials

Wetting and Wicking in Fibrous Materials

Surface hydrophilization of two polyester films by atmospheric-pressure plasma and ultraviolet excimer light exposures

Surface modification of PET films by atmospheric pressure plasma exposure with three reactive gas sources

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