Treatment of EVA with corona discharge to improve its adhesion to polychloroprene adhesive

Martínez‐García, Asunción; Sánchez-Reche, Ana; Gisbert-Soler, Santiago; Cepeda-Jiménez, C.M.; Torregrosa-Maciá, Rosa; Martı́n-Martı́nez, José Miguel

doi:10.1163/15685610360472439

Cited by 30 publications

(17 citation statements)

References 6 publications

(5 reference statements)

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“…A schematic of the electrode arrangement of the corona discharge unit used in this study is given in Fig. 1 [13]. The distance between the upper electrode and the sample was adjusted to 1 mm.…”

Section: Corona Discharge Equipmentmentioning

confidence: 99%

“…The discharge power was set to 93 W. 150-mm-long EVA samples were passed under the electrode at two different speeds of the counterpart electrode (0.36 and 11.3 m/min). These conditions provided values of the corona energy of 10.3 and 0.3 J/cm 2 , respectively [13].…”

Section: Corona Discharge Equipmentmentioning

confidence: 99%

“…Corona discharge treatment has been used previously [9 -12] to effectively promote the adhesion of EVA films to different materials in the packaging industry. In previous studies [8,13] we have shown that the surface modification of thicker EVA materials (about 2 mm) with corona discharge provided good adhesion properties, and the influence of different experimental variables in the corona discharge treatment were studied.…”

Section: Introductionmentioning

confidence: 99%

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Corona discharge treatment of EVAs with different vinyl acetate contents

Martínez‐García¹,

Sánchez-Reche²,

Gisbert-Soler³

et al. 2007

Journal of Adhesion Science and Technology

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Four ethylene vinyl acetate (EVA) co-polymers with different vinyl acetate (VA) contents (9-20 wt%) were treated with corona discharge to improve their adhesion to polychloroprene (PCP) adhesive. The thermal properties of the EVAs decreased as their VA content increased, caused by a decrease in crystallinity. The elastic and viscous moduli of the EVAs decreased and the temperature and modulus at the cross-over between these moduli decreased with increasing VA content. Contact-angle measurements (water), infrared spectroscopy (ATR-IR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) were used to analyse the surface modifications produced in the corona-discharge-treated EVAs. The corona discharge treatment produced improved wettability and created roughness and oxygen moieties on the EVA surfaces. The higher the VA content and the higher the corona energy, the more significant modifications were produced on the EVA surface. The VA content also affected the T-peel strength values of treated EVA/polychloroprene + isocyanate adhesive joints, as the values increased with increasing VA content. Mixed failure modes (interfacial + cohesive failure in the EVA) were obtained in the adhesive joints produced with corona discharge treated EVAs containing more than 9 wt% VA. The accelerated ageing of the joints did not affect the T-peel strength values, but the locus of failure in most cases became fully cohesive in the EVA, likely due to the higher extent of curing of the adhesive.

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Section: Corona Discharge Equipmentmentioning

confidence: 99%

Section: Corona Discharge Equipmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corona discharge treatment of EVAs with different vinyl acetate contents

Martínez‐García¹,

Sánchez-Reche²,

Gisbert-Soler³

et al. 2007

Journal of Adhesion Science and Technology

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“…Corona discharge and low-pressure plasmas have been also studied as effective surface treatments of EVA leading to oxidization on the surface, increasing its surface energy and creating surface roughness [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Improvement of adhesion and paint ability of EVA copolymers with different vinyl acetate contents by treatment with UV-ozone

Ruiz

Martı́n-Martı́nez

2015

International Journal of Adhesion and Adhesives

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The surface modifications produced by UV-ozone treatment of two ethylene-vinyl acetate (EVA) copolymers containing 12 and 20wt% vinyl acetate (EVA12 and EVA20 respectively) were studied. The treatment with UV-ozone improved the wettability of both EVAs due to the creation of new carbon-oxygen moieties on their surfaces. The extent of these modifications increased with increasing the length of the treatment and the modifications produced in EVA20 were produced for shorter lengths of treatment.The UV-ozone treatment also created roughness and heterogeneities on the EVA surfaces. Whereas roughness formation prevailed on the UV-ozone treated EVA12, important ablation was dominant on the treated EVA20. T-peel strength values in joints made with polychloroprene adhesive increased when the EVAs were treated with UVozone. Short length of UV-ozone treatment (1 min) produced higher T-peel strength in joints made with EVA20 whereas higher T-peel strength values in joints made with EVA12 were obtained after treatment for 5-7.5 min in which a cohesive failure into a weak boundary layer on the treated EVA surface was found. Furthermore, the adhesion of UV-ozone treated EVA20 to acrylic paint increased. Finally, the ageing resistance of the treated EVA/polychloroprene adhesive joints was good and the surface modifications on the UV-ozone treated EVAs lasted for 24 hours after treatment at least.

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“…Organic solvents are often used for cleaning surfaces but present various environmental problems, and the role of many traditionally used solvents is being reduced or eliminated by a combination of legislation and growing environmental awareness. Other surface treatment techniques such as flame, plasma, and corona discharge have also been developed [1][2][3][4][5][6][7][8][9]. Although these surface treatments are efficient and used widely in industry, they suffer from drawbacks such as high cost, hazardous operating conditions, byproducts, and the inability to treat complex geometric shapes.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Polycarbonate by Ultraviolet Radiation and Ozone

Bhurke

Askeland

Drzal

2007

The Journal of Adhesion

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The effect of ultraviolet (UV) radiation in the presence of ozone as a surface treatment for polycarbonate is examined in regards to changes in the wettability, adhesion, and surface mechanical properties. Standalone, 175-mm-thick films of a commercially available polycarbonate were exposed to UV radiation from sources of different power with various treatment times in the presence of supplemental ozone. Significant decreases in the water contact angle were observed after exposure to UV radiation in the presence of ozone. After several variations in the experimental setup, it was determined that the change in water contact angle is a function of the UV irradiance and the work of adhesion follows a master curve versus UV irradiance. Nanoindentation experiments revealed that the modulus of the top 500 nm of the surface is increased following UV exposure, attributable to surface cross-linking. Adhesion tests to the surface (conducted by a pneumatic adhesion tensile test instrument) showed little change as a function of UV exposure. Analysis of adhesion test failure surfaces with X-ray Photoelectron Spectroscopy (XPS) showed the locus of bond failure lay within the bulk polycarbonate and the measured bond strength is limited by the bulk properties of the polycarbonate and=or the creation of a weak boundary layer within the polymer.

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Treatment of EVA with corona discharge to improve its adhesion to polychloroprene adhesive

Cited by 30 publications

References 6 publications

Corona discharge treatment of EVAs with different vinyl acetate contents

Corona discharge treatment of EVAs with different vinyl acetate contents

Improvement of adhesion and paint ability of EVA copolymers with different vinyl acetate contents by treatment with UV-ozone

Surface Modification of Polycarbonate by Ultraviolet Radiation and Ozone

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