Effect of plasma pretreatment on adhesion and mechanical properties of UV-curable coatings on plastics

Gururaj, T.; Subasri, R.; Raju, K. R. C. Soma; Padmanabham, G.

doi:10.1016/j.apsusc.2010.12.060

Cited by 38 publications

(28 citation statements)

References 21 publications

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“…Irradiations were performed at 25 C under "dry" conditions (i.e., room relative humidity). After UV irradiation for different intervals of time (0,8,20,30,50,80, and 120 h), adhesion, contact angle, UV-vis, and nanomechanical properties were used to evaluate the ageing behavior of AS coatings and PCs respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Antiscratch organic coatings are the predominant topcoat used on PCs to enhance their mechanical properties and antiscratch performance. [4][5][6] Protective coatings used in the aeronautical industry, to some extent, can deteriorate because of poor flying environments, which include ultraviolet (UV) irradiation, hygrothermal effects, and salt spray. The evaluation of ageing properties to explain the failure mechanism for the coating system is critical to its safe usage.…”

Section: Introductionmentioning

confidence: 99%

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Adhesion failure of antiscratch coatings on polycarbonate under UV irradiation

Zhang

Zhong

2014

J of Applied Polymer Sci

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The adhesion failure of antiscratch (AS) coatings on unmodified and plasma-modified polycarbonate (PC) substrate was studied using both chemical and physical methods while considering the surface and interface changes between coatings and PC under ultraviolet (UV) irradiation. The differences in the wettability and surface elemental compositions of the PC surface (PCs) and AS coatings after UV ageing were evaluated by contact angle and Fourier transform infrared (FTIR) measurements. The nanoindentation technique was employed for the quantitative assessment of the changes in the nanomechanical properties of both PCs and AS coatings under UV irradiation. The adhesion of coating on plasma-modified PC was found to be significantly better than that of unmodified substrates. The hydrophilicity and polarity of PCs covered by AS coatings were significantly increased because of the photodegradation of PCs, whereas silicon coatings remained invariant. Nanoindentation tests revealed an obvious enhancement in stiffness of the coating and exposed PC after ageing. Based on these experiments, we proposed that adhesion failure under UV irradiation may be caused by two reasons: first, the photodegradation that occurred at the PCs covered by AS coatings; and second, the stress induced by the changes in stiffness of both AS and PCs under UV ageing.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adhesion failure of antiscratch coatings on polycarbonate under UV irradiation

Zhang

Zhong

2014

J of Applied Polymer Sci

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“…In terms of comparison with literature, little information is available for contact angles obtained on partially cured polymers. For contact angle measurements made on UV cured films [51,52], no information was provided on the final cure stage of those films, following which the authors assume that they are fully cured.…”

Section: Contact Angle and Printabilitymentioning

confidence: 99%

Surface modification of an ambient UV-cured dielectric to realise electrically conducting traces

Lim

Goh

Liu

et al. 2015

Surface and Coatings Technology

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Citation: LIM, Y.Y. ... et al, 2015. Surface modification of an ambient UVcured dielectric to realise electrically conducting traces. Surface and Coatings Technology, 266, Additional Information:• This article was accepted for publication in the journal, Surface and Coat- AbstractThere has been much interest in the printing of silver inks onto flexible substrates, for which intermediate dielectric layers are often required to achieve suitable wettability. This work seeks to realize continuous silver traces overprinted onto UV-curable dielectrics through surface modification techniques (thermal and UV-ozone post treatments), when the UV light source used for the curing is non-optimal. Two UV curable dielectric materials were deposited and the effects of curing time and curing atmosphere on the inkjet printability of a commercially available silver ink were investigated. Good wettability of the silver ink was obtained following ozone treatment of the dielectric layers, where the treatment required was found to be a function of the dielectric formulation and the curing atmosphere. Water droplet contact angle measurements were used to analyse the resulting changes in the surface conditions of the dielectric layers. The results provided an indication, but were not sufficient for predicting whether silver traces with measurable resistance could be subsequently obtained. Instead, measurable silver trace resistances were found to be influenced by the occurrence of cracks in the trace and possibly the degree of cross-linking present in the dielectric. Following these results, the authors demonstrate that electrically conductive traces can be achieved on ambient cured samples, which yields a more flexible solution compared to inert cured samples.

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“…Therefore the adhesion increases when the interfacial energy decreased. Interfacial energy between substrates (1) and hybrid film (2) in the composite has been determined with:…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

“…Indeed a main limitation in using coated plastics was the weak interfacial adhesion of the inorganic thin film on the polymeric substrate resulting in cracking upon drying process [1]. In order to prevent this drawback,surface activation methods such as plasma have been developed, to activate the surface and improve the wettability by bonding between the coating and the substrate [2]. Moreover, glycidoxypropyltrimethoxysilane (GOTMS) was used to enhance the properties ofthe deposited film [3].…”

Section: Introductionmentioning

confidence: 99%

Hydrophilization by coating of silylated polyoxazoline using sol–gel process

Alexis

Charnay

Lapinte

et al. 2013

Progress in Organic Coatings

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Hybrid films prepared from TEOS and polyoxazoline cross-linkers(Si-POx-Si) were coated on different substrates in order to modify their surface properties. The film cohesion and adhesion on substrates were expected through the hydrogen bonding of the polyoxazoline crosslinked network. Low molecular-weight α,-unsaturated polyoxazolines (DA-PMOx)s were synthesized by a one step cationic ring-opening polymerization (CROP) of 2-methyl-2-oxazoline (MOx) with a good control over the molecular weight. Based on double thiol-ene coupling (d-TEC), a postfunctionalization of end chains DA-PMOx gave in good yield polyoxazoline cross-linker (SiPOx-Si). Glass and various polymer substrates (PP, PEI, POM...) were spin coated by the organic-inorganic hybrid films through sol-gel process. AFM, SEM, visible reflectance spectroscopy and contact angle experiments allowed the full characterization of targeted surfaces and demonstrated the efficiency of the polyoxazoline coating.3

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Effect of plasma pretreatment on adhesion and mechanical properties of UV-curable coatings on plastics

Cited by 38 publications

References 21 publications

Adhesion failure of antiscratch coatings on polycarbonate under UV irradiation

Adhesion failure of antiscratch coatings on polycarbonate under UV irradiation

Surface modification of an ambient UV-cured dielectric to realise electrically conducting traces

Hydrophilization by coating of silylated polyoxazoline using sol–gel process

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