Mechanical and thermal properties of UV cured mixtures of linear and hyperbranched urethane acrylates

Džunuzović, Enis S.; Tasic, Srba; Bozic, Branislav; Džunuzović, Jasna V.; Dunjic, Branko; Jeremić, K.

doi:10.1016/j.porgcoat.2011.12.004

Cited by 32 publications

(17 citation statements)

References 35 publications

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“…The stress ()strain () curves of the UV cured samples were taken. Initial elastic modulus E = lim(d/d)| →0 , characterizes the resistance of the initial structure of the polymer at low unit strain values, when structure transformations nearly have not yet occurred [4]. There is a significant drop of E values with addition of various additives (Table 3).…”

Section: Resultsmentioning

confidence: 99%

“…Their properties are influenced by their functionality, the type of isocyanate, and the type and molecular weight of polyol used in the synthesis. The higher functionality gives greater reactivity and harder cured films with good scratch and chemical resistance, but at the same time causes increase of resin viscosity [4]. The monomer is used to control formulation viscosity (reactive diluent) but it affects both the cure speed and the extent of polymerization, and the properties of the cured film.…”

Section: Introduction mentioning

confidence: 99%

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Effect of Additives on UV-activated Urethane Acrylate Polymerization Composite Coatings

Grigale-Soročina¹,

Kalniņš²,

Simanovska³

et al. 2016

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An increased demand for new and improved coating systems, for environmental & health & safety and performance reasons, have appeared during the recent decades. Currently, there is new interest in preparation of thin UV curable urethane acrylate (UA) composite coatings with short-term properties. Cellulose based additives: nitrocellulose, cellulose acetate butyrate, sucrose benzoate and silica were evaluated to determine their influence on unreacted composite characteristics (viscosity, pigment suspension stability) and characteristics of cured film (ultimate tensile strength, elongation at break, surface gloss, surface scratch resistance and film adhesion loss time). The most suitable additive content was found to provide required viscosity. All additives increase surface scratch resistance, but cellulose based additives increase surface gloss values and decrease the time of adhesion loss. Silica has great effect on the interaction between linear and hyperbranched urethane acrylates, which has crucial influence on the stability of uncured pigmented mixture samples.

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Section: Resultsmentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

Effect of Additives on UV-activated Urethane Acrylate Polymerization Composite Coatings

Grigale-Soročina¹,

Kalniņš²,

Simanovska³

et al. 2016

View full text Add to dashboard Cite

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“…UV curing systems basically consist of oligomers, photoinitiators and low pressure monomers, which are used as reactive diluents to adjust the viscosity of the curing systems [12,13], as well as to introduce certain properties to the cured films, for instance, improving the chemical resistance, hardness, flexibility, durability and adhesion to the substrates [14]. The UV radiation curing technique has been applied in different curable acrylate system applications, such as biomedical applications and dental uses [15], polymer electrolytes for lithium batteries [16,17], polymer films for electronic circuit protection [18], ion-exchange membranes [19], and extensively in coating applications and adhesives [20,21,22], and showed excellent results with high performance cured materials.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Radiation Curable Palm Oil–Based Epoxy Acrylate: NMR and FTIR Spectroscopic Investigations

et al. 2015

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Over the past few decades, there has been an increasing demand for bio-based polymers and resins in industrial applications, due to their potential lower cost and environmental impact compared with petroleum-based counterparts. The present research concerns the synthesis of epoxidized palm oil acrylate (EPOLA) from an epoxidized palm oil product (EPOP) as environmentally friendly material. EPOP was acrylated by acrylic acid via a ring opening reaction. The kinetics of the acrylation reaction were monitored throughout the reaction course and the acid value of the reaction mixture reached 10 mg KOH/g after 16 h, indicating the consumption of the acrylic acid. The obtained epoxy acrylate was investigated intensively by means of FTIR and NMR spectroscopy, and the OPEN ACCESSMolecules 2015, 20 14192 results revealed that the ring opening reaction was completed successfully with an acrylation yield about 82%. The UV free radical polymerization of EPOLA was carried out using two types of photoinitiators. The radiation curing behavior was determined by following the conversion of the acrylate groups. The cross-linking density and the hardness of the cured EPOLA films were measured to evaluate the effect of the photoinitiator on the solid film characteristics, besides, the thermal and mechanical properties were also evaluated.

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“…The coating of 200 µm was cured under UV lamp (KP800LED, luminous intensity 130 mw, λ = 405 nm) (YI Liang Electron Technology Co, China) for 30 s. The curing time of photopolymers is dependent upon the dose intensity and wavelength of the UV light, which is found before. Initiation of polymerization requires precise matching of the photoiniciator and the UV light source [15]. To avoid oxygen inhibition activity on the coating surface, it was coated with transparent PE film with thickness 50 µ.…”

Section: Coating Formationmentioning

confidence: 99%

Additives in UV-activated urethane acrylate polymerization composite coatings

Grigale-Soročina¹,

Kalniņš²,

Simanovska³

et al. 2015

Proc. Estonian Acad. Sci.

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Thin UV curable coating systems is an important research field from the industrial perspective due to the improved environmental profile and wide varieties of characteristics. When used for short-term applications as coatings on natural nail for esthetical and medical reasons, the system may be manipulated to attain various properties, either desired or required by the manufacturer e.g. ensuring both excellent long-term properties (deformability, toughness, and good adhesion) and short-term properties (ability to be destroyed quickly after use). Performance of thin UV curable urethane acrylate composite coatings was investigated depending on the content of the additive. Nitrocellulose (NC), cellulose acetate butyrate (CAB), sucrose benzoate (SB), and silica were evaluated to determine their influence on unreacted composite characteristics (viscosity, suspension pigment stability) and reacted film characteristics (ultimate strength, elongation at break, surface gloss, surface micro hardness, and film adhesion loss). According to the tests performed all additives increase the modulus of elasticity. CAB and NC increase the elongation at break values, and strongly increase the uncured gel viscosity, what makes it inconvenient for application.

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Mechanical and thermal properties of UV cured mixtures of linear and hyperbranched urethane acrylates

Cited by 32 publications

References 35 publications

Effect of Additives on UV-activated Urethane Acrylate Polymerization Composite Coatings

Effect of Additives on UV-activated Urethane Acrylate Polymerization Composite Coatings

Synthesis of Radiation Curable Palm Oil–Based Epoxy Acrylate: NMR and FTIR Spectroscopic Investigations

Additives in UV-activated urethane acrylate polymerization composite coatings

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