The Study of the Adhesive Activity and Modification Possibilities of Melamine-Urea-Formaldehyde (MUF), Urea-Formaldehyde (UF) Resins

Kajaks, Jānis; Kolbins, Arsenijs

doi:10.7250/msac.2014.006

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…The storage modulus of the neat UF sample decreased more with increasing temperature than that of the phosphor-doped samples. This is because the stiffness of polymer materials at high temperatures is limited to the amorphous region (Kajaks and Kolbins, 2014).…”

Section: Dynamic Mechanical Test Results Of Composites (Dma)mentioning

confidence: 99%

Preparation and characterization of strontium aluminate/urea-formaldehyde composite: a solution for oxidation-induced darkening problem

Koçak

Erbaş

2022

PRT

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Purpose This study aims to produce homogenously prepared polymer composites by adding two different strontium aluminate derivatives (Sr4Al14O25 and SrAl2O4) to urea-formaldehyde (UF) at different mass concentrations. In the context of this work those strontium-based derivatives were compared in terms of mechanical and luminescent characteristics. Additionally, sodium bicarbonate was integrated with the prepared composites to eliminate/minimize darkening problem, which might arise from the oxidation of Eu +2 to Eu2O3, on the surface of strontium aluminate/urea-formaldehyde composites. Design/methodology/approach In this study, strontium aluminate/UF composite materials were produced using a compression molding technique. Their mechanical, thermomechanical and luminescence properties were investigated via various characterization methods. Particle size analysis was used to characterize phosphor derivatives, whereas scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) was conducted for morphological examination. Findings The darkening problem was prevented by the introduction of sodium bicarbonate into the composite systems. Based on the characterization and test results, the only addition of strontium aluminate reduced the mechanical properties. However, it was seen that the introduction of sodium bicarbonate into the composites improved those properties positively. The appropriate amounts of strontium aluminate and sodium bicarbonate were determined by conducting an experimental optimization study. The optimum composition of the composite materials was obtained by introducing 2% phosphor and 3% NaHCO3. Originality/value The approach used in this study has provided a method to solve the darkening problem, which degrades the aesthetic appearance in industrial production.

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Section: Dynamic Mechanical Test Results Of Composites (Dma)mentioning

confidence: 99%