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Thursday, 19 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Coatings binders: Nonionic monomer effects properties of hybrid emulsion

Thursday, 6 November 2014

A series of cationic acrylic/alkyd resin (CPAAR) hybrid emulsions was successfully prepared through surfactant-free emulsion polymerisation.

Researchers prepared cationic acrylic/alkyd resin (CPAAR) hybrid emulsions through surfactant-free emulsion polymerisation. Source: Drozdi/Fotolia

Researchers prepared cationic acrylic/alkyd resin (CPAAR) hybrid emulsions through surfactant-free emulsion polymerisation. Source: Drozdi/Fotolia

The researchers used methacryloxyethyltrimethyl ammonium chloride, methyl methacrylate, butyl acrylate and alkyd resin as reaction monomers. They simultaneously incorporated nonionic N-hydroxymethyl acrylamide (HAM) of different content into the CPAAR backbone. The structure of CPAAR copolymer was characterised by Fourier transform infared spectrometer, and then the effect of HAM content on properties of CPAAR emulsions was studied by particle size analyser, transmission electron microscopy and rheometer. In addition, thermal properties, water absorption and contact angle of CPAAR latex films were also investigated.

Water absorption kept almost invariable

The results showed that the CPAAR emulsions prepared with 4.9 wt % HAM displayed smallest average particle size of 92.2nm. As HAM content increased from 0 to 19.6wt %, the initial viscosity of the emulsions increased from 22.48 to 53mPa.s. At the same time, the emulsions transferred from Newtonian fluid to pseudoplastic fluid, and a transition from viscous liquid to elastic liquid was also detected. Meanwhile, the degradation temperature at 5% weight loss increased by 30.59°C. In addition, with increasing HAM content from 0 to 4.9 wt %, the water absorption and surface free energy of films increased by 4.42% and 5.02mJm−2, respectively. However, the water absorption and surface free energy kept almost invariable with further increase in HAM content.

The study is published in: Journal of Applied Polymer Science, Volume 132, Issue 5, February 5, 2015.

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