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Tuesday, 19 November 2019
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Raw materials & technologies, Technologies

Properties of water-borne hyperbranched alkyd–acrylic resins

Tuesday, 22 October 2019

The goal of a new work was to prepare and evaluate various properties of water-borne hyperbranched alkyd–acrylic resins (HAAR).

The researchers prepared and evaluated water-borne hyperbranched alkyd–acrylic resins (HAAR). Source: Wiski – stock.adobe.com.

The researchers prepared and evaluated water-borne hyperbranched alkyd–acrylic resins (HAAR). Source: Wiski – stock.adobe.com.

These materials were obtained by miniemulsion polymerisation from a hyperbranched alkyd resin (HAR), methyl methacrylate (MMA), butyl acrylate (BA), and acrylic acid (AA). The proportions of HAR:acrylic monomers were as follow: 50:50 (HAAR1), 40:60 (HAAR2), 30:70 (HAAR3), and 20:80 (HAAR4). The particle size increased with the content of HAR, but the colloidal stability, critical deformation, zeta potential, thermal stability, and hardness followed an opposite behaviour.

Better resistance against sodium hydroxide solution

The order of colloidal stability of the HAAR miniemulsions was HAAR4 > HAAR3 > HAAR2 > HAAR1. The particle morphology of the HAAR was mainly core–shell, but acrylic and alkyd particles were also observed. In addition, all HAAR initially exhibited a reduction in complex viscosity (η*) with the increase in angular frequency. The thermal stability of the HAR was lower than that of the HAAR. The HAAR showed better resistance against a 0.10 M sodium hydroxide (NaOH) solution than HAR.

The study is published in: Journal of Coatings Technology and Research  September 2019, Volume 16, Issue 5, pp 1223–1232.

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