A new hybrid waterborne polyurethane coating synthesized from natural rubber and rubber seed oil with grafted acrylate

[Display omitted] •A new synthetic route to develop hybrid WPU based on Natural Rubber and Rubber Seed Oil and grafted with acrylate.•The new hybrid WPU-g-P(BA/MMA) was stable for at least 6 months and the WPU film had good mechanical and thermal properties.•A hybrid WPU from renewable resources sup...

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Bibliographic Details
Published in:Progress in organic coatings 2020-04, Vol.141, p.105554, Article 105554
Main Authors: Sukhawipat, Nathapong, Raksanak, Wanida, Kalkornsurapranee, Ekwipoo, Saetung, Anuwat, Saetung, Nitinart
Format: Article
Language:English
Subjects:
Acrylate grafting
Coating
Hybrid waterborne polyurethane
Natural rubber
Rubber seed oil
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Summary:[Display omitted] •A new synthetic route to develop hybrid WPU based on Natural Rubber and Rubber Seed Oil and grafted with acrylate.•The new hybrid WPU-g-P(BA/MMA) was stable for at least 6 months and the WPU film had good mechanical and thermal properties.•A hybrid WPU from renewable resources supports the concept of eco-friendly material and could serve for coating applications. A new hybrid waterborne polyurethane (WPU) was successfully synthesized by emulsion polymerization from hydroxyl telechelic natural rubber (HTNR) and hydroxylated rubber seed oil (HRSO) at 50:50 M ratio as the polyol with grafted acrylate. The morphology of WPU was characterized by TEM, and its chemical structure was confirmed by FT-IR spectroscopy. The WPU had a good stability with total solids content of about 16 % and gave good film formation. The polarity and mechanical properties were improved by grafting BA/MMA co-monomer onto the WPU. The effects of the BA/MMA proportion were investigated. The new hybrid WPU-g-P(BA/MMA) demonstrated good dispersion and the particle size slightly increased with proportion of BA/MMA. The mechanical properties of the hybrid WPU-g-P(BA/MMA) films were studied from their stress-strain curves. The surface wetting and adhesive strength tended to increase with the proportion of BA/MMA in grafting. The results demonstrate a new way to utilize renewable resources in the form of a novel hybrid polyurethane, supporting the concept of eco-friendly materials in green coating applications.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2020.105554