Calculation of Grafting and Property Characterization in Polyurethane-Acrylic Hybrid Materials Prepared by Emulsion Process

✍ Scribed by Xubao Jiang; Xiang-Zheng Kong; Xiaoli Zhu; Zhao Zhang; Zhi-Guo Zhang

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 267 KB
• Volume: 211
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.201000222

✦ Synopsis

Abstract

Polyurethane‐acrylics (PU‐AC) hybrid latexes were prepared using isophorone diisocyanate and polypropylene oxides as main monomers for the PU component, butyl acrylate and methyl methacrylate as AC monomers, and hydroxyethyl acrylate (HEA) as coupling agent to build up chemical bonds between PU prepolymers and AC polymers (PAC). A simple method to determine the PU grafted to PAC chains at one end and at both ends was established, which showed that PU grafted to PAC at both terminals was obviously increasing with HEA, and soon became predominant over that grafted by one end when the HEA/NCO molar ratio reached 0.67. With HEA/NCO < 1, PU grafting, particle size of the hybrid latex and film tensile strength increased with the HEA amount; while with HEA/NCO > 1, these properties remained relatively stable.
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