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Optimization of Waterborne Poly(Urethane-Acrylate) Nanoemulsions Based on Cationic Polymerizable Macrosurfactants with Different Hydrophobic Side Chain Length

1
Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi’an 710021, China
2
Shaanxi Institute of Technology, College of Chemical Engineering, Xi’an 710300, China
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(12), 1922; https://doi.org/10.3390/polym11121922
Received: 28 September 2019 / Revised: 5 November 2019 / Accepted: 7 November 2019 / Published: 21 November 2019
In situ surfactant-free emulsion polymerization can help avoid the utilization of harmful co-solvents and surfactants in the preparation of waterborne poly(urethane-acrylate) (WPUA) nanoemulsion, but the solid content is extremely limited, which will affect the drying rate and film-forming properties. The utilization of polymerizable macrosurfactants can overcome the above problems. However, the research on cationic polymerizable macrosurfactants is extremely scarce. In this work, cationic dimethylaminoethyl methacrylate-b-alkyl methacrylates block copolymers (PDM-b-PRMA) with terminal double bonds and different hydrophobic side chain (HSC) lengths were fabricated via catalytic chain transfer polymerization (CCTP). HSC length of PDM-b-PRMA played an important role in the phase inversion, morphology, rheological behavior of WPUA nanoemulsions, as well as the comprehensive performance of WPUA/PDM-b-PRMA films. Polymerizable PDM-b-PBMA macrosurfactant had smaller molecular weight, lower surface tension and colloidal size than the random copolymer (PDM-co-PBMA) by traditional free radical polymerization. It was easy for PDM-b-PRMA to orientedly assemble at the oil/water interface and provide better emulsifying ability when the carbon number of HSC was four. Compared with WPUA/PDM-co-PBMA, WPUA/PDM-b-PBMA had a smaller particle size, stability and better film-forming properties. This work elucidated the mechanisms of HSC length in the fabrication of cationic PDM-b-PRMA and provides a novel strategy to prepare cationic WPUA of high performance.
Keywords: cationic polymerizable macrosurfactant; waterborne poly(urethane-acrylate); hydrophobic side chain; catalytic chain transfer; mechanism cationic polymerizable macrosurfactant; waterborne poly(urethane-acrylate); hydrophobic side chain; catalytic chain transfer; mechanism
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MDPI and ACS Style

Fei, G.; Geng, H.; Wang, H.; Liu, X.; Liao, Y.; Shao, Y.; Wang, M. Optimization of Waterborne Poly(Urethane-Acrylate) Nanoemulsions Based on Cationic Polymerizable Macrosurfactants with Different Hydrophobic Side Chain Length. Polymers 2019, 11, 1922.

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