Journal
POLYMERS
Volume 11, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/polym11121922
Keywords
cationic polymerizable macrosurfactant; waterborne poly(urethane-acrylate); hydrophobic side chain; catalytic chain transfer; mechanism
Categories
Funding
- National Natural Science Foundation of China [51373091, 21978164]
- Industrialization Project of Shaanxi Education Department [19JC010]
- Key Research and Development Program of Shaanxi Province [2018KW-007, 2017GY154]
- Innovation Supporting Plan of Shaanxi Province-Innovation Research Team [2018TD-015]
- Scientific Research Foundation (SRF) for Returned Overseas Chinese scholars (ROCS), State Education Ministry (SEM) [[2012]1707]
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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.
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