Room temperature curing of acrylate-functionalized polyurethanes based on the solvent-free redox polymerization

[Display omitted] •Redox initiating system for free radical polymerization of acrylate-functionalized polyurethanes was developed.•The whole procedure was conducted in the absence of solvent, which is environmentally friendly.•Cured polymer films with high transmittance shown good mechanical propert...

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Bibliographic Details
Published in:Progress in organic coatings 2018-11, Vol.124, p.16-24
Main Authors: Wu, Bo, Chen, Xiaofeng, Liu, Zhimeng, Jiang, Liang, Yuan, Ye, Yan, Peiyao, Zhou, Changlin, Lei, Jingxin
Format: Article
Language:English
Subjects:
Acrylate-functionalized polyurethane
Addition polymerization
Adhesive strength
Aliphatic compounds
Crosslinking
Cumene
Cumene hydroperoxide
Differential scanning calorimetry
Fourier transforms
Free radical polymerization
Free radicals
Oxidation
Oxidizing agents
Polymer films
Polymerization
Polymerization kinetic
Polymers
Polyurethane
Polyurethane resins
Redox polymerization
Reducing agents
Room temperature
Solvent-free system
Tensile strength
Thermal stability
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Summary:[Display omitted] •Redox initiating system for free radical polymerization of acrylate-functionalized polyurethanes was developed.•The whole procedure was conducted in the absence of solvent, which is environmentally friendly.•Cured polymer films with high transmittance shown good mechanical properties and thermal stabilities.•Redox polymerization kinetic was studied by FTIR and DSC. In this work, we proposed an efficient redox initiating system (ROIS) for free radical polymerization of acrylate-functionalized polyurethanes (APUAs) at room temperature. In this ROIS, cumene hydroperoxide and aliphatic tetraethylenepentamine were used as the oxidizing agent and reducing agent, respectively. Fourier transform infrared spectroscopy results of APUAs and cured polymers show that this ROIS can enable both surface and inner curing of APUAs. The oxygen inhibition can be overcome by the reaction of tetraethylenepentamine with the hydroperoxide produced during the curing process in air atmosphere. The obtained polymer films show good transmittance, high crosslinking density (>86%), good thermal stability and suitable tensile strength (7.64 MPa), which can be applied in coating and adhesive industries. In addition, redox polymerization kinetic was studied by using differential scanning calorimetry.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2018.07.007