Preparation and characterization of modified castor oil via photo‐click chemistry for UV‐curable waterborne polyurethane with enhanced water resistance and low conductive percolation threshold

A castor oil (CO) was modified via thiol‐ene click chemistry reaction between CO and 3‐mercaptopropyl trimethoxysilane, with the conversion of CC bonds of CO over 99% based on 1HNMR spectra. The obtained modified castor oil (MCO) was used as a biobased polyol to prepare waterborne polyurethane (WPU...

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Bibliographic Details
Published in:Journal of applied polymer science 2021-03, Vol.138 (9), p.n/a
Main Authors: Dai, Mengwei, Song, Pan, Zhang, Yong
Format: Article
Language:English
Subjects:
Antistatics
anti‐static
Carbon black
Carbon monoxide
Castor oil
Chemical synthesis
Coatings
Conductivity
Dispersions
Fillers
Hydrophobicity
Materials science
Percolation
photo‐click chemistry
Polymers
Polyurethane resins
Storage stability
Ultraviolet radiation
Water absorption
Water resistance
waterborne polyurethane
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Summary:A castor oil (CO) was modified via thiol‐ene click chemistry reaction between CO and 3‐mercaptopropyl trimethoxysilane, with the conversion of CC bonds of CO over 99% based on 1HNMR spectra. The obtained modified castor oil (MCO) was used as a biobased polyol to prepare waterborne polyurethane (WPU) dispersions. The modification of CO exhibited a great effect on the properties of WPU dispersions and coatings, and an obvious change is the improvement of the water resistance of WPU coatings. WPU dispersions with MCO had good storage stability. A WPU coating with 7% MCO had high surface hydrophobicity, and its water absorption was as low as 3.2%. Conductive carbon black filled WPU coatings with MCO were cured by efficient UV radiation, and their conductive percolation threshold could decrease to 0.76%, which could be attributed to the well filler dispersion and strong filler‐polymer interaction. The WPU dispersions are ecofriendly, and can be used to produce biobased WPU coatings with a great application potential in antistatic coating fields. Castor oil was modified via thiol‐ene click chemistry reaction. The modified castor oil was used as a bio‐based polyol to prepare waterborne polyurethane/carbon black coatings. A waterborne polyurethane coating with good water resistance and low conductive percolation threshold was obtained which has a great application potential in antistatic coating fields.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.49913