Abstract
The conventional polyurethane (PU) coatings have poor heat resistance, which will undergo severe pyrolysis when the temperature exceeds 200 °C. To overcome the shortcoming of conventional PU coatings, an ultraviolet (UV)-cured solvent-free hyperbranched polycarbosilane modified PU coatings was prepared by sulfhydryl-terminated polyurethane and allyl-terminated hyperbranched polycarbosilane. The initial decomposition temperature (Td5%) of the UV-cured coating ranges from 258 to 268 °C, which is obviously higher than those of the conventional PU coatings reported. The coating shows fairly low water absorption in the range of 0.6–1.36 wt% and exhibits grade 1, grade 2 and grade 3 adhesion to glass, tin plate and aluminum sheet, respectively.
Highlights
Ultraviolet (UV)-cured coatings have drawn much attention because of their advantages such as environment friendliness, rapid curing rates, and optimized energy consumption [1,2,3,4,5,6]
The conventional PU coatings, namely PUs synthesized via diisocyanates and polyols with various chain length, have poor heat resistance, which will undergo severe pyrolysis when the temperature exceeds 200 ◦ C [9,10,11]
The coating partially peels off the tin plate in the test area and the adhesion of the coating on the aluminum sheet is worst because a large area of coating falls off in the test area. This denotes that the UV-cured materials obtained can be used as coating for substrates such as glass and tin plate, but not suitable for aluminum
Summary
Ultraviolet (UV)-cured coatings have drawn much attention because of their advantages such as environment friendliness, rapid curing rates, and optimized energy consumption [1,2,3,4,5,6]. The conventional PU coatings, namely PUs synthesized via diisocyanates and polyols with various chain length, have poor heat resistance, which will undergo severe pyrolysis when the temperature exceeds 200 ◦ C [9,10,11]. The poor mechanical performance and chemical resistance of conventional PU coatings attributed to the low density and inadequate photosensitive groups of the PU oligomers limit the application of PU coatings [12]. The crosslinkable carbosilane polymers exhibit excellent heat-resistance [14,15]. Inspired by these works, a polyurethane coating might be modified with polycarbosilanes to improve heat resistance
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