Fabrication of High‐Performance Cationic UV Curable Cycloaliphatic Epoxy/Silicone Hybrid Coatings

Abstract

A series of cycloaliphatic epoxy acrylate prepolymer poly (METHB‐co‐MMA‐co‐BA) (MMB) and an epoxycyclohexyl‐modified polydimethylsiloxane (PDMS‐VCH) are prepared to fabricate hybrid coatings. The curing process, surface performance, mechanical properties, and thermal behavior are investigated by real‐time Fourier transform infrared (FT‐IR), contact angle measurements, tensile test, thermogravimetric analyzer (TGA), and differential scanning calorimeter (DSC). For the same photoinitiator (PI) concentration, both the epoxy value and the amount of PDMS‐VCH negatively affect the UV‐curing process. The contact angle of hybrid coatings increases by almost 12° with 4 wt% PDMS‐VCH's addition. The increasing ratio of soft acrylate segment can strengthen the toughness of materials markedly. Besides, thermal stability is enhanced with the increasing of epoxy value, while slight changes are found with the addition of PDMS‐VCH. Based on these properties, the hybrid coatings can be applied in various fields, including protection, decoration, and other displayed fields.

Effect of Varying Chain Length and Content of Poly(dimethylsiloxane) on Dynamic Dewetting Performance of NP-GLIDE Polyurethane Coatings

“…Although our earlier research − and research of others − have focused on the development of various NP-GLIDE formulations, a systematic study of factors affecting the dynamic dewetting properties of these coatings has not been reported. For example, only one PDMS sample with a number-average molecular weight of 5.0 kDa has been tested so far by us in all of the previously developed PDMS-based NP-GLIDE coatings, and the possibility of further improving the properties of the coatings by changing the molecular weight of the PDMS component remains unexplored.…”

Preparation of epoxy-based silicone prepolymers with applications in UV-curable coatings

“…The contact angles of water droplets placed on cured films of prepolymers A, B and C are listed in Table 2. It can be seen in Figure 8 that the water contact angle is greater than 100°, indicating that the cured film is hydrophobic (Zhou et al , 2017; Zhu et al , 2018; Seo and Han, 2011). With the decrease of ether group content, the polarity of dual curable epoxy-based silicone coatings decreases, and the coating surface energy after curing decreases.…”

Photoinduced ring-opening polymerizations

“…More recently, photoinduced CROP of these monomers has been reported with the aim at designing hybrid materials with peculiar properties. Particularly, several coatings based on these hybrids systems have been develop for a wide range of applications [370][371][372][373].…”