Synthesis and Property of an Organosilicon Polyurethane Acrylate Prepolymer Containing Disulfide Bonds for Photopolymerization

Abstract

Photocurable organosilicon polyurethane acrylate materials combine the merits of both polyurethane and organosilicon and have become the most widely used class of photocurable resins due to the advantages of easy preparation and performance tunability, but they suffer from serious volume shrinkage and difficult degradation. In this article, an organosilicon polyurethane acrylate prepolymer (SSiPUA) containing disulfide bonds is designed and synthesized. The prepolymer exhibits good ability to photopolymerize and reduce the volume shrinkage. The final double bond conversion (DBC) of the system with SSiPUA reaches 92%, and the volume shrinkage is decreased to 4.9% that is much less than that (13.9%) without SSiPUA. Besides, with the increase of SSiPUA content within a certain range, the hydrophobicity, heat resistance, the tensile strength, and the elongation at break of the photocured films gradually increase. The water contact angle, initial decomposition temperature, the tensile strength, and the elongation at break reach up to 93°, 282 °C, 1.8 MPa, and 576.2%, respectively. However, the glass transition temperature is reduced with the increase of SSiPUA content owing to the excellent flexibility of polysiloxane chain segments. More significantly, the SSiPUA containing disulfide bonds endows the photocured film with good degradation properties.

Synthesis and Characterization of Sodium Lignosulfonate-Based Phosphorus-Containing Intermediates and Its Composite Si–P–C Silicone-Acrylic Emulsion Coating for Flame-Retardant Plywood

“…Silicone-acrylic emulsion (SAE) represents a versatile material amalgamating the high-temperature, weather, and chemical resistance attributes of silicone with the superior color retention, flexibility, and adhesion properties inherent to acrylic resin . Its versatility extends to various applications such as coatings, adhesives, stone paint, and exterior wall latex paint. − SAE is renowned for its robust adhesion, commendable mechanical properties, exceptional resistance to chemical solvents, and outstanding weather endurance .…”

Vat photopolymerization using catalytic chain transfer polymerization (CCTP) derived reactive oligomers to influence mechanical properties

“…Also, increased viscosity and polymerization-induced phase separation can be issues when a high concentration, or high molecular weight of prepolymer is applied. [4][5][6][7][8] One solution is to use reactive low molecular weight reactive prepolymers/oligomers to maintain a low viscosity and miscibility while leaching is mitigated as a result of copolymerization, in contrast to conventional non-reactive small molecular additives. 9,10 Catalytic chain transfer polymerization (CCTP) is a wellestablished polymerization technique to synthesise oligomers with a ω-vinyl group using certain low spin Co(II) complexes as chain transfer agents.…”

“…Also, increased viscosity and polymerization-induced phase separation can be issues when a high concentration, or high molecular weight of prepolymer is applied. 4–8 One solution is to use reactive low molecular weight reactive prepolymers/oligomers to maintain a low viscosity and miscibility while leaching is mitigated as a result of copolymerization, in contrast to conventional non-reactive small molecular additives. 9,10…”

The Post-Curing of Waterborne Polyurethane–Acrylate Composite Latex with the Dynamic Disulfide-Bearing Crosslinking Agent

“…Among various DCBs, the metathesis of aromatic disulfide (S-S) bonds under different kinds of stimuli has been extensively investigated [35][36][37]. In our previous work [38], we have demonstrated one post-curing strategy for the DCPN building of the PAC latex.…”