Disulfide‐Functionalized Polyurethanes Serve as UV‐Curable One‐Component Adhesives

Journal of Applied Polymer Science, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 22, 2024

ABSTRACT One‐component polyurethane (PU) adhesives typically cure through the reaction between –NCO functional groups and moisture in ambient air, requiring moisture‐free storage. In this study, we present a novel one‐component adhesive that cures via UV irradiation is resistant to during The polyurethanes were synthesized by polymerizing diisocyanate, polytetramethylene ether glycol, bis(hydroxymethyl)‐1,2‐dithiolane. incorporated dithiolane moieties, inherently photo‐responsive, enable efficient cross‐linking under light without need for external photo‐initiators or absorbers. Rheological analysis of both uncured cured confirmed their suitability applications. 4,4′‐methylene bis(cyclohexyl isocyanate)‐derived exhibited highest tensile strength, with stress at break 3.49 ± 0.24 MPa an elongation 74.38% 7.47%. This served as achieved robust bonding performance on various transparent plastic sheets, strength up 5.88 0.49 polyvinyl chloride (PVC) substrate.

Язык: Английский

Ambient Solvent Evaporation‐Triggered Irreversible Covalent Crosslinking for Robust Adhesion in Extreme Conditions

Small, Год журнала: 2025, Номер unknown

Опубликована: Май 2, 2025

Abstract Covalently crosslinked polymers, renowned for their stability and superior performance, play a pivotal role in materials science technology. Yet, conventional crosslinking, reliant on external agents energy‐intensive processes, prompts growing demand sustainable energy‐efficient alternatives. Here, it is demonstrated that irreversible covalent crosslinking can be achieved simply through ambient solvent evaporation molecularly engineered polydimethylsiloxane system functionalized with dithiolane moieties. This process, validated using reduced density gradient analysis, forms robust, polymer network (CTP), fundamentally distinct from dynamic disulfide‐based reversible systems or physically bonded polymers typically formed via evaporation. The resultant CTP demonstrates strong adhesion to various substrates, as analyzed quantitatively Density Functional Theory simulations. Furthermore, the displays excellent waterproofing, high optical transparency, notable resistance extreme temperatures highly corrosive solvents. performance of derives its robust network, enriched disulfide peptide bonds liquid‐like PDMS segments. Moreover, CTP's preparation straightforward, sustainable, cost‐effective. These advancements position promising development adhesive technology, suitable wide range applications requiring mechanical robustness, chemothermal resilience, clarity, particularly scenarios sensitive thermal radiation exposure.

Язык: Английский

Solution-state self-assembly of novel poly(carbamoyl methacrylate)s synthesized via combining Passerini three-component reactions and free radical polymerizations

European Polymer Journal, Год журнала: 2024, Номер 218, С. 113361 - 113361

Опубликована: Авг. 2, 2024

Язык: Английский