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Water ageing of urethane dimethacrylate networks

Article dans une revue avec comité de lecture
Author
POMES, Benjamin
459855 Université Paris Diderot - Paris 7 - UFR Odontologie [UPD7 Odontologie]
DERUE, Isabelle
LUCAS, Albert
NGUYEN, Jean-François
459855 Université Paris Diderot - Paris 7 - UFR Odontologie [UPD7 Odontologie]
ccRICHAUD, Emmanuel
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/13284
DOI
10.1016/j.polymdegradstab.2018.06.003
Date
2018
Journal
Polymer Degradation and Stability

Abstract

This work explores the process of water ageing of high-temperature high-pressure polymerized urethane dimethacrylate (UDMA) networks. UDMA samples polymerized under several pressures (0.1–300 MPa) and differing by the conversion degree of polymerization were aged in water at 37, 50 and 70 °C and followed by gravimetry. Diffusion was observed to obey Fick's law. The diffusion coefficient and water maximal uptake were observed to be almost independent of polymerization pressure, consistently with analysis of Dynamic Vapor Sorption data suggesting that external polymerization pressure has no effect on polymer affinity with water. This was ascribed to the fact that all materials have the same cohesive energy, as confirmed by ultrasonic measurements of elastic moduli. Polymerization pressure (used to improve conversion degree and mechanical properties) would thus have a minor influence on water ageing that is mainly triggered by polymer chemistry. When elevating the polymerization pressure, there is hence no compromise between the optimization of thermo-mechanical properties and the resistance to water ageing.

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