Cold-cured epoxy-silica hybrids: Effects of large variation in specimen thickness on the evolution of the Tg and related properties

• Published in: Polymer engineering and science Vol. 51; no. 2; pp. 358 - 368
• Main Authors: Lettieri, M., Lionetto, F., Frigione, M., Prezzi, L., Mascia, L.
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 01.02.2011; Wiley
• Subjects: Applied sciences; Composites; Exact sciences and technology; Forms of application and semi-finished materials; Polymer industry, paints, wood; Technology of polymers; Hybrid material; Epoxy resin; Organic siloxane; Curing (plastics); Experimental study; Property processing relationship; Silica; Glass transition temperature; Composite material; Thermal stability; Coupling agent; Thermal properties; Sol gel process; Adhesive; Room temperature
• ISSN: 0032-3888; 1548-2634
• DOI: 10.1002/pen.21817

Experimental organic–inorganic hybrid systems, based on silane functionalized difunctional and trifunctional epoxy resins and an alkoxysilane precursor mixture, containing small amounts of ammonium molybdate, are evaluated for potential use as adhesives cured at ambient temperatures. The precursor resin mixtures are found to exhibit a large increase in viscosity with a pseudoplastic behavior. Scanning electron microscopy (SEM) analysis shows the existence of siloxane domains with nanometric dimensions, except for the presence of microscopic molybdate particles. By monitoring the evolution of the glass transition temperature (Tg) during curing, varying the thickness of the specimens between 0.2 and 4.5 mm, it is found that the organic–inorganic hybrids display a significant increase in the final Tg over the parent unmodified epoxy resins, particularly in thin specimens and when ammonium molybdate is added. Small‐angle X‐ray scattering (SAXS) spectra show that the dimensions and typographic features of thick and thin specimens are similar, both containing an agglomeration of primary particles of 5–6 nm. POLYM. ENG. SCI., 2011. © 2010 Society of Plastics Engineers