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Improvements in mechanical properties at low temperatures are desirable for epoxy resins such as diglycidyl ether of bisphenol A (DGEBA) that are often used in cryogenic engineering applications. In this study, a hydroxyl functionalized hyperbranched polymer (H30) is employed to improve the mechanical properties of a DGEBA epoxy resin at liquid nitrogen temperature (77K). The results show that the...
Epoxy-based nanocomposites were prepared with natural nanotubes from halloysite, a clay mineral with the empirical formula Al 2 Si 2 O 5 (OH) 4 . The morphology of the nanotubes was examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) and was found geometrically similar to multi-walled carbon nanotubes. The thermal and mechanical...
Measurements of temperature-dependant elastic moduli of two cured epoxy systems and two silica–epoxy nanocomposites were conducted using dynamic mechanical analysis (DMA) methods with different loading fixtures. Comparisons of the results were made with those obtained from tests with different loading modes and from mechanical testing results under various temperatures. Discrepancies were found between...
An investigation was conducted to characterize fracture behaviours of nano-silica modified epoxies at low and elevated temperatures. A nano-silica dispersed epoxy (Nanopox XP 22/0516, Hanse-Chemie, Germany) with 40 wt% silica nano-particles was used as modifier to toughen an epoxy resin, Araldite F (Bisphenol A based, Ciba-Geigy). Fracture toughness and other mechanical properties were measured using...
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