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We carried out tensile impact test and very low speed tensile test on ethylene‐based Ionomers (E/15wt %MAA) to clarify the relation between impact toughness and high‐ordered structure. We also studied the changes in high‐ordered structure under deformation by observing Differential Scanning Calorimetory (DSC) and Small‐Angle X‐ray Scattering (SAXS) of fractured surface. Na Ionomers showed ductile fracture in both high speed tensile impact (3 m/s) and very low speed tensile (2 mm/min). The disappearance of secondary melting point (Ti) in Na Ionomers was due to the destruction of ordered structure surrounding the ionic aggregate. Similar behavior was observed in 60% (or less) neutralized Zn Ionomers. However, 80% neutralized Zn Ionomer showed brittle failure in high‐speed tensile impact, and Ti did not disappear. SAXS studies of Na and Zn Ionomers after fracture, show no change both after molding (no aging) and after aging. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 1712–1720, 2001

The influence of cooling conditions on the bending properties and Mode I interlaminar fracture toughness of commingled PET/GF and PA6/GF composites was investigated. The morphology and thermal properties of the composites were studied using scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The results show that cooling conditions had no major effect on bending properties, but the fracture toughness (GC) was affected; i.e., fracture toughness of gradual cooling was lower than rapid cooling. The bending properties are not significantly affected by crystallinity, but GC is strongly influenced by the level of crystallinity in the matrix resin.

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