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The magnetic properties of polymers containing tetraphenylporphin-Cu(II) (TPP-Cu(II)) or tetraphenylporphin-Ag(II) (TPP-Ag(II)) in the side chains were studied by the magnetic susceptibility (XM) measurement (4-300 K) and ESR spectroscopy. The values of XM for the polymer containing TPP-Cu(II) were found to obey the Curie-Weiss law, and a magnetic moment showed the occurrence of a weak antiferromagnetic interaction between Cu(II) ions. The values of XM for the polymer containing TPP-Ag(II) did not obey any simple equation such as the Curie-Weiss law or Bleaney-Bowers equation and simulation of temperature dependence of XM showed the presence of strongly interacting sites. This strong interaction may possibly arise from a hyperexchange interaction through C=O groups situated among the Ag(II) ions. An ESR study also supported the presence of this interaction between the side groups in a polymer chain. KEY WORDS Metalloporphin Polymer I Magnetic Property I Magnetic Susceptibility I Electron Exchange I ESR I Antiferromagnetic Interaction 1

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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