May. 24, 2018
Applications

Role of Phase Morphology on the Damage Initiated Self-healing Behavior of Ionomer Blends

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Self-healing materials based on polymer blends made of ionomers are interesting materials from both scientific and technological point of view. The self-healing behaviors of such materials were investigated by Mohammed Arifur Rahman et al. For the research reported in this article, the authors used a Leica EM UC7 ultramicrotome with an EM FC7 cryo chamber for preparation of the specimens for TEM analysis.

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M. A. Rahman, G. Spagnoli, A. M. Grande, L. Di Landro; Role of Phase Morphology on the Damage Initiated Self-healing Behavior of Ionomer Blends; Macromol. Mater. Eng. 2013, 298, 1350–1364

Abstract

The development of self-healing materials, based on polymer blends, is an important issue either from a scientific or a technological point of view. The application of such materials can be remarkably extended if healing effects can be maintained even in polymers that are modified in order to tune their physical and mechanical behavior. In this research the self-healing behavior of blends made of ionomers (sodium and zinc salts of poly(ethyelene-co-methacrylic acid)—EMNa and EMZn) with functionalized elastomers (epoxidized natural rubber with different epoxidation levels—ENR50 and ENR25, polyisoprene—PISP) of different compositions is investigated. The role of processing conditions, phase morphology, functionalization level, polymers compatibility over self-healing response are discussed. Rubber functionality and phase dispersion are recognized as crucial factors affecting the healing efficiency of blends. Results of ballistic tests, DSC thermal analysis, FTIR spectroscopy, optical and electron (SEM and TEM) microscopy observations, rheological and mechanical tests are presented as supporting evidences.

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