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Correlation of morphological parameters and mechanical performance of polyamide‐612/poly (ethylene–octene) elastomer blends
Author(s) -
Kumar Sunil,
Satapathy Bhabani K.,
Maiti Saurindra N.
Publication year - 2013
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.3113
Subject(s) - materials science , composite material , ultimate tensile strength , elastomer , crystallinity , toughness , dynamic mechanical analysis , octene , izod impact strength test , maleic anhydride , scanning electron microscope , polyamide , crystallization , coalescence (physics) , polymer , copolymer , chemical engineering , physics , astrobiology , engineering
Blends of polyamide‐612 (PA‐612) and maleic anhydride grafted poly (ethylene–octene) elastomer (POE‐g‐MA) as an impact modifier have been prepared in the composition range of 0–35 wt. % of POE‐g‐MA and subsequently investigated for their structural, thermal, mechanical, dynamic mechanical properties and morphological attributes. X‐ray diffraction studies revealed a decrease in crystallinity whereas the thermal properties such as onset to degradation temperature and crystallization temperature remained broadly unaffected. Nearly three‐fold increase in the impact strength is registered accompanied by substantial increase in tensile failure strain, though tensile modulus (E) and tensile yield strength ( σ y ) decreased with increase in impact modifier content. Dynamic mechanical analysis exhibited a singularity response in the loss factor in the temperature range of ~10°C–50°C. Micromechanical aspects were analyzed using conventional theoretical models for low strain mechanical response (E) such as rule of mixtures and foam model and for high strain mechanical response ( σ y ) such as Nikolais–Narkis model and porosity model. Impact toughness and strain‐at‐break of the investigated composition were successfully correlated to the domain size (D n ) of the dispersed phase and their inter‐particle distances (τ). Scanning electron microscopy showed the coalescence of domains of the dispersed phase at higher POE content and thus reiterates the crucial role of inter‐particle distance in controlling the toughening mechanism of POE blended PA‐612. Copyright © 2013 John Wiley & Sons, Ltd.