Journal of Applied Polymer Science, Vol.71, No.8, 1247-1256, 1999
Lonomeric polyblends of zinc salts of maleated EPDM rubber and poly(ethylene-co-acrylic acid). I. Effect of blend ratio
Ionomeric polyblends based on zinc salt of maleated EPDM rubber, abbreviated as Zn-mEPDM and zinc salt of poly(ethylene-co-acrylic acid), abbreviated as Zn-PEA in the compositions of 90/10, 80/20, 70/30, 60/40, and 50/50, parts by weight, behave as ionic thermoplastic elastomers. The ionomeric polyblends show synergism in tensile strength, tear strength, and hardness, which is believed to be due to the formation of intermolecular ionic crosslinks, facilitating compatibilization in the blends. The ionomeric polyblend exhibits higher physical properties than the corresponding nonionomeric polyblend. Dynamic mechanical thermal analyses show a high temperature transition due to the presence of a rigid phase arising out of the restricted mobility regions of the polymer chains adjacent to the ionic aggregates. The reprocess ability studies reveal that the ionomeric polyblend can be reprocessed.