Na) showed that different preparing procedures produced spectrally different ionomers. Ionomers prepared by grating showed carboxylate ν as peak in 1 580 ̄1 600 cm -1
but those prepared by melt grating showed ν as peak in 1 546 cm -1 and also appeared a new peak in 1 410 cm -1 In Na ionomer the peak in 1 466 cm -1 was split into two peaks
there was a new peak in 1 437 cm -1 They were perhaps caused by aggregation of ionomers and interaction of ions.