ion selective electrodeionic bondionic strengthionization potentialionizing radiationionomeriridescentiris diaphragmiron oreirradiationirreversibleisoisochronous curveisoconversionalisolatorisometric curvesisomorphic substitutionisotacticisotacticity indexisothermisothermal aging testisothermal compressibilityisothermal curveisothermal processisotropicisotropic materialisotropyiterative procedureizod impact strength