Characterization of ethylene homo- and copolymers

Summary For (norbornene ethylene) copolymers with a preferably alternating structure two methods for the determination of chemical composition were tested: the differential refractometry (DR) and the differential scanning calorimetry (DSC). It was found, that the refractive index increments measured by DR in 1,2,4-trichlorobenzene can be calculated by adding the refractive index increments of the homopolymers with regard to the composition of the copolymers. This was proved by comparing with results obtained by 1H-NMR-measurements. The temperatures of the glass transition determined by DSC yield a straight line correlation to the chemical composition. Errors of both methods due to the influence of molecular masses are negligible and of significance only in the range of low molecular masses.Part V: Polymer Bull. 15, 551 (1986)