MISCIBILITY OF FUNCTIONALIZED POLYOLEFINS WITH POLYAMIDE-6 AS DETECTED BY SOLID-STATE NMR

Solid-state NMR was used to investigate the miscibility of LLDPE/polya mide-6 blends. Two different blends B1 and B2, obtained with LLDPE onl y and with LLDPE functionalized with diethyl succinate, respectively, as well as their individual components, were characterized by means of C-13 selective techniques. Measurement of H-1 spin-lattice relaxation times in both laboratory and rotating frames allowed the miscibility at a molecular level to be investigated for both blends: in BI the dom ains of the different components are on average larger than 100-200 An gstrom, whereas in B2, where two different fractions could be separate d on the basis of their solubility in heptane, the average linear dime nsions of the insoluble fraction are between 20 and 200 Angstrom.