Etude de la structure ramifiée du polyéthylène basse densité par viscosité et diffusion de la lumière de fractions issues de la chromatographie d'exclusion gpc

Abstract

Abstract Fractions of high density polyethylene (PEhd) and low density polyethylene (PEld) obtained from gel permeation chromatography were studied by viscometry and light scattering. The variations of the intrinsic viscosity [η], the molecular weight M̄ w , and the radius of gyration R g for PEhd and PEld were compared with one another and the relationships [η] vs M and R g vs. M for PEhd were established. The dependence of structural parameters g = ( R g 2 ) branch /( R g 2 ) linear and g ′ = [η] branch /[η] linear on the molecular weight was determined for three samples of PEld.