Structural and property correlations of ethylen-α-olefin copolymers

Ethylene-olefin copolymers differ from other polyethylenes in that:

-	there is no long chain branching;
-	short chain branching is determined by the comonomer unit;
-	the molecular mass distribution is sharp;
-	the side chain distribution on different molecules is broad;
-	the sequential distribution of branching is very broad along the molecular chains, which becauses a multi-peak lamella distribution, and a multi-peak melting heat.

With the help of a cross-fractionation method we interpreted the differences of the experimental data, according to the molecular mass fractionation and the branching received.