Metallocene

a newer generation of commercial polymerization catalysts for polyolefins

is best known for its “single sitednss”

and the intermolecular structural homogeneity of metallocene polyethylene copolymer is a very interesting research issue. The molecular segregation effects on the crystallization

melting and crystal morphologies of metallocene SCBPE have been investigated with DSC and TEM.The multiple endothermic peaks were observed in the DSC thermograms during heating experiments. The heterogeneity increases as branching content increases

the lamellae becomes thinner

and lamellae distribution becomes broder. Both macroscopic segregation (between two crystal aggregates) and microscopic setreation (between two lamellae)have been observed when SCBPE crystallized from phase separated melt.