Comparison of the shear and elongational rheological behaviour of metallocene-catalyzed and conventional polyethylenes

Autori: F.P. La Mantia, R. Scaffaro
Presentato al: Southern Europe Conference on Rheology
Anno: 1999
Volume: 1
Issue: Unico
Casa Editrice: SIR-Cuen Napoli
Lingua: English


Abstract
The rheological behaviour of polyethylenes is mainly dominated by the molecular weight and by the type and the amount of chain branches. However, molecular weight distribution and the distribution of the chain branches can play an important role. Indeed, the melt rheology of linear low density polyethylene (LLDPE) is significantly different from that of the low density polyethylene (LDPE) not only for the different length of the branches, but also for the narrower molecular weight distribution.
The new class of polymers produced by single site catalysis, such as metallocene catalysts (1), possess a peculiar structure characterized by a narrow molecular weight distribution and by a remarkable regularity in the comonomer distribution along the main chain. Polyethylenes produced with this catalysis - m-PE - are characterized, then, by a homogeneous distribution of the comonomer (short chain branching) at uniform content among the molecules.


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