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Commercial linear low density polyethylene (LLDPE) and linear very low density polyethylene (VLDPE) produced with traditional high activity Ziegler-Natta (Z-N) and metallocene (single site) catalysts, respectively,have been characterized by dynamic mechanical thermal analysis (DMTA). The results demonstrated that particularly the study of the ~relaxations from the tan 6 and the loss modulus curves may give valuable information of differences in branching amounts and distributions of different types of polyethylene. The intensity of the tan 6 maximumpeak increasedwith the incorporation of more comonomer(more amorphous species,more branchingand lowerdensity).The metalbcene polymers,with the exceptionof the metallocene LLDPE studied, gave the highest tan 6 intensity values which demonstrated the ease of incorporatinghighercomonomeramounts in the case of singlesite polymers.The studied metallocene LLDPE polymer showeda behaviour very close to that of low density polyethylene (LDPE). For the metallocenepolymerscorrelations betweenthe tan d maximavalues and the meltingpoints, densitiesand comonomer contents, respectively,were obtained. In many cases the study of the maxima of the loss mo

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Author

PAUL STARCK

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0014-3057)

Published

1997

Language

EN

Field

Materials Science (Physical Sciences)