Browsing by Author "Lourenco, J. P."
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- UHMWPE/HDPE in-reactor blends, prepared by in situ polymerization: synthetic aspects and characterizationPublication . Ferreira, A. E.; Cerrada, M. L.; Pérez, Ernesto; Lorenzo, V.; Vallés, E.; Ressia, J.; Cramail, H.; Lourenco, J. P.; Ribeiro, M. R.This work covers the synthesis and characterization of in-reactor Ultra-High Molecular Weight Polyethylene/ High Density Polyethylene, UHMWPE/HDPE, blends by in situ polymerization in a single reactor, through dual catalyst immobilization. These blends are synthesized combining two different catalysts (one for each targeted molar mass) co-immobilized in mesoporous Santa Barbara Amorphous, SBA-15, particles. First, the ethylene polymerization behavior is investigated, under different polymerization conditions. Then, studies on the thermal, mechanical and rheological characteristics of the produced in-reactor blends are presented and their performance is compared and discussed in a comprehensive way. Moreover, the effect of different filler contents on the properties exhibited by the resulting materials is investigated. Results have shown that these in-reactor UHMWPE/HDPE blends exhibit a complex thermal, mechanical and rheological behavior, which depends mainly on the proportion between the two polymer components and on the amount of SBA-15.