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Title: Influence of catalytic systems on the synthesis of (dis)entangled UHMWPE and its implications on mechanical properties
Authors: Romano, Dario
Keywords: UHMWPE
Disentangled
Polyethylene
Catalyst
Co-catalyst
Modifier
BHT
FI
Polymerisation
Mechanical properties
Uniaxial deformation
Issue Date: 2014
Publisher: © Dario Romano
Abstract: Two different catalysts (bis[N-(3-tert-butylsalicylidene)-pentafluoroanilinato] titanium (IV) dichloride and [1-(8-quinolyl)indenyl] chromium (III) dichloride catalysts) activated with aluminoxane based co-catalysts (MAO, PMAO, MMAO12 and MMAO3A) have been evaluated in the polymerisation of ethylene leading to UHMWPE having a reduced number of entanglements between the chains. The effect of a co-catalyst modifier (BHT) on the catalytic systems and the resulting polymers is also addressed. Both catalysts are capable to promote the synthesis of UHMWPE having a reduced amount of entanglements in the conditions used. Uniaxial solid-state deformation of UHMWPE samples of different molar masses have been evaluated and related with the entanglement state of the polymers synthesised. A clear relationship between some mechanical properties and the molar mass/entanglement density of the polymers synthesised has been found.
Description: A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.
Sponsor: Teijin Aramid, Loughborough University
URI: https://dspace.lboro.ac.uk/2134/14446
Appears in Collections:PhD Theses (Materials)

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