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Title: Influence of catalytic systems on the synthesis of (dis)entangled UHMWPE and its implications on mechanical properties
Author: Romano, Dario
ISNI:       0000 0004 5354 5119
Awarding Body: Loughborough University
Current Institution: Loughborough University
Date of Award: 2014
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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.
Supervisor: Not available Sponsor: Teijin Aramid, Loughborough University
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: UHMWPE ; Disentangled ; Polyethylene ; Catalyst ; Co-catalyst ; Modifier ; BHT ; FI ; Polymerisation ; Mechanical properties ; Uniaxial deformation