The work presented in this dissertation is primarily aimed at improving the understanding of the electrical properties of the insulating polymer crosslinked polyethylene (XLPE) in order to support its use as power cable insulation. XLPE has been used for decades as the material …
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A novel on-line capillary rheometer (OLR) was used to examine the shear and extensional characteristics of polyolefin melts during twin screw extrusion (TSE). Comparisons with off-line rheometry were made using a twin-bore capillary rheometer and a modular in-line slit die rheom…
In the present doctoral research, the chain relaxations and dynamics present in linear disentangled ultra-high molecular weight polyethylene (both pure and as a composite) were investigated and presented. Considering its disentangled character, the relaxation dynamics and the fo…
In the recent past it has been found that a considerable pressure drop occurred during the extrusion of linear polyethylene in the course of capillary flow. The pressure drop resides within a narrow temperature window of one to two degrees Celsius. In this research the hydrodyna…
Polymeric systems become increasingly complicated and multifunctional if they involve a larger level of structural complexity. In the last couple of decades the level of interest has gradually shifted from the μm-scale to the nm-scale region, for instance, systems having at leas…
The advancement of nuclear technology has resulted in new and unique thermal reactor designs beyond the typical light water reactors which currently dominate the reactor fleet. The verification and validation advanced thermal reactor performance require an accurate understanding…
Slow crack growth (SCG) is a time-dependent brittle-type failure that polyethylene (PE) pipes suffer from when under low stress levels. In order to achieve a required lifetime of minimum 50 years, a deep understanding of material's properties is needed. The general accepted mech…