Analysing the diameter evolution of the liquid bridge undergoing capillary thinning and breakup can yield fluid properties including the extensional relaxation time based on a theory for model fluids. SEM. Scanning electron microscope images were taken using a Quattro S environmental scanning electron microscope (Thermo Fisher Scientific, Waltham, MA, USA). Imaging of materials collected on glass substrates was performed in low vacuum mode with a pressure range of 50-75 Pa and beam voltage of 10-15 kV using a low vacuum detector. Samples analysed on foil substrates were imaged in high vacuum mode with a beam voltage of 5 kV using an Everhart-Thornley detector. Images were analysed in ImageJ software to measure fibre diameters.