Feasibility of Mini-Scale Injection Molding for Resource-Efficient Screening of PP-Based Cable Insulation Nanocomposites

Ilkka Rytoluoto, Eetta Saarimaki, Jani Pelto, Mika Paajanen, Xiaozhen He, Rafal Anyszka, Amirhossein Mahtabani, Wilma Dierkes, Paolo Seri, Hadi Naderiallaf, Kari Lahti, Minna Niittymaki

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This study presents a critical evaluation of the effect of two different sample manufacturing techniques on the morphological and dielectric properties of polypropylene (PP)-based nanocomposites, namely mini-scale injection molding (IM) vs. pilot-scale cast film extrusion. Polarized light microscopy revealed that the IM specimen morphology exhibited a layered 'skin-core' type morphology, largely differing from the spherulitic morphology of the corresponding extruded cast films. Higher degree of crystallinity in the IM specimens was evidenced by calorimetric and X-ray diffraction methods. The processing-dependent morphological differences were found to affect the isothermal charging current (ICC) and thermally stimulated depolarization current (TSDC) characteristics due to differences in charge mobility and trapping, thus making direct comparison of IM and cast film specimens non-straightforward. Nevertheless, mini-scale injection molding can be seen as a resource-efficient sample manufacturing method for facilitating early-stage screening of the best-performing material candidates, given that the morphological features are carefully taken into account.

Original languageEnglish
Title of host publication2020 IEEE 3rd International Conference on Dielectrics, ICD 2020
Number of pages4
ISBN (Electronic)9781728189833
Publication statusPublished - 4 Feb 2021
Event3rd IEEE International Conference on Dielectrics, ICD 2020 - Virtual, Valencia, Spain
Duration: 5 Jul 20209 Jul 2020
Conference number: 3


Conference3rd IEEE International Conference on Dielectrics, ICD 2020
Abbreviated titleICD 2020
CityVirtual, Valencia

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