Highly insulating thermoplastic nanocomposites based on a polyolefin ternary blend for high-voltage direct current power cablesShow others and affiliations
2022 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 14, no 21, p. 7927-7933Article in journal (Refereed) Published
Abstract [en]
Octyl-silane-coated Al2O3 nanoparticles are found to be a promising conductivity-reducing additive for thermoplastic ternary blends comprising low-density polyethylene (LDPE), isotactic polypropylene and a styrenic copolymer. The ternary blend nanocomposites were prepared by compounding the blend components together with an LDPE-based masterbatch that contained the nanoparticles. The nanoparticles did not affect the superior stiffness of the ternary blends, compared to neat LDPE, between the melting temperatures of the two polyolefins. As a result, ternary blend nanocomposites comprising 38 wt% polypropylene displayed a storage modulus of more than 10 MPa up to at least 150 degrees C, independent of the chosen processing conditions. Moreover, the ternary blend nanocomposites featured a low direct-current electrical conductivity of about 3 x 10(-15) S m(-1) at 70 degrees C and an electric field of 30 kV mm(-1), which could only be achieved through the presence of both polypropylene and Al2O3 nanoparticles. This synergistic conductivity-reducing effect may facilitate the design of more resistive thermoplastic insulation materials for high-voltage direct current (HVDC) power cables.
Place, publisher, year, edition, pages
2022. Vol. 14, no 21, p. 7927-7933
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:miun:diva-45117DOI: 10.1039/d1nr08255hISI: 000797957800001PubMedID: 35593376Scopus ID: 2-s2.0-85131269214OAI: oai:DiVA.org:miun-45117DiVA, id: diva2:1663965
2022-06-032022-06-032024-08-13Bibliographically approved