Highly Ductile Polypropylene Based Ternary Blends for High Voltage Insulation
Artikel i vetenskaplig tidskrift, 2025

High voltage insulation materials must combine excellent dielectric and thermomechanical properties. Ternary blends based on isotactic polypropylene (PP) tend to feature a low electrical conductivity and high melting temperature but are usually characterized by a too low ductility. Here, it is shown that the cooling rate can be used to significantly improve the ductility without compromising the otherwise excellent property portfolio. Rapid cooling of ternary blends comprising PP, low-density polyethylene (LDPE) and a polystyrene-b-(ethylene-co-butylene)-b-polystyrene (SEBS) elastomer is found to result in a material with an elongation at break above 500%, which is maintained even after prolonged annealing at up to 135 degrees C. At the same time, the ternary blend continues to exhibit a high elastic modulus above the melting temperature of LDPE and a low direct-current (DC) electrical conductivity of 0.7 x 10-15 S m-1 at 70 degrees C and an electric field of 30 kV mm-1. Evidently, rapid cooling of PP-based insulation materials can facilitate the preparation of highly ductile insulation materials.

insulation materials

structure-property relationships

dielectric properties

thermoplastics

polyolefin blends

Författare

Przemyslaw Sowinski

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Xiangdong Xu

Chalmers, Elektroteknik, Elkraftteknik

Thomas Gkourmpis

Borealis AB

Per-Ola Hagstrand

Borealis AB

Christian Müller

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Journal of Applied Polymer Science

0021-8995 (ISSN) 1097-4628 (eISSN)

Vol. In Press

Ämneskategorier (SSIF 2025)

Materialkemi

Polymerkemi

Polymerteknologi

Infrastruktur

Chalmers materialanalyslaboratorium

DOI

10.1002/app.56955

Mer information

Senast uppdaterat

2025-03-28