High-temperature creep resistant ternary blends based on polyethylene and polypropylene for thermoplastic power cable insulation
Journal article, 2021

The impact of a small amount of polystyrene-b-poly(ethylene-co-butylene)-b-polystyrene (SEBS) on the thermomechanical and electrical properties of blends comprising low-density polyethylene (LDPE) and isotactic polypropylene (PP) is investigated. SEBS is found to assemble at the PP:LDPE interface as well as within isolated PP domains. The addition of 10 wt% SEBS significantly increases the storage modulus between the melting temperatures of the two polyolefins, 110 and 160°C, and results in improved resistance to creep during both tensile deformation as well as compression. Furthermore, the ternary blends display a very low direct-current (DC) conductivity as low as 3.4 × 10  S m at 70°C and 30 kV mm , which is considerably lower than values measured for neat LDPE. The here presented type of ternary blend shows potential as an insulation material for high-voltage direct current power cables.

polyethylene

high-voltage power cable insulation

thermoplastic

copolymer

polypropylene

Author

Yingwei Ouyang

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Christian Müller Group

Amir Masoud Pourrahimi

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Christian Müller Group

Anja Lund

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Xiangdong Xu

Chalmers, Electrical Engineering, Electric Power Engineering, Power grids and Components

Thomas Gkourmpis

Borealis AB

Per Ola Hagstrand

Borealis AB

Christian Müller

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Christian Müller Group

Journal of Polymer Science

26424150 (ISSN) 26424169 (eISSN)

Vol. In Press

Subject Categories

Other Materials Engineering

Other Electrical Engineering, Electronic Engineering, Information Engineering

Condensed Matter Physics

DOI

10.1002/pol.20210147

More information

Latest update

5/25/2021