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Temperature dependence of crystalline structure and DC performance in LLDPE/HDPE blending material

Temperature dependence of crystalline structure and DC performance in LLDPE/HDPE blending material
Temperature dependence of crystalline structure and DC performance in LLDPE/HDPE blending material
Thermoplastic blending material is considered as a recyclable environmental-friendly potential candidate for future direct current (DC) cable insulation. Although such a non-crosslinking material has been proved to be superior in certain properties compared with cross-linked polyethylene (XLPE), one of the central concerns for the application of this material system lies in its DC performance at high temperature. In this paper, we investigate the DC conductivity and breakdown strength of a thermoplastic linear low-density polyethylene (LLDPE)/high-density polyethylene (HDPE) blending material under temperature range from 30 to 90℃, the results show that this blend exhibits better temperature-stability in DC performance, and it shows lower conductivity and higher breakdown strength compared with XLPE. The crystalline structure is studied through X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results show that the LLDPE/HDPE blend exhibits a co-crystalline structure with higher crystallinity and larger microcrystal, and when temperature rising, crystallinity and microcrystal size of blend decreases slower compared with XLPE. Such results might enable further application of the LLDPE/HDPE blend on DC cable insulation.
polyethylene, temperature dependence, breakdown strength, conductivity, co-crystalline, crystalline structure
1070-9878
754-759
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Zhang, Kai
d47b6912-dcda-4ab9-9655-228f767911fb
Zhong, Lisheng
25352160-ad90-495d-98e9-579630785b16
Gao, Jinghui
975e4d38-2774-493b-9350-c5fd8ccf2f2b
Li, Lunzhi
4f282a28-c959-4607-866a-5879aabfabdc
Cao, Liang
6261cdb2-c930-40ad-b06f-1444b65bc4d7
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Zhang, Kai
d47b6912-dcda-4ab9-9655-228f767911fb
Zhong, Lisheng
25352160-ad90-495d-98e9-579630785b16
Gao, Jinghui
975e4d38-2774-493b-9350-c5fd8ccf2f2b
Li, Lunzhi
4f282a28-c959-4607-866a-5879aabfabdc
Cao, Liang
6261cdb2-c930-40ad-b06f-1444b65bc4d7

Chen, Guanghui, Zhang, Kai, Zhong, Lisheng, Gao, Jinghui, Li, Lunzhi and Cao, Liang (2019) Temperature dependence of crystalline structure and DC performance in LLDPE/HDPE blending material. IEEE Transactions on Dielectrics & Electrical Insulation, 26 (3), 754-759. (doi:10.1109/TDEI.2018.007652).

Record type: Article

Abstract

Thermoplastic blending material is considered as a recyclable environmental-friendly potential candidate for future direct current (DC) cable insulation. Although such a non-crosslinking material has been proved to be superior in certain properties compared with cross-linked polyethylene (XLPE), one of the central concerns for the application of this material system lies in its DC performance at high temperature. In this paper, we investigate the DC conductivity and breakdown strength of a thermoplastic linear low-density polyethylene (LLDPE)/high-density polyethylene (HDPE) blending material under temperature range from 30 to 90℃, the results show that this blend exhibits better temperature-stability in DC performance, and it shows lower conductivity and higher breakdown strength compared with XLPE. The crystalline structure is studied through X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results show that the LLDPE/HDPE blend exhibits a co-crystalline structure with higher crystallinity and larger microcrystal, and when temperature rising, crystallinity and microcrystal size of blend decreases slower compared with XLPE. Such results might enable further application of the LLDPE/HDPE blend on DC cable insulation.

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Accepted/In Press date: 4 August 2018
e-pub ahead of print date: 29 May 2019
Published date: June 2019
Keywords: polyethylene, temperature dependence, breakdown strength, conductivity, co-crystalline, crystalline structure

Identifiers

Local EPrints ID: 423224
URI: http://eprints.soton.ac.uk/id/eprint/423224
ISSN: 1070-9878
PURE UUID: c00768f8-5fb7-4268-8d52-f42b63b5dd14

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Date deposited: 19 Sep 2018 16:30
Last modified: 14 Sep 2021 17:33

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