Weldability of pipe grade polyethylenes as realized from thermal and mechanical properties assessments

Vahabodin Goodarzi; Zahed Ahmadi; Mohammad Saeb; Farkhondeh Hemmati; Mehdi Ghaffari; Krzysztof Formela

doi:10.1515/polyeng-2015-0242

Weldability of pipe grade polyethylenes as realized from thermal and mechanical properties assessments

Abstract

Since polyethylene (PE) has been widely accepted for the production of high-pressure fluid conveying pipelines, studies devoted to weldability of PE connections were always of major importance. In this study, two industrial PE grades designed for pipe production, namely PE80 and PE100, were injection molded, cut, and then welded as PE100-PE100, PE100-PE80, and PE80-PE80. The heat-welded joints were assessed by differential scanning calorimetry and tensile measurements. The results obtained from thermal and mechanical analyses were compared with equivalents for aged samples. Thermal analysis revealed that the melting point of the PE100-PE100 sample is obviously larger than the one for the PE80-PE80 joint, for the PE80 chains deteriorate the crystallization of PE100. Further, the PE80-PE80 sample showed the lowest lamellar thickness and crystalline molecular weight among the studied joints. The aging process was found to increase lamellar thickness and molecular weight, though in the PE100-PE100 sample such quantities very limitedly increased. The yield stress of aged joints was higher than that for just-prepared samples, while an inverse trend was seen for strain at break. From a practical viewpoint, the PE100-PE100 welds offer better properties.

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Authors (6)

Vahabodin Goodarzi
- Baqiyatallah University of Medical Sciences, Tehran, Iran Applied Biotechnology Research Center
Zahed Ahmadi
- Amirkabir University of Technology, Tehran, Iran Color and Polymer Research Center
Mohammad Saeb
- Institute for Color Science and Technology, ehran, Iran Department of Resins and Additives
Farkhondeh Hemmati
- Amirkabir University of Technology, Tehran, Iran Department of Polymer Engineering and Color Technology
Mehdi Ghaffari
- Golestan University, Gorgan, Golestan, Iran Polymer Group
Krzysztof Formela dr inż.

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: JOURNAL OF POLYMER ENGINEERING no. 36, edition 8, pages 853 - 860,
ISSN: 0334-6447
Language:: English
Publication year:: 2016
Bibliographic description:: Goodarzi V., Ahmadi Z., Saeb M., Hemmati F., Ghaffari M., Formela K.: Weldability of pipe grade polyethylenes as realized from thermal and mechanical properties assessments// JOURNAL OF POLYMER ENGINEERING. -Vol. 36, iss. 8 (2016), s.853-860
DOI:: Digital Object Identifier (open in new tab) 10.1515/polyeng-2015-0242
Verified by:: Gdańsk University of Technology