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Properties of silanol-crosslinked polyethylene for the production of cold and hot water supply pipes and heating pipes
The high heat stability, good physicomechanical properties, low gas permeability, high resistance to corrosive media, and increased water resistance of silanol-crosslinked polyethylene (PEX-b) enable it to be used for the manufacture of hot and cold water supply pipes and heating pipes. It has been shown that hydrothermal treatment of hot water supply pipes and heating pipes ensuresa higher degree and density of crosslinking and accordingly the obtaining of stable service characteristics. Such treatment can be carried out after different pipe storage times, which leads to an increase in their degree of curing to 80%. The formation of a crosslinked structure of PEX-b occurs both as a result of hydrothermal treatment and during storage, but the degree of crosslinking and the structure of the network formed are different. During hydrothermal treatment the degree of crosslinking amounts to 70-75 %, whereas without this treatment it amounts to 53-55 %, even with pipe storage for almost 1 year. A comparative thermomechanical analysis showed that PEX-a (peroxide-crosslinked PE) has a glass transition temperature that is 10 K lower than that of PEX-b, i.e. softening of PEX-a underload begins at lower temperatures. Increase in temperature above 140 deg C causes the degradation of the polymer and the appearance of a second strain peak.
Properties of silanol-crosslinked polyethylene for the production of cold and hot water supply pipes and heating pipes
The high heat stability, good physicomechanical properties, low gas permeability, high resistance to corrosive media, and increased water resistance of silanol-crosslinked polyethylene (PEX-b) enable it to be used for the manufacture of hot and cold water supply pipes and heating pipes. It has been shown that hydrothermal treatment of hot water supply pipes and heating pipes ensuresa higher degree and density of crosslinking and accordingly the obtaining of stable service characteristics. Such treatment can be carried out after different pipe storage times, which leads to an increase in their degree of curing to 80%. The formation of a crosslinked structure of PEX-b occurs both as a result of hydrothermal treatment and during storage, but the degree of crosslinking and the structure of the network formed are different. During hydrothermal treatment the degree of crosslinking amounts to 70-75 %, whereas without this treatment it amounts to 53-55 %, even with pipe storage for almost 1 year. A comparative thermomechanical analysis showed that PEX-a (peroxide-crosslinked PE) has a glass transition temperature that is 10 K lower than that of PEX-b, i.e. softening of PEX-a underload begins at lower temperatures. Increase in temperature above 140 deg C causes the degradation of the polymer and the appearance of a second strain peak.
Properties of silanol-crosslinked polyethylene for the production of cold and hot water supply pipes and heating pipes
Eigenschaften von Silanol-vernetztem Polyethylen für die Herstellung von Heiß- und Kaltwasserversorgungsrohren und Heizrohren
Kikel, V.A. (Autor:in) / Osipchik, V.S. (Autor:in) / Lebedeva, E.D. (Autor:in)
International Polymer Science and Technology ; 33 ; T49-T52
2006
4 Seiten, 3 Tabellen, 6 Quellen
Aufsatz (Zeitschrift)
Englisch
Wasserversorgung , Heizrohr , Kunststoffrohr , Rohrstutzen , Heißwasser , Kaltwasser , Polyethylen , Vernetzung (Polymer) , Silanol , Wärmebeständigkeit , Wasserwiderstand , Gaspermeabilität , Korrosionsbeständigkeit , Aushärten (Polymer) , hydrothermales Verfahren , Altern , Lagerung (Aufbewahrung) , thermomechanische Analyse , Vergleichsanalyse , Peroxid , Glasübergangstemperatur , Differenzialscanningkalorimetrie , Kompression , Vernetzungsdichte , funktionelle Gruppe , Kristallinitätsgrad , Wärmebehandlung , Kristallisation , Temperaturbereich , Kristallisationstemperatur
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