PE100 | MATERIALS
Microstructural analysis – using different DSC and rheological techniques – showed that PE resins with uniform co-monomer distribution were more sensitive to carbon black aggregates and their polymeric carriers. However, a Full Notched Creep Test (FNCT) showed that the same samples with more resistant to creep.
Adding carbon black masterbatch decreased
resistance to slow crack growth, as carbon black aggregates can act as stress concentration spots in the structure, said the researchers. However, adding the masterbatch with LDPE carrier polymer reduced this, compared to the HDPE carrier. The researchers say this is because long branches of LDPE polymer enter the structure of lamellae in the PE100 resins – making them more coherent, and increasing the number of tie molecules. Samples blended with LDPE polymer had a
rougher surface, meaning that linkage between two sides of a crack was stronger due to higher entanglement density in these samples. The impact test confirmed the same trend as the FNCT test, with the sample containing LDPE carrier having a higher impact strength. The results of the study were published in a recent issue of Polymer Testing.
Geoexchange system The current winner of the Plastics Pipe Institute project of the year – in building and construction – is a geoexchange system at a large airport in Canada. The project involved member company Versap-
rofiles of Saint-Lazare-de Bellechasse in Canada, which supplied geothermal ‘loops’ for the con- struction. Vancouver International Airport’s new Central Utilities Building (CUB) will improve efficiency by centralising all of the equipment needed to meet the airport’s heating, cooling and electrical demand. To do this, the project will rely on one of the
largest geoexchange systems in Canada. This system will use the earth’s renewable energy – just below the surface – to provide sustainable heating and cooling for the terminal. The project used nearly 160 miles (more than
840,000ft) of 1.25in HDPE 4710 piping. The borefield for the geoexchange system includes 841 boreholes – each 500ft deep – equivalent to nearly 80 miles (420,000ft) of drilled borehole. The system is expected to reduce CO2 emissions from heating and cooling demands by up to 35%.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.borealisgroup.com �
www.politejo.com �
www.pe100plus.com �
www.kiwa.com �
www.kazanorgsintez.ru/en/ �
www.agru.at �
www.en.sharif.edu �
www.plasticpipe.org �
www.versaprofiles.com/en
Above: Vancouver International Airport is building a geoexchange system that uses PE4710 piping from Versaprofiles
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