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- W2089334462 abstract "Abstract The purpose of this study is to determine to what extent CO 2 can be used as a processing aid to melt process polyethylenes of higher molecular weight than can be typically melt processed. To assess the ability to melt process high molecular weight polyethylenes with CO 2 , the viscosity of a 460 000 g/mol high density polyethylene (HDPE) plasticized with various amounts of absorbed CO 2 in an extrusion process was determined using a slit die rheometer that was attached to the end of the extruder. A relationship was developed to determine the maximum molecular weight polyethylene that could be processed at a given viscosity reduction due to absorbed CO 2 . This relationship was tested by using CO 2 to process a blend of 40 weight percent ultra-high molecular weight polyethylene (UHMWPE) and the 460 000 g/mol HDPE which lead to an equivalent molecular weight of 720 000 g/mol. The viscosity of the blend with 12 weight percent CO 2 was reduced to that of the pure 460 000 g/mol HDPE as predicted by the relationship. Preliminary studies using a pressurized chamber attached to the exit of the die allowed one to assess the conditions under which suppression of foaming within fibers or other extruded forms is possible." @default.
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- W2089334462 date "2008-05-01" @default.
- W2089334462 modified "2023-09-26" @default.
- W2089334462 title "Melt Processability and Foam Suppression of High Molecular Weight Polyethylenes Plasticized with Supercritical Carbon Dioxide" @default.
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- W2089334462 doi "https://doi.org/10.3139/217.2068" @default.
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