Extrusion of CO₂/n-pentane blends in polystyrene

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Proceedings titlePPS 2005 America's Regional Meeting Proceedings
ConferencePolymer Processing Society (PPS) Regional Meeting 2005, August 14-17, 2005, Québec, Québec, Canada
Pages# of pages: 2
AbstractBlends of CO₂ and n-pentane were extruded in polystyrene. Rheological characterization of the system using the on-line slit die showed that n-pentane is a more effective plasticizer than CO₂ on an equivalent molar basis. This is consistent with previous findings indicating that larger gas molecules create more internal spacing at the molecular level. Solubility and homogeneity of the blends was also probed using ultrasonic monitoring. It was observed that degassing pressure in CO₂/n-pentane blends was CO₂-dependant only. This feature enables to increase the global gas loading in a foaming system in order to improve the expansion ratio without compromising on the gas pressure exiting the die, which may cause extrusion defects. Moreover, adding a lower diffusing agent such as n-pentane is expected to decrease the overall diffusion rate of the blend. Foam characterization results revealed that incorporating n-pentane to CO₂ lowered the density further while producing foam samples comtaining virtually no open-cells as compared to its pure CO₂ counterpart.
Publication date
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedNo
NRC number54301
NPARC number18399001
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Record identifier95f13a72-ee6b-4029-b8ac-8c151b8e3ff0
Record created2011-08-23
Record modified2016-05-09
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