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- W2899154481 abstract "Rigid polyurethane (PU) microcellular foams with high expansion ratio and uniform cell morphology can be prepared directly using supercritical carbon dioxide (CO2) as blowing agent. The in-situ viscosity measurements during PU polymerization in high-pressure CO2 were adopted to investigate the melt strength change as well as the PU foaming windows. It was found that a certain viscosity window existed for available foaming, which changed little with the foaming temperature or CO2 pressure, but the required reaction time to reach this viscosity foaming windows changed a lot because the existence of CO2 significantly delayed the viscosity rising. Furthermore, the viscosity foaming windows varied with different PU formula systems, e.g., about (300–400) Pa∙s for C-1/PAPI-135C system which could be foamed with cell size smaller than 10 μm, and about (245–400) Pa∙s for R090/PM200 system which was foamed with bigger cell size of (20–40) μm." @default.
- W2899154481 created "2018-11-09" @default.
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- W2899154481 date "2019-05-01" @default.
- W2899154481 modified "2023-09-27" @default.
- W2899154481 title "Foaming window for preparation of microcellular rigid polyurethanes using supercritical carbon dioxide as blowing agent" @default.
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- W2899154481 doi "https://doi.org/10.1016/j.supflu.2018.11.001" @default.
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