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A. Prociak, J. Pielichowski

The effect of a hydrocarbon porophor on the expansion of rigid polyurethane foams

Polimery 1997, No 9, 544

DOI: dx.doi.org/10.14314/polimery.1997.544


Expansion courses of rigid PUR foams, v iz ., induction period, cream time, tack-free time, foam rise, increase in reactant temperature, and the molecular weight of the prepolymer forming during the initial step of the reaction (up to creamy appearance) as also the thermal conductivity of, and cell structure in the final foam were studied in relation to composition and temperature of saturated C5—C6 hydrocarbons blends used as blowing agents; 1-dichloro-1-fluoroethane was used as a reference blowing agent. A blend of hydrocarbons boiling over 28—63°C (Table 1, blend 4) was found to be particularly effective.

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