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Rigid polyurethane foams were moulded with using cyclopentane, HCFC 141b and HFC 365/227 as physical blowing agents. Formulations with various amounts of blowing agents were elaborated and foams showing different density were prepared. The effects of the type and content of blowing agent on the physical, mechanical properties and thermal conductivity of the foams while ageing were investigated. The...
Blowing agents play an important role in the production of cellular polyurethanes. The traditional chemical blowing agent H2O/CO2 did not meet all application requirements. This led to the introduction of physical foaming agents in the 1950–1960s, which were subject to four further modifications due to climatic hazards. The recently introduced new generation of hydrofluoroolefins (HFOs) hydrocarbons...
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