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Oral Poster Presentation
Synthesis of new non-isocyanate polyurethane foams based on cyclic triscarbonates and diaminesWednesday (07.10.2020) 19:16 - 19:19
Polyurethane (PU) foams are the most extensively used and well-known cellular polymers, representing more than half of the global market of foams, with a sustained growth over the years . The chemistry involved in the synthesis of the different PU foams is mainly centred on the isocyanate reactions, since isocyanate and polyol generate urethane groups which form the polymeric structure, at the same time as the foaming reaction occurs in which a gas is generated due to the addition of physical or chemical blowing agents . Thus, the isocyanates are indispensable raw materials to build the complex structure of a PU polymer. However, the most important commercial method for isocyanate production based on the phosgenation of amines presents a huge health problem, since the exposure to the phosgene used that is a highly toxic gas can cause severe respiratory effects, ocular irritation and burns to the eye and to the skin, and eventually to death . Moreover, the isocyanates monomers thus obtained also are harmful [3, 4]. Consequently, today many investigations are focused on studying non-isocyanate PU (NIPU) foams without requiring either phosgene or isocyanates in order to avoid special safety, health, and handling precautions and to meet the demands of green chemistry.
In this work, we study the synthesis of new NIPU foams from the reaction between cyclic carbonates and diamines. Basically, trimethylolpropane tris-carbonate is cured with hexamethylene diamine in presence of a physical blowing agent. The foaming parameters are evaluated to optimize the production of the NIPU foams. The density and cellular structure are characterized for the resulting NIPU foams.
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