Etude cinétique de l’influence des agents d’expansion de réaction de polymérisation des polymérisation des polyuréthanes

Abstract

Sommary :Our study focuses on the synthesis and modeling of rigid polyurethane. It has been developed by an addition reaction between isocyanate and polyol using the three physical blowing agents (C5, n-P5 and DCM) and a chemical blowing agent (CO2) whose purpose is to replace environmentally harmful blowing agents such as HCFCs and HFCs) and at the same time to obtain a material with good thermal insulation. Equipment and a specific experimental method have been developed. This made it possible to carry out various experiments on the development of polyurethane foams in terms of temperature profiles and foam rise height. These parameters are strongly dependent on the ratio, types of blowing agent and additives. Several mathematical models were detailed. These models have allowed to study the kinetics of polymerization by investigating the evolution of the conversion rate and the determination of the kinetic parameters of the reaction