Influences of the Preparation Temperature on the Acoustic Parameters of Polyurethane

In this paper, the influence of the preparation temperature on the absorption coefficient and acoustic parameters of polyurethane was studied. Best sound absorption coefficient of polyurethane at high frequency is at 50℃, followed is 30℃ and 40℃,70℃ is lowest. Between 20~50℃, the flow resistance increased rapidly with the temperature increasing, the minimum flow resistance at 50℃, maximum value at 70℃.The trend of porosity with temperature is similar to that with flow resistance. With the temperature increasing, the porosity decreases first and then increases, minimum value at 50℃. Flow resistance dominating the flow resistance of the sound absorption performance.