Stress relaxation properties of some reaction injection molded (RIM) and reinforced RIM systems

Abstract This study examined the stress relaxation properties of six urethane reaction injection molded (RIM) systems, both reinforced and non‐reinforced RIM systems from room temperature to 100°C. Data is presented which shows the dynamic mechanical (DMS), differential scanning calorimetry (DSC), physical properties, and stress relaxation data. The major conclusion from this work is that the state of hard segment (amorphous or crystalline) makes a vast difference in the polymer's reaction to stress.