Effects of Crosslinking Agent Concentration on the Physical Properties of Polyurethane for Underwater Sound Absorption

초록

In this study, the effects of crosslinker concentration on the physical and mechanical properties of polyurethane (PU), an underwater sound-absorbing material, were investigated. Trimethylolpropane (TMP) was employed as a crosslinker, and its concentration was adjusted to examine its impact on the material properties. Dynamic mechanical analysis, differential scanning calorimetry, Fourier-transform infrared spectroscopy, and tensile testing were performed to analyze the material characteristics. As the TMP content increased from 25% to 100%, the elastic modulus increased by approximately 103.8%, corresponding to a nearly 300% change in TMP concentration. The loss factor, which is closely related to sound-absorption performance, increased by up to 27.19% with increasing TMP content. Additionally, the loss factor was found to increase by up to 13.68% as the temperature decreased from 30 to 10°C. These findings indicate that the mechanical properties and loss factor of PU improved at lower temperatures and higher TMP concentrations, thereby providing insights into the effective design of sound-absorbing materials.

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