Abstract
Interpenetrating polymer networks (IPNs) composed of vinyl compounds and phenolics were synthesized by combining simultaneous radical polymerization and phenolic curing reactions. To investigate the structure of products, two different types of IPNs were prepared. One, IPN 1, was formed through simultaneous reactions; the other, IPN 2, was formed through sequential reactions. Dynamic mechanical analysis, SEM observations, and tensile tests of these IPNs were performed. IPN 1 showed only one loss maximum, while IPN 2 showed two distinct loss maxima. These results indicate that vinyl polymer chains and cured phenolic chains in IPN 1 were well entangled with each other, while limited intermixing occurred in IPN 2. Compared with common vibration-damping materials, such as chloroprene rubber, the loss maxima of IPNs were at higher temperatures. Judging from the loss tangent values, IPNs are effective damping materials at elevated temperatures.
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