A Newly Designed Dual-Functional Epoxy Monomer for Preparation of Fishbone-Shaped Heterochain Polymer with a High Damping Property at Low Temperature

A novel high purity dual-functional epoxy monomer, diglycidyl ether of 4,4-diallyl-bisphenol-A, is deliberately designed for the construction of a fishbone-shaped heterochain polymer by polymerizing it with the methyl phenyl polysiloxane. Their curing reactions with Jeffamine D230 are investigated. The cured fishbone-shaped heterochain polymer presents a wide transition range spanning over 120 degrees C with a peak half-width of 62 degrees C. In contrast to the traditional epoxy/polysiloxane materials, the cured fishbone-shaped heterochain polymer takes full advantage of the cooperative effect of epoxy and polysiloxane exhibiting excellent damping properties (tan >0.3) at temperatures near the T-g of the polysiloxane. This outstanding low-temperature damping performance can be ascribed to the fishbone-shaped structure of the heterochain polymer. These results provide new approach to explore high damping materials used at extremely low temperature (-125 degrees C).