An interpenetrating polymer networks is a polymeric alloy in which the thermodynamics characteristics of the components comprised the SIN dominates miscibility between the components

microphase structures and therefore the damping behaviors of the SIN materials．In this paper

based on polyphenylsiloxane (PMPS) and polymethacrylate (PMAc)

a series of novel simultaneous full-interpenetrating polymer networks (SIN) materials have been synthesized

and simultaneously the relationship between a compatibility of the components consisted of the SIN and the damping properties of the SIN has been investigated from solubility parameters

DMA

and AMF etc． The results show that the SIN materials derived from the components with better compatibility have the maximum damping value of tanδmax=1.4

the sample only appearing one glass temperature peak and showing dual phase continue structures. On the contrast the sample has the widest effective damping function area whose range of temperature with tanδ ≥ O.3 can arrive to 170℃

when the components of the SIN possesses a medium compatibility

the materials displaying monophase continue structures．And moreover the SIN sample made by the components with the worst compatibility split the loss peak into two．Therefore

the damping characteristics of the PMPS/PMAc SIN materials can be tailored through regulating the compatibility of the corresponding components．