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The preparation of high extent of phase mixing in highly incompatible interpenetrating polymer network systems has been a challenging task because the thermodynamics of phase separation are so powerful.Here,we propose a facial strategy to design a forcedintermixing epoxy/polysiloxane network by utilizing a novel epoxy/polysiloxane monomer (SH-EP) in one-pot synthesis.The relationship of structure and property is systematically investigated by FTIR,Rheometer,SEM,and DMA analysis.Impressively,the epoxy and polysiloxane networks can be driven to closely interpenetrate by their intrinsic motive force derived from the forcedsites in SH-EP,which in turn,may easily give rise to bicontinuous morphology.Besides,the gelation time is systematically controlled by varying the polysiloxane contents and pre-curing temperature.By tuning gelation time,the extent of phase mixing and the degree of phase separation can be further regulated.The result is striking: for the first time,this highly incompatible epoxy/polysiloxane intermixing networks exhibit ultralow-temperature damping properties (tan δ>0.3) over a very broad temperature range of 217 ℃ (from-114 ℃ to 103 ℃).This finding may disrupt the frontiers of materials knowledge.