A methylvinyl silicone rubber and a room-temperature vulcanized(RTV) graft silicone rubber were studied with the positron annihilation technique. It is shown that τ 1 and τ 2 for the RTV rubber are longer than those in the former
but τ 3 is shorter than these for the former. A qualitative explanation for the facts is given.
School of Physics and Technology, Hubei Key Laboratory of Nuclear Solid State Physics, Wuhan University
Suzhou Nuclear Power Research Institute
School of Physics and Technology, Hubei Key Laboratory of Nuclear Solid State Physics, Wuhan University
School of Physics and Technology, National Demonstration Center for Experimental Physics Education(Wuhan University), Hubei Nuclear Solid Physics Key Laboratory, Wuhan University