Heat shrink materials、 also known as polymer shape memory materials、 are an intelligent material that combines polymer materials with radiation processing technology. Ordinary polymer materials such as polyethylene and polyvinyl chloride are usually linear structures. After being irradiated by radiation sources such as electron accelerators to form a network structure、 these materials will have a unique "memory effect". Expanded and cooled materials can shrink back to their original shape after being heated. The memory performance of heat shrink materials can be used to make heat shrink pipes、 films、 and shaped materials. The main characteristic is that the heat shrink coating is on the outer surface of the object、 which can play a role in insulation、 moisture-proof、 sealing、 protection、 and connection. The radial shrinkage rate of the shrink material can reach 50% -80% P>
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