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This talk will present work on the fabrication of shape memory polymers(SMPs)by blending elastomers and crystalline small molecules(e.g.wax or fatty acids).One example is the swelling of a natural rubber band with molten fatty acid.By this method a SMPs with excellent shape fixity and recovery can be obtained during free recovery after uniaxial deformation to large strain.This fabrication method offers a number of advantages for preparing SMPs.First,it utilizes natural rubber as the base material for the SMP,which capitalizes on a high performance,commodity elastomer.Second,by blending a commercial polymer with a small molecule additive no additional chemistry is needed for the preparation of the SMP.Third,this route inverts the typically processing steps by crosslinking the permanent network prior to formation of the physically crosslinked reversible network.This offers a means to potentially generate a SMP from any preformed elastomeric article.