Demonstrates adjustable shape memory properties in ethylene-vinyl acetate/butadiene rubber thermoplastic vulcanizate, indicating useful applications in adaptive materials.
A novel polymer based on the ethylene-vinyl acetate copolymer (EVA)/butadiene rubber (BR) thermoplastic vulcanizate (TPV) with adjustable heat-triggered shape memory property was prepared by dynamic vulcanization. The morphology structure of the EVA/BR TPV was a sea-island structure with the crosslinked BR particle sizes ranging from 3 μm to 6 μm. The melting and crystallization behavior of the EVA/BR TPV was tested by differential scanning calorimetry (DSC), and the result showed that the melting points of the EVA and the EVA/BR TPV were about 86 °C. The shape memory results showed that the excellent shape memory property of the EVA/BR TPV could be adjusted effectively by changing the weight ratio of EVA/BR, shape deformation temperature (Td) and shape recovery temperature (Tr), with both the shape fixation ratio (SF %) and shape recovery ratio (SR %) of the EVA/BR TPV exceeding 95% at the certain condition (Td = 85 °C, Tr = 85 °C, the weight ratio of EVA/BR = 80/20). It should be noticed that the shape recovery time could be reduced obviously with the decreasing weight ratio of the EVA/BR.
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Gong et al. (2026) studied this question.
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