| 摘要 |
The invention relates to a method for producing a programmed shape-memory polymer which assumes a first temporary shape and has at least two further stored, thermally retrievable shapes, to be specific at least a second tempo rary shape and a permanent shape, with the steps of (a) providing a shape-me mory polymer, which comprises at least two switching segments (A, B), which are capable by phase segregation of respectively forming a switching phase w ith in each case a transition temperature (Ttrans,A, Ttrans,B), (b) deformin g the shape-memory polymer into a shape corresponding to the first temporary shape at a temperature above the upper transition temperature (Ttrans,A), a nd (c) cooling to a temperature below the lower transition temperature (Ttra ns,B), thereby fixing the first temporary shape. The method according to the invention provides a one-step programming method for a three-shape plastic.
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