Method for the one-step programming of the three-shape plastics
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United States of America Patent
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Feb 4, 2014
Grant Date -
Feb 25, 2010
app pub date -
Jan 24, 2008
filing date -
Feb 22, 2007
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Abstract
The invention relates to a method for producing a programmed shape memory polymer, which assumes a first temporary shape and at least two additional stored thermally activatable shapes, namely at least one second temporary shape and a permanent shape, with the steps of:
- (a) providing a shape memory polymer which has at least two switching segments (A, B), which through phase segregation each form a switching phase having each a corresponding transition temperature (TtransA, TtransB),(b) deforming the shape memory polymer into a shape corresponding to the first temporary shape at a temperature above the upper transition temperature (TtransA), and(c) cooling to a temperature below the lower transition temperature (TtransB) by fixing the first temporary shape.The method of the invention provides a one-step programming method for a triple-shape plastic material.
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