Method for programming a shape memory polymer while defining the switch temperature by selection of the programming temperature
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United States of America Patent
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Jan 6, 2015
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Apr 22, 2011
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Jan 30, 2008
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Abstract
The invention relates to a method for programming a shape memory polymer, which comprises at least one switching segment having at least one thermal phase transition and covalent and/or non-covalent cross-linking points such that the shape memory polymer after the programming thereof is in a position to transition from a programmed temporary shape into the permanent shape thereof, following a temperature increase to a temperature that at least corresponds to a switching temperature (Tswitch, Tσmax). According to the invention, the method comprises (a) predetermining a programming temperature (tprog) as a function of a desired switching temperature (Tswitch, Tσmax), (b) heating the shape memory polymer to the predetermined programming temperature (tprog), and transferring the polymer into a shape that corresponds to the temporary shape by applying a forced molding state, and (c) cooling the polymer to a temperature below the desired switching temperature (Tswitch, Tσmax) while maintaining the forced molding state.
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