The United States of America as represented by the Secretary of the Air Force
대리인 / 주소
AFMCLO/JAZ
인용정보
피인용 횟수 :
0인용 특허 :
54
초록▼
A method for fabricating a shape memory polymer into a three-dimensional object is provided. The method includes forming a film of crosslinked poly(amic acid) on a substrate to provide a laminated substrate; forming the laminated substrate into a first configuration that is in a three-dimensional fo
A method for fabricating a shape memory polymer into a three-dimensional object is provided. The method includes forming a film of crosslinked poly(amic acid) on a substrate to provide a laminated substrate; forming the laminated substrate into a first configuration that is in a three-dimensional form; curing the cross-linked poly(amic acid) to provide the shape memory polymer having a permanent shape corresponding to the first configuration; and removing the substrate from the laminated substrate to provide the three-dimensional object comprising the shape memory polymer. The formation of the laminated substrate into the three-dimensional object may be based on origami techniques.
대표청구항▼
1. A method for fabricating a shape memory polymer into a three-dimensional object, comprising: a) forming a solution comprising an amine-terminated poly(amic acid) intermediate, wherein the solution comprises a solvent and a reaction product obtained by reacting a stoichiometric excess of an aromat
1. A method for fabricating a shape memory polymer into a three-dimensional object, comprising: a) forming a solution comprising an amine-terminated poly(amic acid) intermediate, wherein the solution comprises a solvent and a reaction product obtained by reacting a stoichiometric excess of an aromatic diamine monomer and a di-anhydride-containing monomer;b) treating the solution comprising the amine-terminated poly(amic acid) intermediate with a multi-functional anhydride crosslinking agent to thereby form a sol-gel comprising a crosslinked poly(amic acid);c) forming a film of crosslinked poly(amic acid) on a substrate to provide a laminated substrate;d) forming the laminated substrate into a first configuration that is in a three-dimensional form;e) curing the cross-linked poly(amic acid) to provide the shape memory polymer having a permanent shape corresponding to the first configuration, wherein the shape memory polymer comprises a crosslinked polyimide or a crosslinked poly(amide-imide); andf) removing the substrate from the laminated substrate to provide the three-dimensional object comprising the shape memory polymer. 2. The method of claim 1, further comprising: g) heating the three-dimensional object to a first temperature that is above a triggering temperature;h) deforming the three-dimensional object to a second configuration that is different from the first configuration; andi) lowering the three-dimensional object to a second temperature that is below the triggering temperature while the three-dimensional object is maintained in the second configuration. 3. The method of claim 1, further comprising: j) heating the three-dimensional object in the second configuration to a third temperature that is above the triggering temperature to thereby induce the self-rearrangement of the three dimensional object from the second configuration to the first configuration. 4. The method of claim 1, wherein forming a film of crosslinked poly(amic acid) on a substrate comprises: i) evaporating at least a portion of the solvent from the sol-gel comprising the crosslinked poly(amic acid); andii) optionally, partially curing the crosslinked poly(amic acid) to form the crosslinked polyimide or the crosslinked poly(amide-imide). 5. The method of claim 4, wherein evaporating at least a portion of the solvent further comprises heating the sol-gel comprising the crosslinked poly(amic acid) to a temperature in a range of about 50° C. to about 100° C. at a pressure less than about atmospheric pressure. 6. The method of claim 1, wherein the substrate comprises a metal that dissolves in an aqueous acid solution. 7. The method of claim 6, wherein the metal comprises aluminum. 8. The method of claim 1, wherein the multi-functional anhydride crosslinking agent is defined by a general chemical formula (I): Z—(—Ar—)n—W,wherein Z represents an anhydride functional group that is directly or indirectly bonded to Ar; Ar represents an aryl group that is directly bonded to W; and n is equal to 3 when W is P═O or N, or n is equal to 4 when W is Si or a carbon moiety. 9. The method of claim 8, wherein Ar is a phenyleneoxy group (—OPh-) that is para- or meta-substituted with respect to oxygen, and the agent is further defined by a general formula (II): Z—(—OPh-)n—W. 10. The method of claim 8, wherein Z and Ar in combination form a phthalic anhydride moiety that is directly bonded to W. 11. The method of claim 8, wherein Ar is a phenyleneoxy group (—OPh-) that is para- or meta-substituted with respect to oxygen, and wherein Z is a phthalic anhydride group that is connected to the phenyleneoxy group through an ether bond. 12. The method of claim 8, wherein W is P═O, wherein Ar is a phenyleneoxy group (—OPh-) that is para- or meta-substituted with respect to oxygen, and wherein the agent is further defined by a general formula (III): Z—(—OPh-)3—P═O. 13. The method of claim 12, wherein Z is a phthalic anhydride group that is connected to the phenyleneoxy group through an ether bond, and wherein the agent is further defined by a general formula (V): wherein R1 through R8 are independently selected from H or C1-C4 alkyl. 14. The method of claim 13, wherein the agent is selected from tris[3-(3,4-dicarboxyphenoxy)phenyl]phosphine oxide trianhydride or tris[4-(3,4-dicarboxyphenoxy)phenyl]phosphine oxide trianhydride. 15. The method of claim 8, wherein W is N, wherein Ar is a phenyleneoxy group (—OPh-) that is para- or meta-substituted with respect to oxygen, and wherein the agent is further defined by a general formula (VI): Z—(—OPh-)3—N. 16. The method of claim 15, wherein Z is a phthalic anhydride group that is connected to the phenyleneoxy group through an ether bond, and wherein the agent is further defined by a general formula (VII): wherein R1 through R8 are independently selected from H or C1-C4 alkyl. 17. The method of claim 16, wherein the agent is selected from tris[3-(3,4-dicarboxyphenoxy)phenyl]amine trianhydride or tris[4-(3,4-dicarboxyphenoxy)phenyl]amine trianhydride. 18. The method of claim 8, wherein W is N, wherein Z and Ar in combination form a phthalic anhydride moiety that is directly bonded to N, and wherein the agent is further defined by a general formula (VIII): wherein R9 to R11 are independently selected from H or C1-C4 alkyl.
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