【摘 要】
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Shape memory polymers materials that can be deformed and fixed into temporary shapes,which can recover to the original,permanent shape upon proper external
【机 构】
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StateKeyLaboratoryofChemicalEngineering,DepartmentofChemicalandBiologicalEngineering,ZhejiangUnivers
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Shape memory polymers materials that can be deformed and fixed into temporary shapes,which can recover to the original,permanent shape upon proper external stimulus.Such property endues them with a variety of applications from aerospace technologies to intelligent medical devices.However,traditional programming methods in a shape memory circle are limited in singe axial and biaxial stretching.Here we propose a novel way to fix temporary shapes through lyophilization of PEG hydrogels those provide melting temperature around 50 ℃ at the dry state.The freeze-dried materials showed macroporous structure,and after heating,the materials shrunk on all the three dimensions achieving a non-porous structure.These non-porous shrunken materials can swell in water to form PEG hydrogels again.Therefore,the lyophilization procedure can be recognized as a triaxial stretching programming method which can be repeatedly performed.Effect of feed compositions and freezing conditions on the pore structure was studied.In addition,a pore-structure-memory effect was also discovered,showing that the freezing operation for the first time of the hydrogels will be recorded and memorized.
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