DESIGN, PREPARATION AND CHARACTERIZATION OF BIOLOGICAL AUXETIC HYDROGELS WITH SHELL-CORE STRUCTURE

摘要

The biological auxetic hydrogels can be used in the wide field of biomedical materials. However, there are few researches about preparation and properties of this kind of materials. According to the structures of auxetic molecular materials and composite materials which have already exhibited the negative Poisson's ratio effect, a kind of novel hydrogels with shell-core structure were designed and prepared. The deformation of the hydrogels under compressing was tested by the Digital Speckle Correlation Method (DSCM), and their displacements and Poisson's ratios were characterized. For the compressed hydrogels with shell-core structure, because of the asynchronous deformation between core and shell part, the middle area of the sample appeared concave shrink. The core's diameter had important influence on the deformation and Poisson's ratio of the samples.