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Tough double network (DN) hydrogels are a kind of interpenetrating network (IPN) gels with a contrasting structure; they consist of a rigid and brittle 1st network with dilute, densely cross-linked short chains and a soft and ductile 2nd network with concentrated, loosely cross-linked long chains. In this work, we focus on how the brittle gel changes into a tough one by increasing the amount of ductile...
The data of the penetrating behavior of water into silk fibroin and of the softening behavior of the film by penetration has been reviewed on the basis of fractal conception. Two power laws have been obtained from the logarithmic plot for the data. A convenient fractal figure has been presented in order to interpret the power laws and the penetrating and softening behavior.
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