Journal ArticleDOI
Structural Characteristics of Double Network Gels with Extremely High Mechanical Strength
Yang Ho Na,Takayuki Kurokawa,Yoshinori Katsuyama,Hiroyuki Tsukeshiba,Jian Ping Gong,Yoshihito Osada,Satoshi Okabe,Takeshi Karino,Mitsuhiro Shibayama +8 more
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Abstract:
The dynamic aspect of double network (DN) gels showing an extremely high mechanical strength has been investigated by dynamic light scattering (DLS) measurements The DN gels are formed from highly cross-linked poly(2-acrylamido-2-methylpropanesulfonic acid) (PAMPS) as the first network and loosely cross-linked (or non-cross-linked) polyacrylamide (PAAm) as the second network The results of DLS show that the presence of slow mode besides the gel mode (fast mode) enhances the strength of DN gels at the low cross-linking density of the second network The dynamics of the slow mode cannot be explained in terms of reptational motion of the second component in the first network, but it is similar to the translational motion of PAAm polymers in a semidilute solution A strong velocity dependence of the mechanical strength is observed at a shear rate close to the inverse of the relaxation time of the slow mode These results suggest that large “voids” of the first network may exist, and PAAm polymers that existread more
Citations
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Why are double network hydrogels so tough
TL;DR: In this article, double-network gels are characterized by a special network structure consisting of two types of polymer components with opposite physical natures: the minor component is abundantly crosslinked polyelectrolytes (rigid skeleton) and the major component comprises of poorly cross-linked neutral polymers (ductile substance).
Journal ArticleDOI
Hydrogels for Soft Machines
TL;DR: The recent development of strong hydrogels suggests that it may be possible to design new families of strong gels that would allow the design of soft biomimetic machines, which have not previously been possible.
Journal ArticleDOI
Multi-scale multi-mechanism design of tough hydrogels: building dissipation into stretchy networks
TL;DR: It is shown that tough hydrogels generally possess mechanisms to dissipate substantial mechanical energy but still maintain high elasticity under deformation, and a particularly promising strategy for the design is to implement multiple mechanisms across multiple length scales into nano-, micro-, meso-, and macro-structures of hydrogel.
Journal ArticleDOI
Super tough double network hydrogels and their application as biomaterials
TL;DR: The double network (DN) technique, developed by authors of as mentioned in this paper, provides an innovative and universal pass way to fabricate hydrogels with super high toughness comparable to rubbers.
Journal ArticleDOI
Fundamentals of double network hydrogels
TL;DR: This review strives to highlight the development and fundamentals of DN gels covering from preparation methods, network structures, to toughening mechanisms over the last decade to derive new design principles for the next-generation tough hydrogels.
References
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Journal ArticleDOI
Double‐Network Hydrogels with Extremely High Mechanical Strength
Journal ArticleDOI
Dynamic light scattering by non-ergodic media
P. N. Pusey,W. van Megen +1 more
TL;DR: In this article, the authors consider dynamic light scattering by non-ergodic media, such as glasses or gels, in which the scattering elements are able only to make limited Brownian excursions about fixed average positions.
Journal ArticleDOI
Spatial inhomogeneity and dynamic fluctuations of polymer gels
TL;DR: In this paper, the authors reviewed the recent developments of the structure investigation of polymer gels from both experimental and theoretical points of view, and showed that DLS becomes a powerful tool to distinguish the two contributions if it is coupled with ensemble averaging.
Journal ArticleDOI
Synthesis of hydrogels with extremely low surface friction.
Jian Ping Gong,Takayuki Kurokawa,Tetsuharu Narita,Go Kagata,Yoshihito Osada,Goro Nishimura,Masataka Kinjo +6 more
Journal ArticleDOI
Statistical physics of polymer gels
Sergei Panyukov,Yitzhak Rabin +1 more
TL;DR: In this article, the authors present a comprehensive analysis of the statistical mechanics of randomly cross-linked polymer gels, starting from a microscopic model of a network made of instantaneously crosslinked Gaussian chains with excluded volume, and ending with the derivation of explicit expressions for the thermodynamic functions and for the density correlation functions which can be tested by experiments.