Development of minimal models of the elastic properties of flexible and stiff polymer networks with permanent and thermoreversible cross-links
TLDR
This framework is then used to address how the network elasticity becomes modified when the network cross-linking is thermoreversible in nature, changes in the stability of the network with deformation, and the effect of a variable rate of network deformation on the non-linear elastic response.Abstract:
We review the elasticity of flexible and stiff polymer networks with permanent cross-links and synthesize these results into a unifying polymer chain network model. This framework is then used to address how the network elasticity becomes modified when the network cross-linking is thermoreversible in nature, changes in the stability of the network with deformation, and the effect of a variable rate of network deformation on the non-linear elastic response. Comparisons are made between this class of simplified network models with elasticity measurements performed on flexible chain and stiff fiber networks, both with permanent and associative cross-links. Although these network models are highly idealized, they are apparently able to capture many aspects of the elastic properties of diverse real networks.read more
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疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A
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The conundrum of gel formation by molecular nanofibers, wormlike micelles, and filamentous proteins: gelation without cross-links?
TL;DR: It is argued here that linear fibers can indeed form gels through their topological interactions alone, i.e., without cross-links, provided the fibers are sufficiently long (contour length much larger than cross-sectional size), sufficiently stiff (worm-like or rod-like) and temporally persistent, i,e., “unbreakable”.
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Molecular structure of self-healing polyampholyte hydrogels analyzed from tensile behaviors
TL;DR: The structure of the physical PA hydrogels is clarified from the tensile behaviors of the samples before and after the dialysis and the structural parameters of partial chains at a fixed observation time, including the Kuhn number, Kuhn length, and chain conformation are determined using the scaling theory.
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A tough act to follow: collagen hydrogel modifications to improve mechanical and growth factor loading capabilities
Stylianos Sarrigiannidis,J.M. Rey,Oana Dobre,Cristina González-García,Matthew J. Dalby,Manuel Salmerón-Sánchez +5 more
TL;DR: In this paper, the authors explored the ways in which these parameters, mechanical properties and growth factor (GF) delivery have been optimized in collagen hydrogel systems and examined their in vitro or in vivo biological effect.
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A research note: a mathematical model of crunchiness/crispness loss in breakfast cereals
TL;DR: In this paper, a sigmoid relationship between sensory crunchiness/crispness scores of five breakfast cereals and water activity was fitted with the model Y(aw) = Yo/{1 + exp [aw - awc)/b]}, where Y (aw) is the sensory score at a given aw level, Yo the score of the cereal at the dry (glassy) state, awc a critical water activity representing the inflection point of y(aw), and b a constant representing the steepness of Y(AW) in the aw region where
References
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疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A
TL;DR: PfPMP1）与感染红细胞、树突状组胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作�ly.
Journal ArticleDOI
Connection between polymer molecular weight, density, chain dimensions, and melt viscoelastic properties
TL;DR: In this article, it was found that the mean square unperturbed end-to-end distance 0, the density ρ and molecular weight M are related to the plabteau modulus, G 0, G N 0 ∞ { 0 ρ/M} 3, a finding in accord with that of Ronca.
Journal ArticleDOI
Nonlinear elasticity in biological gels.
Cornelis Storm,Cornelis Storm,Jennifer J. Pastore,Fred C. MacKintosh,Tom C. Lubensky,Paul A. Janmey +5 more
TL;DR: A molecular theory that accounts for strain-stiffening in a range of molecularly distinct gels formed from cytoskeletal and extracellular proteins and that reveals universal stress–strain relations at low to intermediate strains is reported.
Journal Article
Nonlinear Elasticity in Biological Gels
TL;DR: In this article, a simple molecular theory was proposed to account for strain stiffening in a wide range of molecularly distinct biopolymer gels formed from purified cytoskeletal and extracellular proteins.
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Large Elastic Deformations of Isotropic Materials. VII. Experiments on the Deformation of Rubber
R. S. Rivlin,D. W. Saunders +1 more
TL;DR: In this paper, it was shown that the load-deformation curves obtained for certain simple types of deformation of vulcanized rubber test-pieces in terms of a single stored energy function can be interpreted on the basis of the theory of large elastic deformations of incompressible isotropic materials.