Structure and elasticity of non-crystalline polymer networks

Dušek, Karel; Prins, W.

doi:10.1007/bfb0051042

Cited by 528 publications

(176 citation statements)

References 115 publications

Supporting

Mentioning

174

Contrasting

Order By: Relevance

“…This is consistent with the macroscopic, neoHookean behavior of PVA gels tested under similar conditions [17,18] and of lightly crosslinked, highly swollen gels in general [12,19]. Values of the Mooney-Rivlin fitting parameters B 1 and B 2 from fitting of the indentation data with Equation (14) are summarized in Table 2.…”

Section: Comparison Of the Model With Experimental Resultssupporting

confidence: 81%

Elasticity of rubber-like materials measured by AFM nanoindentation

Lin¹,

Dimitriadis²,

Horkay³

2007

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. We exploit the force spectroscopy capabilities of the atomic force microscope in characterizing the local elasticity of rubber-like materials. Extraction of elastic properties from force curves usually relies on the linear theory pioneered by Hertz. While the Hertzian force-indentation relationships have been shown to be accurate in modeling the contact mechanics at sufficiently shallow indentation depths, the linear deformation regime of the probed material is exceeded in many practical applications of nanoindentation. In this article, a simple, nonlinear force-indentation equation based on the Mooney-Rivlin model is derived and used to fit data from the indentation of lightly crosslinked poly(vinyl alcohol) gels in equilibrium with water. The extracted values of Young's modulus show good agreement with those obtained by both macroscopic compression testing and by fitting truncated portions of the force curves with the Hertz equation. Vol.1, No.9 (2007) [576][577][578][579][580][581][582][583][584] Available online at www.expresspolymlett.com DOI: 10.3144/expresspolymlett.2007.79 Figure 1. Schematics of the atomic force microscope (left) and indentation of the sample by the tip (right). Displacement control is achieved by moving the sample (as shown) or the cantilever base, usually with piezo tube actuators. Force is inferred from laser-based measurements of cantilever deflection d. The indentation depth δ is dependent on both d and the vertical displacement of the scanner (or the cantilever base) z. Keywords: mechanical properties, atomic force microscopy, polymer gels, indentation eXPRESS Polymer Letters

show abstract

Section: Comparison Of the Model With Experimental Resultssupporting

confidence: 81%

Elasticity of rubber-like materials measured by AFM nanoindentation

Lin¹,

Dimitriadis²,

Horkay³

2007

Express Polym. Lett.

View full text Add to dashboard Cite

show abstract

“…In such pre-networks, the existence of pendant vinyl groups is highly probable [19] but they are immobilized in compact structures and their protons produce very broad signals that disappear in the base line [7]. Therefore to determine PT, we have considered that, when a BA molecule reacts with the first vinyl group, ICH 2v and ICH v decrease as if two vinyl groups were consumed.…”

Section: Resultsmentioning

confidence: 99%

Polyacrylamide gels. Process of network formation

Baselga

Llorente²,

Hernández-Fuentes

et al. 1989

European Polymer Journal

View full text Add to dashboard Cite

This paper refers to the crosslinking copolymerization of acrylamide (AA or monomer-1) and N,N'-methylene-bisacrylamide (BA or monomer-2) in aqueous solution at 22 º , covering a broad range of comonomer concentrations. The extent of reaction, P T , the composition of the remaining comonomer mixture,fz, and the copolymer composition, F 2 , have been determined by high resolution 1 H-NMR with polymerization in situ. The non-linear regression fit of ¡;_ as a function of PT yields almost the same values for the reactivity ratios for any of the studied comonomers feeds. The instant copolymer composition changes with the copolymerization time due to a shift in the residual comonomer composition and, to a smaller extent, to changes in the comonomer relative reactivities. This effect contributes to the heterogeneity of the final network.

show abstract

“…As a result, inhomogeneities are created in polymer gels. 36,37 Because polymer chains are tied with chemical bonds, the concentration fluctuations cannot be released and remain as frozen inhomogeneities (that is, permanent concentration fluctuations). Bastide and Leibler 38 illustrated inhomogeneities in polymer gels with a mesh model, as shown in Figures 3a and b.…”

Section: Inhomogeneitiesmentioning

confidence: 99%

Small-angle neutron scattering on polymer gels: phase behavior, inhomogeneities and deformation mechanisms

Shibayama

2010

Polym J

198

139

View full text Add to dashboard Cite

Recent developments in small-angle neutron scattering (SANS) investigations on polymer gels are reviewed by encompassing (i) volume phase transition and microphase separation, (ii) inhomogeneities in polymer gels, (iii) pressure dependence of hydrophobic interaction and (iv) structural characterization of super-tough gels. These developments owe much to the understanding of gel inhomogeneities and advances in the precision analyses of SANS, such as the contrast variation method coupled with singular value decomposition and the accurate evaluation of incoherent scattering intensity. As one of the fruitful outcomes, deformation mechanisms in various types of super-tough gels are elucidated.

show abstract

Structure and elasticity of non-crystalline polymer networks

Cited by 528 publications

References 115 publications

Elasticity of rubber-like materials measured by AFM nanoindentation

Elasticity of rubber-like materials measured by AFM nanoindentation

Polyacrylamide gels. Process of network formation

Small-angle neutron scattering on polymer gels: phase behavior, inhomogeneities and deformation mechanisms

Contact Info

Product

Resources

About