Molecular Basis of Polymer Networks: Proceedings of the 5th IFF-ILL Workshop, Jülich, Fed. Rep. of Germany, October 5–7, 1988Artur Baumgärtner, Claude E. Picot The workshop on the "Molecular Basis of Polymer Networks", held October 5- 7, 1988 in 1iilich, FRG, continued a series of workshops jointly organized by the Institute Laue Langevin (ILL) in Grenoble, and the Institute of Solid State Physics of the KFA, 1iilich. The aim of this workshop was to provide a platform for discussions between theoreticians and experimentalists interested in the physics of polymer networks, in the hope that the two types of discussion would be synergistic. As revealed by the title of this workshop, the main focus of the lectures was on molecular aspects of the problem. The individual parts of these proceedings cover various approaches. Following quite general comments from a physicist examining the situation from "outside", various new theoretical concepts are developed. During the last decade the advent of Small Angle Neutron Scattering (SANS) has allowed the molecular structure of polymer networks to be studied and thus the reliability of the theories to be tested directly at the molecular level. Recent advances in this field are presented. The use of new techniques such as 2H NMR or QELS and the refinements of more classical, mechanical experimental measure ments have provided new information about the relation between the macroscopic behavior and the microscopic structure of polymer networks. Some recent results in this area are discussed for both chemically cross-linked networks and gels built by specific interchain interactions. |
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Page 135
... modulus Gy [ 9 ] , which measures the change in elastic free energy as a function of swelling . The volume modulus is given by N Fel = Gvp2 / 2 ( 5 ) where N is the number of superchains per unit volume , and is the volume fraction of ...
... modulus Gy [ 9 ] , which measures the change in elastic free energy as a function of swelling . The volume modulus is given by N Fel = Gvp2 / 2 ( 5 ) where N is the number of superchains per unit volume , and is the volume fraction of ...
Page 141
... modulus with increasing cross- linking density , G ' decreases in the case of the micronetworks.In all cases , G ' parallels G " over up to five decades . The moduli can be described by power laws G ' ~ G " ~ w where a increases from ...
... modulus with increasing cross- linking density , G ' decreases in the case of the micronetworks.In all cases , G ' parallels G " over up to five decades . The moduli can be described by power laws G ' ~ G " ~ w where a increases from ...
Page 167
... modulus is nearly zero but much lower than the loss modulus . At the gel point both moduli have the same value varying with frequency . The slope is approximately 0.5 over a range of 2.5 decades as has been found for chemical ...
... modulus is nearly zero but much lower than the loss modulus . At the gel point both moduli have the same value varying with frequency . The slope is approximately 0.5 over a range of 2.5 decades as has been found for chemical ...
Contents
Remarks | 2 |
The BaumgärtnerMuthukumar Effect in Networks | 11 |
Statistical Mechanics of dDimensional Polymer Networks and Exact | 17 |
Copyright | |
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anisotropy Basis of Polymer Bastide Baumgärtner behaviour calculated carrageenan chain segments Chem chemical chemical potential concentration conformation constraints corresponding crosslinking curves deformation density dependence deswelling deuterated distribution dynamics Editors Edwards effect elastic free energy elementary strand elongation entanglements entropy equation equilibrium excluded volume experimental experiments exponent factor Flory Flory-Huggins Flory-Huggins theory fluctuations fractal dimension free chains free energy Gaussian gelation Gennes helix Herz increases interaction parameter isotropic labelled paths length linear Macromolecules macroscopic measurements melt modulus Molecular Basis molecular weight monomers network chains neutron scattering observed obtained P.G. de Gennes PDMS chains phantom network Phys Picot polybutadiene polyelectrolyte Polymer Networks polymeric fractals Proceedings in Physics radius of gyration ratio relaxation Rouse model rubber elasticity sample scaling solution solvent Springer Proceedings star molecules structure swelling swollen temperature theory topological uniaxial values vector Vilgis viscoelastic volume fraction