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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Results 1-3 of 21
Page 77
... entropy of mixing , which decreases with molecular weight , does not compensate then the elastic energy of deformation involved in the swelling of the network . This is observed in the presence networks in presence of a solvent ( 14 ) ...
... entropy of mixing , which decreases with molecular weight , does not compensate then the elastic energy of deformation involved in the swelling of the network . This is observed in the presence networks in presence of a solvent ( 14 ) ...
Page 112
... entropy : ESA2 ( E > 0 ) is the decrement in the elastic entropy caused by the chain segments enhanced propensity to align in the direction of the uniaxial orienta- tional field ; ES / 2X is the corresponding effect in the perpendicular ...
... entropy : ESA2 ( E > 0 ) is the decrement in the elastic entropy caused by the chain segments enhanced propensity to align in the direction of the uniaxial orienta- tional field ; ES / 2X is the corresponding effect in the perpendicular ...
Page 171
... entropy residing in the chains and not in the crosslinks . This underestimates the entropy of the network by a factor of 2. In more general theories , such as in that of James and Guth [ 10 ] half of the entropy can be ascribed to the ...
... entropy residing in the chains and not in the crosslinks . This underestimates the entropy of the network by a factor of 2. In more general theories , such as in that of James and Guth [ 10 ] half of the entropy can be ascribed to the ...
Contents
Remarks | 2 |
Statistical Mechanics of dDimensional Polymer Networks and Exact | 17 |
FluctuationInduced Deformation Dependence of the FloryHuggins | 35 |
Copyright | |
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42 Editors anisotropy Basis of Polymer Bastide Baumgärtner and C.E. behaviour C.E. Picot Molecular calculated carrageenan chain segments Chem chemical chemical potential conformation constraints corresponding crosslinking curves deformation density deswelling deuterated distribution dynamics 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 Heidelberg 1989 Herz interaction parameter isotropic labelled paths length linear Macromolecules macroscopic melt modulus molecular weight monomers network chains Networks Springer-Verlag Berlin neutron scattering observed obtained P.G. de Gennes PDMS chains phantom network Phys Picot Molecular Basis polybutadiene polyelectrolyte Polymer Networks Springer-Verlag polymeric fractals Proceedings in Physics radius of gyration ratio relaxation sample scaling solution solvent Springer Proceedings star molecules structure swelling swollen temperature theory topological uniaxial values vector viscoelastic viscosity volume fraction