## Molecular Basis of Polymer Networks: Proceedings of the 5th IFF-ILL Workshop, Jülich, Fed. Rep. of Germany, October 5–7, 1988The 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 46

Page 133

A consequence of scaling theory is that the entropic

free energy is diminished ( 5 ) by a factor ... which varies as q1 / 4 , might be

expected to alter the free energy of the swollen network , and hence the

moduli .

A consequence of scaling theory is that the entropic

**elastic**contribution to thefree energy is diminished ( 5 ) by a factor ... which varies as q1 / 4 , might be

expected to alter the free energy of the swollen network , and hence the

**elastic**moduli .

Page 134

It follows that the

in the dry state as in the theta state . The molecular theory of rubber

gives for the

It follows that the

**elastic**part of the free energy of the individual coils is the samein the dry state as in the theta state . The molecular theory of rubber

**elasticity**( 8 ]gives for the

**elastic**free energy of a single coil ( sc ) Fel ( sc ) - 3kT ( a2 - 1 ) / 2 ...Page 135

The

the end - points of this superchain , Rs , is given by [ 8 ] Fel ( gel ) = 3kT ( 2 - 1 ) / 2

( 4 ) where B = Rs / Rso , and Rso is the nearest spatial neighbour distance ...

The

**elastic**free energy associated with the separation of the distance betweenthe end - points of this superchain , Rs , is given by [ 8 ] Fel ( gel ) = 3kT ( 2 - 1 ) / 2

( 4 ) where B = Rs / Rso , and Rso is the nearest spatial neighbour distance ...

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### Contents

Remarks | 2 |

By S F Edwards With 1 Figure | 17 |

FluctuationInduced Deformation Dependence of the FloryHuggins | 35 |

Copyright | |

14 other sections not shown

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Molecular Basis of Polymer Networks: Proceedings of the 5th IFF-ILL Workshop ... Artur Baumgärtner,Claude E. Picot No preview available - 2011 |

### Common terms and phrases

appear approximation arms assumed average behaviour bonds calculated chains Chem chemical compared concentration conformation connected considered constant constraints containing contribution correlations corresponding crosslinking curves deformation density dependence described deuterated dimension direction discussed distance distribution dynamics Editors effect elastic equation equilibrium expected experimental experiments exponent expression factor Figure finds Flory fluctuations force fractal fraction free energy function given gives increases interaction labelled larger length linear Macromolecules mean measurements mechanical melt method molecular weight molecules motion neutron Note observed obtained orientation parameter paths Phys Physics plot points Polymer Networks potential predictions present properties range rates ratio reduced reference relaxation respect rods rubber sample scaling scattering segment shown shows simulations solution solvent Springer star star molecules statistical stress structure studied surface swelling swollen temperature theory transition values volume