Polymer Motion in Dense Systems: Proceedings of the Workshop, Grenoble, France, September 23â25, 1987Dieter Richter, Tasso Springer The nine review articles and roughly 30 contributed papers contained in this volume survey the present understanding of the molecular motion of polymers in concentrated solutions, melts and the amorphous state. Although the main emphasis is on results from neutron scattering experiments, about half of the contributions relate to complementary techniques such as light scattering and NMR. The book highlights three areas of active reseach that have received increasing attention in recent years. First, work on polymer relaxation near the glass transition and in glassy systems has shown that the application of different experimental techniques is indispensable due to the broad range of time scales over which these phenomena occur on a molecular level. Second, it is reported that the internal Brownian motion of long chain molecules and their diffusion in an entangled environment still does not have a generally accepted physical picture, although detailed insights into the microscopic motion have been obtained. Third, important progress has been made in unravelling the characteristics of phase separation of polymer blends, in which modifications to the ordinary laws of diffusion are of particular interest. |
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Page 61
... wave - vector . Therefore the time of flight spectra give the frequency distribution of these modes integrated over all possible moduli and directions of the wave vectors in the first Brillouin zone . Especially if those modes exhibit a ...
... wave - vector . Therefore the time of flight spectra give the frequency distribution of these modes integrated over all possible moduli and directions of the wave vectors in the first Brillouin zone . Especially if those modes exhibit a ...
Page 235
... wave vector q < 0.1 A for polydimethylsiloxane ) and the deviation from universal behaviour with in- creasing q could be described by incorporating the local rigidity of the polymer chain into the Rouse model . Unfortunately the ...
... wave vector q < 0.1 A for polydimethylsiloxane ) and the deviation from universal behaviour with in- creasing q could be described by incorporating the local rigidity of the polymer chain into the Rouse model . Unfortunately the ...
Page 246
... waves with wave vector q , which become excited by random thermal forces and decay with characteristic relaxation times . The mean squared amplitudes of the concen- tration waves depend on q and are directly reflected in a scattering ...
... waves with wave vector q , which become excited by random thermal forces and decay with characteristic relaxation times . The mean squared amplitudes of the concen- tration waves depend on q and are directly reflected in a scattering ...
Contents
Local Motions in Bulk Polymers By L Monnerie J L Viovy | 18 |
By T A Vilgis With 1 Figure | 26 |
By H Sillescu With 4 Figures | 37 |
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anisotropic anisotropy autocorrelation function behaviour calculated Chem components concentration fluctuations constraints copolymer correlation function corresponding crosslinking curve decay deformation density described deuterated diffusion coefficient dynamic light scattering dynamics effect elastic energy entanglement equation experimental Figure frequency friction Fytas glass transition incoherent incoherent scattering isotropic labelled chains lattice Lett light scattering linear lineshape Macromolecules matrix measurements mesh modes molecular weight molecules monomer motion mutual diffusion neutron scattering observed obtained orientation P.G. de Gennes PDMS Phys plot polybutadiene polymer blends polymer chain polymer melts polymeric polystyrene predicted protonated quasielastic quench radius of gyration range reptation model rods Rouse model rubber samples scale scattered intensity scattering experiments scattering function segments shows simulations small angle solution spectra spectrum spin spinodal decomposition structure factor Tâ techniques test chain theoretical theory tion tube values vector viscoelastic