The static scattering function is calculated for a cross-linked blend in the presence of a low molecular weight solvent. The idea suggested by de Gennes to treat analogously the effects of cross-links in a network and those of electric charges in a dielectric medium is generalized to include the concept of screening. It is argued that this generalization could help to resolve the discrepancy between the model and the neutron scattering data in the low q region. Other phenomena are also examined such as the enhancement of compatibility due to cross-links and the kinetics of the microphase separation transition.
We report measurements and analyses of cross sections up to 40 MeV for the reactions s9Y(p n~s 9Zr s9Y(p, 2n~ssZr, and s9Y(p,pn)ss Y obtained by the foil-act jvatjon method. The data are compared with other measurements and analyzed by the Hauser-Feshbach plus oneand two-step direct reactions. The analysis shows that Hauser-Feshbach plus one-step direct reaction is adequate to explain the data. The cross sections are also calculated with phenomenological preequilibrium models (exciton, hybrid, and geometry-dependent hybrid models), using global parameters. However, to get a good fit to the data with these phenomenological models, some adjustments of the global parameters were necessary. A discussion on the differences between the direct-reaction theory and preequilibrium models is given.
On montre que les théories standard de polymères continus, en bons solvants et en solvants 03B8, se renormalisent selon le schéma de des Cloizeaux (renormalisation multiplicative). On utilise pour cela l'équivalence de ces théories avec les théories du champ scalaire ~ à n composantes, en interactions ~4 ou ~6 avec lui-même, dans la limite où n s'annule, équivalence réalisée par la transformation de Laplace-de Gennes. On montre que la renormalisation dimensionnelle minimale de 't Hooft et Veltman est particulièrement bien adaptée au problème, car elle commute avec la transformation de Laplace-de Gennes. Abstract.-It is shown that standard continuous theories of polymers, in good and in 03B8 solvents, renormalize according to des Cloizeaux' scheme (multiplicative renormalization). Use is made of the equivalence of these theories, through Laplace-de Gennes transforms, with ~4 and ~6 self-interacting n component scalar field theories, in the limit of zero components. It is argued that the minimal dimensional renormalization procedure of 't Hooft and Veltman is particularly well adapted to the problem, since it commutes with Laplace-de Gennes transforms.
2014 Le rapport du rayon de giration à la distance carrée moyenne bout à bout pour une longue chaîne isolée est donné au second ordre en 03B5 = 4d, où d est la dimension de l'espace. Notre méthode de calcul est basée sur le concept de renormalisation directe introduit par J. des Cloizeaux. A trois dimensions (03B5 = 1), notre résultat peut être comparé au résultat numérique obtenu par C. Domb et F. F. Hioe.
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