Zobrazeno 1 - 10
of 116
pro vyhledávání: '"Walter H. Stockmayer"'
Publikováno v:
Journal of Polymer Science: Polymer Symposia. 46:149-159
Dielectric relaxation has been studied for poly (ϵ-caprolactone) in dioxane solution. As expected from the head-to-tail structure [-(CH2)5COO-]x, at a given temperature there are two distinct dielectric loss peaks. Radio-frequency bridge measurement
Publikováno v:
Journal of Polymer Science: Polymer Symposia. 71:95-100
Light-scattering and viscosity measurements are reported for fractions of poly(decamethylene perfluorosebacate). Intrinsic viscosity (dL/g) relationships at 25°C are [η] = 1.55 × 10−4Mv0.70 in chloroform and (η) = 8.8 × 10−4Mv0.50 in s-tetra
Publikováno v:
The Journal of Physical Chemistry B. 108:16168-16173
Several years ago Utracki and Simha reported a remarkable independence of molar mass of the ratio of the thermodynamic critical (consolute) concentration and the concentration of incipient coil overlap, also known as "critical" concentration. They in
Publikováno v:
Macromolecules. 33:3924-3931
Calculations based on an extended Flory−Huggins−Staverman model demonstrate that miscibility gaps in virtually immiscible blends may encompass a complex pattern of metastable and unstable equilibria that differ little in Gibbs free energy. Exampl
Autor:
Lester L. Weil, Walter H. Stockmayer
Publikováno v:
Polymer International. 44:221-224
Some early work on the sol–gel transition is recalled, including correspondence with P. J. Flory, the original data on effects of dilution on gel points in pentaerythritol–adipic acid polyesters, and previously unpublished observations of melt an
Publikováno v:
Macromolecular Symposia. 113:107-113
1H and 19F spin-lattice relaxation times and nuclear Overhauser enhancement factors are reported for solutions of poly(fluoromethylene) in DMSO, and for poly(vinyl fluoride) in DMF. These results, together with literature values for other fluorinated
Publikováno v:
Journal of Polymer Science Part B: Polymer Physics. 34:1005-1018
The dilute solution properties of copolymers are briefly discussed in relation to those of the parent homopolymers. It is shown that copolymer molecules are usually more expanded in solution than would be expected from the averaged behavior of the pu
Publikováno v:
Collection of Czechoslovak Chemical Communications. 60:1653-1660
The effects of polymolecularity on the second and third light-scattering virial coefficients are calculated for some sample distributions and compared to the values obtained from an approximate treatment by Burchard and coworkers. It is concluded tha
Publikováno v:
Macromolecules. 27:7429-7432
The low-frequency dielectric permittivity of a dioxane solution of poly(e-caprolactone) was reinvestigated at a lower concentration than in earlier work. The recalculated magnitude of the dipole-moment component parallel to the virtual bond in an est
Autor:
Walter H. Stockmayer, Fumihiko Tanaka
Publikováno v:
Macromolecular Symposia. 81:171-175
A molecular theory is presented for the thermodynamic properties of reversible gels whose junctions are formed by the clustering of an arbitrary number of associating groups, or segments, on the constituent molecules (or primary chains for polymeric