The Experts below are selected from a list of 1035 Experts worldwide ranked by ideXlab platform

Akio Teramoto - One of the best experts on this subject based on the ideXlab platform.

  • entanglement effects in semiflexible Polymer solutions 2 huggins coefficient and inclusion of intermolecular hydrodynamic interactions
    Macromolecules, 1998
    Co-Authors: Takahiro Sato, Atsuyuki Ohshima, Akio Teramoto
    Abstract:

    A previously proposed viscosity equation for Stiff-Chain Polymer solutions based on the fuzzy cylinder model theory was modified by incorporating empirically the effect of intermolecular hydrodynamic interaction (HI). The Huggins coefficient k derived from the modified viscosity equation consists of the contributions of the entanglement interaction (kEI) and of the intermolecular HI (kHI). While the former can be calculated using the fuzzy cylinder model theory, the latter remains as an adjustable parameter. For various Stiff-Chain Polymer solutions, kHI was estimated by subtracting the calculated kEI from experimental k. The results for dichloromethane (DCM) solutions of poly(n-hexyl isocyanate) (PHIC) showed that kHI is much smaller than kEI at 1 N 10, where N is the number of Kuhn's statistical segments per molecule, but becomes important outside the above N range. Zero-shear viscosities calculated by the modified viscosity equation for concentrated DCM solutions of PHIC were favorably compared with ex...

Takahiro Sato - One of the best experts on this subject based on the ideXlab platform.

  • entanglement effects in semiflexible Polymer solutions 2 huggins coefficient and inclusion of intermolecular hydrodynamic interactions
    Macromolecules, 1998
    Co-Authors: Takahiro Sato, Atsuyuki Ohshima, Akio Teramoto
    Abstract:

    A previously proposed viscosity equation for Stiff-Chain Polymer solutions based on the fuzzy cylinder model theory was modified by incorporating empirically the effect of intermolecular hydrodynamic interaction (HI). The Huggins coefficient k derived from the modified viscosity equation consists of the contributions of the entanglement interaction (kEI) and of the intermolecular HI (kHI). While the former can be calculated using the fuzzy cylinder model theory, the latter remains as an adjustable parameter. For various Stiff-Chain Polymer solutions, kHI was estimated by subtracting the calculated kEI from experimental k. The results for dichloromethane (DCM) solutions of poly(n-hexyl isocyanate) (PHIC) showed that kHI is much smaller than kEI at 1 N 10, where N is the number of Kuhn's statistical segments per molecule, but becomes important outside the above N range. Zero-shear viscosities calculated by the modified viscosity equation for concentrated DCM solutions of PHIC were favorably compared with ex...

Baltá Calleja, Francisco José - One of the best experts on this subject based on the ideXlab platform.

  • Precursors of crystallization via density fluctuations in Stiff-Chain Polymers
    'American Physical Society (APS)', 2020
    Co-Authors: Ezquerra, Tiberio A., López-cabarcos E., Hsiao B.s., Baltá Calleja, Francisco José
    Abstract:

    4 pags., 5 figs. -- PACS number~s!: 82.35.1t, 61.10.Eq, 64.70.PfThe ordering process just before cold crystallization for a Stiff-Chain Polymer is studied by means of simultaneous real time wide- and small-angle x-ray scattering and dielectric spectroscopy techniques. The kinetics of the ordering process prior to crystallization is described by the spinodal decomposition formalism. From wide-angle x-ray scattering measurements it is confirmed that no crystalline order takes place during the induction period. The dielectric study of the α relaxation suggests that during this induction period there is not a major restriction of segmental motions of Polymer Chain segments.The authors are indebted to the DGICYT (Grant No. PB 94-0049), Spain, and to NEDO’s International Joint Research Program, Japan, for generous support of this investigation. Measurements at HASYLAB (Hamburg, F.R.G.) have been funded by the program Human Capital and Mobility, Access to Large Installations EC

Atsuyuki Ohshima - One of the best experts on this subject based on the ideXlab platform.

  • entanglement effects in semiflexible Polymer solutions 2 huggins coefficient and inclusion of intermolecular hydrodynamic interactions
    Macromolecules, 1998
    Co-Authors: Takahiro Sato, Atsuyuki Ohshima, Akio Teramoto
    Abstract:

    A previously proposed viscosity equation for Stiff-Chain Polymer solutions based on the fuzzy cylinder model theory was modified by incorporating empirically the effect of intermolecular hydrodynamic interaction (HI). The Huggins coefficient k derived from the modified viscosity equation consists of the contributions of the entanglement interaction (kEI) and of the intermolecular HI (kHI). While the former can be calculated using the fuzzy cylinder model theory, the latter remains as an adjustable parameter. For various Stiff-Chain Polymer solutions, kHI was estimated by subtracting the calculated kEI from experimental k. The results for dichloromethane (DCM) solutions of poly(n-hexyl isocyanate) (PHIC) showed that kHI is much smaller than kEI at 1 N 10, where N is the number of Kuhn's statistical segments per molecule, but becomes important outside the above N range. Zero-shear viscosities calculated by the modified viscosity equation for concentrated DCM solutions of PHIC were favorably compared with ex...

Ezquerra, Tiberio A. - One of the best experts on this subject based on the ideXlab platform.

  • Precursors of crystallization via density fluctuations in Stiff-Chain Polymers
    'American Physical Society (APS)', 2020
    Co-Authors: Ezquerra, Tiberio A., López-cabarcos E., Hsiao B.s., Baltá Calleja, Francisco José
    Abstract:

    4 pags., 5 figs. -- PACS number~s!: 82.35.1t, 61.10.Eq, 64.70.PfThe ordering process just before cold crystallization for a Stiff-Chain Polymer is studied by means of simultaneous real time wide- and small-angle x-ray scattering and dielectric spectroscopy techniques. The kinetics of the ordering process prior to crystallization is described by the spinodal decomposition formalism. From wide-angle x-ray scattering measurements it is confirmed that no crystalline order takes place during the induction period. The dielectric study of the α relaxation suggests that during this induction period there is not a major restriction of segmental motions of Polymer Chain segments.The authors are indebted to the DGICYT (Grant No. PB 94-0049), Spain, and to NEDO’s International Joint Research Program, Japan, for generous support of this investigation. Measurements at HASYLAB (Hamburg, F.R.G.) have been funded by the program Human Capital and Mobility, Access to Large Installations EC