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    Wyświetlanie 1-4 z 4
    Tytuł:
    Properties of Confined Polymer Melts
    Autorzy:
    Sikorski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041818.pdf
    Data publikacji:
    2005-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.50.Ng
    36.20.Ey
    61.25.Hq
    Opis:
    Properties of simple models of confined linear polymer chains were studied by means of the Monte Carlo method. Model chains were built of united atoms (statistical segments) and embedded to a simple cubic lattice. Then polymers were put into a slit formed by two parallel impenetrable surfaces. Chain lengths were varied up to 800 segments and the density of the polymer melt was changed up to 0.5. A Metropolis-like sampling Monte Carlo algorithm was used to determine the static properties of this model. The influence of the size of the confinement, the polymer melt concentration and the chain length on the chain's size and the structure was studied. The universal behavior of all confined polymer linear chains under consideration was found and discussed.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 3; 443-450
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of Chirality in Gold Nanostructures with Second Harmonic Generation
    Autorzy:
    Valev, V.
    Silhanek, A.
    Gillijns, W.
    Moshchalkov, V.
    Verbiest, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791200.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Ky
    81.05.Xj
    78.67.Pt
    36.20.Ey
    Opis:
    We present the second harmonic generation - circular dichroism response from G-shaped gold nanostructures for P-polarized incoming light. By eliminating the contributions of anisotropy to the signal, an absolute measure of the second harmonic generation - circular dichroism is presented. The system of planar nanostructures is an excellent model for studying the correlation between optical properties and chiral morphology at the nanoscale. Samples with both enantiomorphs of the chiral pattern were prepared and, demonstrating the unambiguous presence of chirality, the second harmonic generation - circular dichroism response from two such samples was fitted simultaneously with a single set of fitting parameters.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 498-500
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular Dynamics in Cyclic Olefin Copolymer
    Autorzy:
    Makrocka-Rydzyk, M.
    Orozbaev, B.
    Nowaczyk, G.
    Głowinkowski, S.
    Jurga, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043644.pdf
    Data publikacji:
    2005-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.20.Ey
    76.60.-k
    77.22.Gm
    83.85.Vb
    82.35.Jk
    Opis:
    Nuclear magnetic resonance, broadband dielectric spectroscopy and dynamic-mechanical thermal analysis were employed to study molecular dynamics of ethylene-norbornene copolymer. The analysis of experimental data indicates existence of three motional processes denoted as αβ, andγ in order of decreasing temperature. Theα relaxation is related to the dynamic glass transition, while the β relaxation, observed only for the untreated sample, is assigned to short range segmental motions involving norbornene units. Theγ relaxation is due to very local motions of ethylene units e.g. trans-gauche isomerization, similar to those responsible forγ relaxation in polyethylene. The rate of motion accountable for γ process, follows the Vogel-Fulcher-Tammann equation, similarly to α transition, indicating cooperative nature of the motion.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 2; 385-393
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dependence of Order and Dynamics in Polymers and Elastomers under Deformation Revealed by NMR Techniques
    Autorzy:
    Stapf, S.
    Kariyo, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043553.pdf
    Data publikacji:
    2005-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Lg
    82.35.Lr
    76.60.-k
    61.25.Hq
    36.20.Ey
    81.40.Lm
    Opis:
    Uniaxial stretching and swelling are considered as two limiting cases of deformations of elastomers. Under both conditions, the molecular dynamics is changed with respect to the behavior that describes the undisturbed, equilibrium elastomer. Particularly the spectrum of segmental motions, which reveals itself in the frequency-dependence of the longitudinal NMR relaxation time, is discussed in this study, but also order effects expressed via the dipolar coupling strength are investigated. For stretched elastomers, a significant change of the relaxation dispersion is found for three different types of rubber; it is a consequence of a change of the mode spectrum of segmental motions that becomes obvious at low frequencies (below 1 MHz at room temperature). In swollen elastomers, on the other hand, a cross-over towards a behavior expected for semi-dilute solutions is found, and a comparison to solutions of uncross-linked polymers reveals a significant effect of the cross-links only in the kHz range. A much more pronounced difference between elastomers and polymer solutions, however, is found from double-quantum encoded NMR measurements where the residual order introduced by the presence of permanent cross-links is maintained even in the presence of solvent.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 2; 247-259
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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