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    Wyświetlanie 1-10 z 10
    Tytuł:
    Free-Volume and Tensile Properties of Glass Fibre Reinforced Polyamide 6 Composites
    Autorzy:
    Dryzek, E.
    Wróbel, M.
    Juszyńska-Gałązka, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033894.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    61.41.+e
    Opis:
    The tensile properties and free volume of commercially available modified polyamid 6 and polyamid 6 composites with 15 and 30 wt% of glass fibre were the subject of the studies. The tensile test allowed us to obtain the stress-strain curves and determine the tensile properties of the polyamid 6 samples. The positron lifetime measurements were performed for the samples before the test and for the samples in the vicinity of the break after they failed. The composites exhibited slightly lower values of the ortho-positronium lifetime and therefore smaller size of the local free volumes in comparison to polyamid 6 without reinforcement. The analysis of the positron lifetime spectra indicated size distribution of the free volume. The initially narrower distributions for the composite samples became broader as a result of the deformation. The deformation caused also increase of the ortho-positronium intensity in the obtained positron lifetime spectra.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1501-1505
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron Annihilation Lifetime Spectroscopy of ABS Objects Manufactured by Fused Deposition Modelling
    Autorzy:
    Dryzek, M.
    Dryzek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033901.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    61.41.+e
    Opis:
    Positron annihilation lifetime spectroscopy was used to study acrylonitrile butadiene styrene (ABS) specimens manufactured using fused deposition modelling to explore possibilities of identifying differences in molecular structure. The set of specimens was prepared including square tiles and long rectangular tiles (100 mm and 200 mm long) with all filament roads parallel to the longer edge. All types of tiles were produced with various infill line distance parameter resulting in different overlapping of the roads in horizontal and vertical directions. The slight increase of the ortho-positronium lifetime indicating increase of the mean free volume radius was observed for the longest tiles for which influence of weld interface is expected to be most pronounced. No differences were observed for different infill line distance parameters.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1506-1508
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Outdoor Ageing of an Ethylene-Propylene Copolymer: A Positron Annihilation Study
    Autorzy:
    Consolati, G.
    Quasso, F.
    Gallo, R.
    Severini, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043322.pdf
    Data publikacji:
    2005-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.41.+e
    78.70.Bj
    81.05.Lg
    Opis:
    An investigation on the environmental degradation of an ethylene-propylene copolymer was carried out through positron annihilation lifetime spectroscopy, density and differential scanning calorimetry measurements. Polymer sheets were exposed to sunlight up to 11000 hours. Density and melting enthalpy increase with ageing, while ortho-positronium intensity decreases; ortho-positronium lifetime does not show significant variations up to 4400 hours. At higher exposures it starts to decrease. Outdoor ageing produces an increased crystallinity of the copolymer; also a degradation occurs with formation of carbonyl groups. The corresponding Ps inhibition is the main reason for the decrease in ortho-positronium intensity, the other one being the reduced amount of the amorphous phase available. The lifetime decrease observed at the highest exposures can be interpreted in terms of a shrinking of the nanoholes trapping positronium.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 5; 805-810
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron Annihilation Lifetime in situ Study of Deformed Polyolefin Elastomers
    Autorzy:
    Krzemień, K.
    Kansy, J.
    Frąckowiak, J. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043338.pdf
    Data publikacji:
    2005-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    71.60.+z
    61.41.+e
    Opis:
    The positron annihilation lifetime spectroscopy was used to investigate the free volume hole size of ethylene octane copolymers as a function of deformation in the range from 0 to 110% in steps of 10%. For each degree of deformation a series of 5-6 positron annihilation lifetime spectra was collected in situ. All spectra of a given series were analysed simultaneously. They were resolved into three exponential components, of lifetimes parameters τ$\text{}_{i}$ and intensities I$\text{}_{i}$. The variations of τ$\text{}_{3}$ reflect three deformation regions, the elastic range, strain softening range, and plastic region.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 5; 837-841
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron Lifetime in Hostaphan
    Autorzy:
    Kostrzewa, M.
    Bujnarowski, G.
    Kluza, A. A.
    Szuszkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047137.pdf
    Data publikacji:
    2006-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    71.60.+z
    61.41.+e
    Opis:
    Positron lifetime measurements in hostaphan RNK, used for encapsulation of $\text{}^{22}$Na positron sources, were performed. It was found that the parameter of positron lifetime spectra in hostaphan RNK differ markedly from those for other forms of polyethylene terephthalate. The maximum penetration depth of positrons from RNK hostaphan amounts 0.42 mm. The information gained in the present study is of great importance for experimenters using hostaphan RNK for encapsulation of positron sources.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 5; 615-620
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlations between Positron Annihilation Parameters and Macroscopic Properties in Copolymers Belonging to Elastomers Group
    Autorzy:
    Krzemień, K.
    Kansy, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812536.pdf
    Data publikacji:
    2008-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    71.60.+z
    61.41.+e
    Opis:
    The positron annihilation lifetime spectroscopy was used to study correlations between positron annihilation parameters and macroscopic properties in two kinds of polymers from elastomers group. Two kinds of material were investigated: three samples of ethylene octane copolymers (commercial name engage) of different densities and six samples of polybutylene terephtalate-polyether glycol copolymers (hytrel) having different densities. A correlation between intensity of ortho-positronium component and the density (d) of samples was observed for both kinds of material. From the ortho-positronium pick-off lifetime the mean radii (R) of free volume centers were determined. A good linear correlation between R and d was found.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 5; 1435-1440
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Free-Volume Studies in Polycaprolactone/Poly(propylene oxide) Urethane/Urea Membranes by Positron Lifetime Spectroscopy
    Autorzy:
    Ferreira Marques, M.
    Gordo, P.
    de Lima, A.
    Queiroz, D.
    Norberta de Pinho, M.
    Major, P.
    Kajcsos, Zs.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812490.pdf
    Data publikacji:
    2008-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.41.+e
    78.70.Bj
    82.30.Gg
    Opis:
    Positron annihilation lifetime spectroscopy was used to study the free volume parameters in polypropylene oxide-based tri-isocyanate terminated prepolymer/polycaprolactone diol bi-soft urethane/urea membranes (PU/PCL) with PCL content from 5 up to 25 wt%. Positron annihilation lifetime spectroscopy measurements carried out in the temperature range 298-324 K mirrored the phase separation of the various soft and hard segments present in the membranes. The size and amount of free volume holes determined by positron annihilation lifetime spectroscopy appear to be correlated with the $CO_2$ gas permeability through the membranes.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 5; 1359-1364
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polypropylene Films Studied with Variable Positron Beams
    Autorzy:
    Dębowska, M.
    Coleman, P. G.
    Gidley, D. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2007958.pdf
    Data publikacji:
    1999-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.10.Dr
    61.41.+e
    71.60.+z
    78.70.Bj
    Opis:
    Doppler broadening and positron lifetime spectra have been measured for polypropylene films of constant thickness (≈ 50 μm) and different morphology that crystallized from melt at temperature 0, 100, and 120°C. The S -parameter vs. energy curves do not change in a systematic way with crystallinity of samples. It is supposed that decrease in the fractional free volume for samples of greater crystallinity is not seen in S-values because of their increase resulting from annihilation in defects present both in the crystalline regions and on the lamellae surfaces. Intensities of the components in the positron lifetime spectra: I$\text{}_{2}$ (τ$\text{}_{2}$=1.3 ns) and I$\text{}_{3}$ (τ$\text{}_{3}$≈ 2.3÷2.8 ns) show changes with crystallinity of samples. The evident trend is observed for the longer-lived τ$\text{}_{3}$-component intensity to decrease with crystallinity while the reverse is true for the shorter, fixed τ$\text{}_{2}$-component. The decrease in the intensity of the longer-lived component can result from reduction of the fractional free volume.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 4; 496-504
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vapour Absorption in Melamine-Formaldehyde Resin
    Autorzy:
    Wawryszczuk, J.
    Ciesielski, K.
    Goworek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2025738.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    36.10.Dr
    61.41.+e
    66.30.-h
    Opis:
    The effects of vapour absorption on positron annihilation in cross-linked polymer were investigated. Contrary to linear polymers, absorption of vapour in cross-linked resin leads to the shortening of o-Ps lifetime. In vacuum absorbed molecules diffuse out. At room temperature desorption of hexane and hexanol is not complete; full elimination of absorbed molecules requires sample temperature increase.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 3-4; 523-528
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local Rigidity as a Criterion of Gas Permeation of Polymer and Composition Materials; PAL and TSL Experiments
    Autorzy:
    Shantarovich, V.
    Gustov, V.
    Belousova, E.
    Polyakova, A.
    Bekeshev, V.
    Kevdina, I.
    Yampolskii, Yu.
    Pastukhov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1196455.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.41.+e
    61.43.Fs
    68.43.Vx
    78.70.Bj
    82.35.Lr
    Opis:
    Various commercial and industrial properties of polymeric materials can be developed by the way of purposeful synthesis. For example, there are polymeric materials of extremely developed intrinsic microporosity. In attempts to further develop membrane properties (permeability and selectivity), the researchers artificially increase the pore sizes by various external influences, such as plastification by saturation of polymers with gases, sometimes in supercritical state, filling of a polymer with some non-organic components (zeolites). Sometimes, porosity of the composition appears to become higher than that of the components. This porosity, in difference with intrinsic one, can be called externally affected. The reason of these phenomena is not always clear, and in order to get some ideas in this field we suggest an experimental study using a combination of the two genetically interconnected (by spur processes) methods: positron annihilation lifetime spectroscopy and thermostimulated luminescence. This paper summarizes recently published and completely new results of the authors in order to illustrate the benefits of this experimental approach.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 806-811
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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