The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform

Ko Okumura - One of the best experts on this subject based on the ideXlab platform.

  • Fracture of soft cellular solids?Case of non-crosslinked Polyethylene Foam
    EPL, 2020
    Co-Authors: Y Shiina, Yukari Hamamoto, Ko Okumura
    Abstract:

    Fracture mechanical properties of hard cellular solids (porous materials) with the Young modulus E larger than 3000 MPa have been well understood; scaling relations between fracture mechanical quantities and porosity are established, which can be explained by a theory based on the geometrical parameters of a cellular solid. In this study, we obtain experimentally the fracture energy of a very soft Polyethylene Foam with E around 1 MPa. We find scaling laws different from those for hard Foams, which can be understood by considerations independent of the structural parameters of Foams.

  • fracture of soft cellular solids case of non crosslinked Polyethylene Foam
    EPL, 2006
    Co-Authors: Y Shiina, Yukari Hamamoto, Ko Okumura
    Abstract:

    Fracture mechanical properties of hard cellular solids (porous materials) with the Young modulus E larger than 3000 MPa have been well understood; scaling relations between fracture mechanical quantities and porosity are established, which can be explained by a theory based on the geometrical parameters of a cellular solid. In this study, we obtain experimentally the fracture energy of a very soft Polyethylene Foam with E around 1 MPa. We find scaling laws different from those for hard Foams, which can be understood by considerations independent of the structural parameters of Foams.

Y Shiina - One of the best experts on this subject based on the ideXlab platform.

  • Fracture of soft cellular solids?Case of non-crosslinked Polyethylene Foam
    EPL, 2020
    Co-Authors: Y Shiina, Yukari Hamamoto, Ko Okumura
    Abstract:

    Fracture mechanical properties of hard cellular solids (porous materials) with the Young modulus E larger than 3000 MPa have been well understood; scaling relations between fracture mechanical quantities and porosity are established, which can be explained by a theory based on the geometrical parameters of a cellular solid. In this study, we obtain experimentally the fracture energy of a very soft Polyethylene Foam with E around 1 MPa. We find scaling laws different from those for hard Foams, which can be understood by considerations independent of the structural parameters of Foams.

  • fracture of soft cellular solids case of non crosslinked Polyethylene Foam
    EPL, 2006
    Co-Authors: Y Shiina, Yukari Hamamoto, Ko Okumura
    Abstract:

    Fracture mechanical properties of hard cellular solids (porous materials) with the Young modulus E larger than 3000 MPa have been well understood; scaling relations between fracture mechanical quantities and porosity are established, which can be explained by a theory based on the geometrical parameters of a cellular solid. In this study, we obtain experimentally the fracture energy of a very soft Polyethylene Foam with E around 1 MPa. We find scaling laws different from those for hard Foams, which can be understood by considerations independent of the structural parameters of Foams.

J A De Saja - One of the best experts on this subject based on the ideXlab platform.

  • anisotropic and heterogeneous thermal expansion of Polyethylene Foam blocks effect of thermal treatments
    European Polymer Journal, 2007
    Co-Authors: M A Rodriguezperez, J I Gonzalezpena, J A De Saja
    Abstract:

    Abstract Crosslinked closed cell Polyethylene Foams produced in blocks by compression moulding present an anisotropic and heterogeneous thermal expansion behaviour when the temperature is increased. This paper analyses the main reason for this particular behaviour and presents a way to reduce it by using thermal treatments. In order to perform this analysis, an experimental study on the cellular structure, lamellar distribution and thermal expansion is presented as a function of two kinds of thermal treatments. The experimental results have showed that the main factor controlling the Foams thermal expansion is an anisotropic and heterogeneous cellular structure of the original Foams. It has been also proved that an adequate thermal treatment allows homogenising the Foams thermal expansion.

  • Comparative study on the lamellar structure of Polyethylene Foams
    European Polymer Journal, 2005
    Co-Authors: Ovidio Almanza, J A De Saja, Miguel Angel Rodriguez-perez, B. Chernev, P. Zipper
    Abstract:

    A comparative study on the lamellar morphology of a collection of Polyethylene Foam (LDPE) has been performed in order to obtain a better understanding of the morphology of the crystalline phase of these materials. The lamellar structure was measured by small-angle X-ray scattering (SAXS), differential scanning calorimetric (DSC) and Raman spectroscopy. The results have shown that the lamellar structure of the Foams is different to that of a LDPE solid sheet. Moreover, the different sensitivity of the three experimental techniques to the lamellar structure has also been analyzed.

  • the thermal conductivity of a Polyethylene Foam block produced by a compression molding process
    Journal of Cellular Plastics, 2001
    Co-Authors: J A Martinezdiez, M A Rodriguezperez, J A De Saja, L Arcos O Y Rabago, Ovidio Almanza
    Abstract:

    The thermal conductivity of 10 mm thick low density Polyethylene Foam sheets cut from a block produced by a compression molding process has been studied in the temperature range between 24°C and 50°C. The cellular structure and the matrix polymer morphology have also been characterized to find out the main microscopic characteristics that influence on the Foam properties. A previously developed theoretical model has been applied to compute the thermal conductivity of the Foams under study. This model was successful in the considered temperature range. Moreover, the evolution of the thermal conductivity along the thickness of the Foam block has also been considered and explained in terms of the structure of the materials.

Yukari Hamamoto - One of the best experts on this subject based on the ideXlab platform.

  • Fracture of soft cellular solids?Case of non-crosslinked Polyethylene Foam
    EPL, 2020
    Co-Authors: Y Shiina, Yukari Hamamoto, Ko Okumura
    Abstract:

    Fracture mechanical properties of hard cellular solids (porous materials) with the Young modulus E larger than 3000 MPa have been well understood; scaling relations between fracture mechanical quantities and porosity are established, which can be explained by a theory based on the geometrical parameters of a cellular solid. In this study, we obtain experimentally the fracture energy of a very soft Polyethylene Foam with E around 1 MPa. We find scaling laws different from those for hard Foams, which can be understood by considerations independent of the structural parameters of Foams.

  • fracture of soft cellular solids case of non crosslinked Polyethylene Foam
    EPL, 2006
    Co-Authors: Y Shiina, Yukari Hamamoto, Ko Okumura
    Abstract:

    Fracture mechanical properties of hard cellular solids (porous materials) with the Young modulus E larger than 3000 MPa have been well understood; scaling relations between fracture mechanical quantities and porosity are established, which can be explained by a theory based on the geometrical parameters of a cellular solid. In this study, we obtain experimentally the fracture energy of a very soft Polyethylene Foam with E around 1 MPa. We find scaling laws different from those for hard Foams, which can be understood by considerations independent of the structural parameters of Foams.

D. D. Kale - One of the best experts on this subject based on the ideXlab platform.

  • Utilization of Pulverized Cross-linked Polyethylene Foam as Effective Filler for Linear Low-Density Polyethylene
    2020
    Co-Authors: Shashank T. Mhaske, Pravin G. Kadam, D. D. Kale
    Abstract:

    Cross-linked Polyethylene Foam (XPEF) is widely used in packaging and insulation applications. Since cross-linked polymer cannot be reprocessed similar to thermoplastics, utilization of these thermoset materials is an environmentally challenging problem. Due to thermoset nature, it can be used as filler or reinforcement in other base materials. Since cross-linked Polyethylene will have a better compatibility with polyolefin matrix, using waste cross-linked Polyethylene as filler in polyolefin material will be an attractive solution First, XPEF was crushed to particles with mesh size of about seven and was used as filler in linear low density Polyethylene (LLDPE) having 6.5 melt flow index. Concentration of waste cross-linked Foam powder was varied up to 40 phr in LLDPE matrix. Tensile, flexural, impact, vicat softening temperature, heat distortion temperature, scanning electron microscopy, and rheological properties were analyzed for the prepared compositions. Impact strength of LLDPE is found to have increased by 380% on 40 phr addition of the Foam powder in LLDPE matrix. Overall changes in mechanical properties are similar to cross-linked Polyethylene. From scanning electron microscope images, it became evident that the waste cross-linked Foam powder acted as a point of entanglement with different chains of LLDPE, giving physical cross-linking.

  • properties of high density Polyethylene filled with waste crosslinked Foam
    Journal of Applied Polymer Science, 2004
    Co-Authors: S M Tamboli, S T Mhaske, D. D. Kale
    Abstract:

    Crosslinked Polyethylene Foam is widely used in packaging and as an insulation material. Finely ground waste of such crosslinked Foam mesh size 7 or particle size less than 2815 μm is used as a filler in high-density Polyethylene (HDPE) of two different grades (7.5 and 21 MFI). Mechanical, thermal, and morphological properties of filled composites is studied experimentally. Waste Foam powder concentration was varied up to 40% by weight basis. Impact strength of base HDPE increased by a factor of six. The overall changes in mechanical properties are similar to the crosslinking effect. It is believed that waste Foam particles act as a point of entanglement with different chains of Polyethylene. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 110–114, 2004