The Experts below are selected from a list of 9339 Experts worldwide ranked by ideXlab platform

Stanley Pau - One of the best experts on this subject based on the ideXlab platform.

W. Wenig - One of the best experts on this subject based on the ideXlab platform.

  • Ageing effects during isothermal crystallization of polypropylene blended with elastomers
    Journal of Materials Science, 1994
    Co-Authors: W. Wenig
    Abstract:

    The secondary crystallization of isotactic polypropylene in its blend with the elastomers ethylene-propylene-diene-terpolymer (EPDM) and trans-polyoctenylene (TOR), which occurs during isothermal crystallization, has been measured by time-dependent recording of X-ray wide-angle scattering. From the results, Avrami exponents were determined, which show that secondary crystallization takes place primarily within the already formed spherulites. Avrami exponents of the primary crystallization have been determined by the same method and also by observation of the spherulitic growth in the Polarization Microscope. It was found that both elastomers have different effects on the crystallization behaviour of the polypropylene.

  • Interactions between the components in isotactic polypropylene blended with EPDM
    Colloid and Polymer Science, 1993
    Co-Authors: W. Wenig, A. Wasiak
    Abstract:

    The interaction of isotactic polypropylene with ethylene propylene diene terpolymer in their blends has been investigated by use of differential scanning calorimetry, dynamic mechanical analysis, wide- and small-angle x-ray scattering, and by investigating the nucleation and kinetics of crystallization of the iPP component under the Polarization Microscope. It is found, that the dispersion of the EPDM component in the iPP matrix is dependent on blend composition and is maximal at 10% EPDM content. An interface layer between the two components is formed by migration of iPP molecules into the EPDM phase. A model for this interface is proposed.

Rudolf Oldenbourg - One of the best experts on this subject based on the ideXlab platform.

  • multifocus Polarization Microscope mf polscope for 3d Polarization imaging of up to 25 focal planes simultaneously
    Optics Express, 2015
    Co-Authors: Sara Abrahamsson, Molly Mcquilken, Shalin B Mehta, Amitabh Verma, Johannes Larsch, Rob Ilic, Rainer Heintzmann, Cornelia I Bargmann, Amy S Gladfelter, Rudolf Oldenbourg
    Abstract:

    We have developed an imaging system for 3D time-lapse Polarization microscopy of living biological samples. Polarization imaging reveals the position, alignment and orientation of submicroscopic features in label-free as well as fluorescently labeled specimens. Optical anisotropies are calculated from a series of images where the sample is illuminated by light of different Polarization states. Due to the number of images necessary to collect both multiple Polarization states and multiple focal planes, 3D Polarization imaging is most often prohibitively slow. Our MF-PolScope system employs multifocus optics to form an instantaneous 3D image of up to 25 simultaneous focal-planes. We describe this optical system and show examples of 3D multi-focus Polarization imaging of biological samples, including a protein assembly study in budding yeast cells.

Weiliang Hsu - One of the best experts on this subject based on the ideXlab platform.

Kenichi Takemura - One of the best experts on this subject based on the ideXlab platform.

  • The Effect Of Crystallinity On The Mechanical Properties Of Plain Woven Carbon Fiber Reinforced Polypropylene
    WIT Transactions on State-of-the-art in Science and Engineering, 2015
    Co-Authors: Hideaki Katogi, Kenichi Takemura
    Abstract:

    In this study, the effect of crystallinity on the mechanical properties of carbon fiber reinforced thermoplastics (CFRTP) was investigated. Plain woven carbon fiber was used as reinforcement. Polypropylene (PP) and maleic anhydride modified polypropylene (MAPP) were used as matrix materials. The crystallinity of PP was controlled by heat treatment after hot press molding of CFRTP. The range of crystallinity of PP and MAPP were from 26% to 40%. Flexural and izod impact tests were conducted on CFRTP based on Japanese Industrial Standard (JIS) K 7074 and K 7110, respectively. Also, double-notched tests were conducted on CFRTP specimens. The crystal morphologies of single carbon fiber added thermoplastics were observed using a Polarization Microscope. As a result, the flexural strength and izod impact values of CFRTP using PP increased with an increase of crystallinity. The flexural strength and izod impact values of CFRTP using MAPP barely changed with an increase of crystallinity. However, the interfacial shear strength of CFRTP using MAPP increased with an increase of crystallinity. Crystallizations of PP and MAPP occurred around the carbon fiber after heat treatment. As a result, interfacial adhesion between fiber and resin increased with an increase of crystallinity.

  • The effect of crystallinity on the mechanical properties of plain woven carbon reinforced composites using polypropylene
    WIT Transactions on the Built Environment, 2014
    Co-Authors: Hideaki Katogi, Kenichi Takemura
    Abstract:

    In this study, the effect of crystallinity on the mechanical properties of carbon fiber reinforced thermoplastics (CFRTP) was investigated. Plain woven carbon fiber was used as reinforcement. Polypropylene (PP) and maleic anhydride modified polypropylene (MAPP) were used as a matrix. The crystallinity of PP was controlled by using heat treatment after hot press molding of CFRTP. The range of crystallinity of PP and MAPP were from 26% to 40%. Flexural and izod impact tests of CFRTP were conducted based on Japanese Industrial Standard (JIS) K 7074 and K 7110, respectively. And double-notched test of CFRTP was conducted. Crystal morphologies of single carbon fiber added thermoplastics were observed by using Polarization Microscope. As a result, flexural strength and izod impact the value of CFRTP using PP increased with an increase of crystallinity. Flexural strength and izod impact value of CFRTP using MAPP almost did not change with an increase of crystallinity. But interfacial shear strength of CFRTP using MAPP increased with an increase of crystallinity. Crystallizations of PP and MAPP occurred around carbon fiber after heat treatment. Therefore, interfacial adhesion between fiber and resin increased with an increase of crystallinity.