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R&D Reports

vol. 2010 - I (2010.5.31 issue)

Polypropylene Compounds for Automotive Applications

Engineering plastics and metals have been extensively replaced by polypropylene (PP) based materials in automotive parts in order to achieve weight reductions and cost savings. To accomplish this, PP compounds which are made from PP and other components are under intense investigation. In this paper, we review the progress of research into compounding technology, improvement of mechanical properties and functionalization. Some problems and solutions for injection molding are also summarized. Furthermore, material developments for environmental load reduction are shown.
( 4~17 by Satoru MORITOMI,Tsuyoshi WATANABE,Susumu KANZAKI )

Development of Next Generation Organic Solar Cell

Organic photovoltaic, OPV, cells have been attracted much attention for next generation solar cells. OPV is based on the same technology as polymer light-emitting diodes, PLED, which has been developed intensively for TV application at Sumitomo Chemical Co., Ltd. Many PLED-related materials and device fabrication processes can accelerate the development of OPV technology. Although very high efficiency of 6.5% has already been achieved, the efficiency of more than 10% is necessary for the commercialization of OPV. In order to achieve this goal, a new class of low band gap polymer has successfully been prepared together with morphology controlling methods of an active layer of OPV. In this paper, we report the present status of OPV research at Sumitomo Chemical Co., Ltd. as well as worldwide research.
( 18~27 by Kunihito MIYAKE,Yasunori UETANI,Takahiro SEIKE,Takehito KATO,Kenichiro OYA,Ken YOSHIMURA,Toshihiro OHNISHI )

Simulation of a Slab of Random Particulate Medium Containing Metal Clusters

We discuss a simulation method to compute the collimated or the angle-dependent diffuse reflection and transmission of a dielectric slab containing randomly distributed dielectric or metal inclusions. The illumination can either be coherent, incoherent or partially coherent. We solve a multiflux formulation of the scalar radiative transfer equation (SRTE) for the purpose. The scattering and extinction cross-sections and the phase function of a single spherical inclusion are computed using Mie analytical theory. In the case of non-spherical scattering centres, we compute the scattering characteristics using a three dimensional finite-difference time-domain (FDTD) method and a near-to-far field transformation integral. For metal inclusions, a recursive convolution FDTD that implements a 1st order Drude model is used. The near-to-far field transformation is achieved by numerically implementing the well-known Rayleigh-Sommerfeld integral for the propagation of the scalar field components. The simulation method can be used to investigate various nano-structured devices made from composite media for novel optical properties.
( 28~35 by Saswatee BANERJEE,Kiyoharu NAKATSUKA )

Inspection Technique for CUI (Corrosion under Insulation) by Using Fiber Optical AE Sensor

Corrosion under insulation (CUI) is one of the degradation phenomena that have become a serious problem in recent years especially in chemical plants that have been operating for a long time. Development of a CUI inspection technique which doesn"t require the removal of insulation and which is applicable to explosion-proof petrochemical plants is strongly needed. So we focused attention on optical fiber Doppler sensors which already have the explosion-proof characteristics, and we tried to develop a new CUI inspection technique using them. The development of this new inspection technique is explained.
( 36~46 by Toyokazu TADA,Hidehiko SUETSUGU,Hisakazu MORI )

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