Papers by Keyword: Polycarbonate

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Authors: Tie Jun Wang, Kikuo Kishimoto, Mitsuo Notomi
Authors: Gang Qin, Li Dan Fan, Rui Zhang, Shao Kui Cao
Abstract: A catalyst of BTPD-Zn (BTPD= N,N’-Bis(2-thiophenecarboxaldehy) o-phenylenediamine) has been found to be active toward the copolymerization of cyclohexene oxide and carbon dioxide, and a kind of good biodegradable material named poly(cyclohexene carbonate) is prepared with turnover number of 105.8 in 100°C. The molar fraction (fc) of polycarbonate in copolymer is 96%. The obtained copolymers were characterized by IR and NMR.
Authors: Li Dan Fan, Gang Qin, Xin Xin Cao, Shao Kui Cao
Abstract: A novel catalyst for the copolymerization of CO2 and cyclohexene oxide(CHO) was prepared by using BTE and ZnCl2. The zinc complex showed catalytic activity for the copolymerization. The obtained copolymer was characterized by IR and NMR. Effect of reaction time on copolymerization was investigated.
Authors: Anton Valkov, Faina Nakonechny, Marina Nisnevitch
Abstract: Photosensitizers immobilized in polymers can serve as antibacterial surfaces or coatings and can be applied for disinfection of water or medical instruments. The antibacterial activity of the immobilized photosensitizers is based on their excitation by visible light followed by energy transfer from the photosensitizers to oxygen dissolved in an aqueous phase which produces reactive oxygen species that cause irreversible damage to bacterial cells. The photosensitizer Rose Bengal immobilized in polystyrene, polycarbonate and poly (methyl methacrylate) was shown to eradicate Gram-positive Staphylococcus aureus bacteria under moderate illumination.
Authors: M. Wang, S. Miyake
Abstract: To realize ultrahigh density recording in high precision using polycarbonate as a recording media, the nanometer-scale mechanical processing properties of polycarbonate and fluorocarbon plasma-treated polycarbonate were investigated using atomic force microscopy (AFM). The surface free energy of the polycarbonate specimen can be reduced by fluorocarbon plasma-treatment, resulting in processing force being reduced. Thus, nanometer-scale precise processing of polycarbonate can be realized. Lines and spaces with intervals minimized to 60 nm were performed on the fluorocarbon plasma-treated polycarbonate. Viscoelastic properties of the fluorinated polycarbonate were evaluated using AFM in force modulation mode. Fluorocarbon plasma treatment can reduce friction force of a polycarbonate sample and improve its wear resistance. Therefore, the friction durability corresponding to the reliability of data reproduction was markedly improved.
Authors: Atsushi Kubo, Yoshitaka Umeno
Abstract: Coarse-graining molecular dynamics simulations were carried out for deformation and fracture problems in polycarbonate. The effects of temperature and molar mass on deformation behavior were qualitatively investigated. Temperatures below the glass transition point were examined. The temperature effect was found to be consistent with all-atom simulations and experiments. On the investigation of molar mass effect, it was revealed that complex entanglement of massive molecules can prevent voids from growing.
Authors: Vojtech Senkerik, Michal Stanek, David Manas, Miroslav Manas, Adam Skrobak, Jan Navratil
Abstract: This research paper deals with behavior of recycled material at higher temperature. Assessment of recycled material influence takes place on four kinds of thermoplastic materials, which are always high-heat polycarbonate (PC-HT) with different amount of recycled material (pure polycarbonate, polycarbonate with twenty percent of recycled material, polycarbonate with thirty percent of recycled material and hundred percent of recycled polycarbonate). Specimens were prepared by the mostly used technology for production products, which is injection molding. Each kind of material is one by one loaded by high temperature 110°C and consequently tested. This temperature was chosen because we encounter products made with recycled material additive, which can be used at elevated temperatures. To determine behavior of recycled material at this high temperature, one basic mechanic material tests is used. This test is normalized compression test.
Authors: S.D. Ramsay, R.M. Pilliar, Liu Yang, J.P. Santerre
Abstract: Particle filled composite and interpetrating phase composite (IPC) structures are investigated for the production of a biodegradable composite for use as a fixation device in various osteosynthesis applications. The composites consist of calcium polyphosphate, present as either a dispersion of 106 – 150 µm particles or as a sintered scaffold-like structure having open porosity in the range of 18 – 35 volume percent, and a polyvinyl acid-carbonate copolymer that is cured in situ via free radical polymerization. The performance of each composite structure is evaluated in terms of its three-point bend strength and elastic constant. Plane strain fracture toughness values are also presented for IPC samples based on CPP sintered to have 30 volume percent porosity.
Authors: Han Ki Kim, Jung Hyeok Bae, Jong Min Moon, Sang Woo Kim, Soon Wook Jeong, Do Geun Kim, Jae Wook Kang
Abstract: Electrical, optical, and structural properties of amorphous indium zinc oxide (IZO) anode films grown on flexible polycarbonate (PC) substrate were investigated. The x-ray diffraction (XRD) result shows that the IZO film grown at room temperature is complete amorphous structure due to low substrate temperature. A sheet resistance of 34.1 ,/, average transmittance above 88.9% in visible range, and root mean spare roughness of 3.5~10.5 Å were obtained even in the amorphous IZO anode film grown on PC substrate at room temperature. It is shown that the Ir(ppy)3 doped-flexible organic light emitting diode (OLED) fabricated on the amorphous IZO anode exhibit comparable current-voltage-luminance characteristics as well as external quantum efficiency and power efficiency to OLED fabricated on conventional ITO/glass substrate. These findings indicate that the IZO anode film is a promising anode material for the fabrication of flexible OLEDs.
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