γ‐Radiation vulcanized natural rubber (RVNR)/phase transfer/suspension polymerization technique was used to prepare high‐impact polystyrene (HIPS) in bead form. The high notched Izod impact resistance of HIPS based on RVNR was observed and compared with that of unmodified PS. The impact resistance of HIPS based on RVNR was further enhanced by addition of 10% of polystyrene‐block‐polyisoprene‐block‐polystyrene copolymer. A mesh structure of all crosslinked rubber particles containing polystyrene and long crazes in HIPS were observed under electron microscopy. Copyright © 2003 Society of Chemical Industry

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New single-polymer electroluminescent system containing three individual emission species of polyfluorenes as a blue host, 2,1,3-benzothiadiazole unit as a green dopant and phenylene derivative unit as a red dopant on the main chain were synthesized and characterized. All polymerizations were carried out by palladium(0) catalyzed Suzuki coupling reaction with equivalent molar ratio of the diboronic ester monomer to the dibromo monomers under dry argon protection. The structure and properties of these polymers were characterized using UVvis spectroscopy, GPC, Photoluminescence (PL), and Electroluminescence (EL) spectroscopy. The synthetic polymers, Polyfluorene [PF], Poly(fluorene-benzothiadiazole-pyridine) [PF-BT-PD], were soluble in common organic solvents and easily spin-coated onto the indium-tin oxide (ITO)-coated glass substrates. The optical band gaps of polymers of 2.97 eV and 2.55 eV corresponding to PF and PF-BT-PD, respectively were calculated from the onset of UV-vis spectra. Light-emitting diodes(LEDs) with ITO/PEDOT:PSS/polymer/LiF/Al configuration were fabricated, and the devices using copolymers showed red shift EL spectra relative to that of PF. The fabricated light-emitting devices showed good performance in terms of turn on voltage and electroluminescence. The new PF-BT-PD copolymer was successfully employed as emissive polymer layer in polymer light-emitting devices (PLEDs). The turns on voltages of copolymers were lower than that of PF. By changing the molar ratios of these monomer units, the electroluminescence spectra can be adjusted to white-light emission.

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This paper describes the synthesis and photovoltaic studies of Poly(3-Phenylthiophene) (P3PhT). P3PhT was synthesized by the chemically oxidized polymerization in the presence of FeCl 3 . Bulk heterojunction solar cells based on polymer were fabricated by using chloroform, chlorobenzene, and dichlorobenzene at different weight ratios of P3PhT. The different ratios of P3PhT as the electron donor blended with [6,6]-phenyl-C61-butyric acid methyl ester (PC 61 BM) as the electron acceptor were investigated. A maximum power conversion efficiency was achieved at a 2:3 (wt:wt) P3PhT:PC 61 BM blend ratio in dichlorbenzene.