Polymer Journals

Polymers and Polymer Composites

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Title: SYNTHESIS OF NOVEL DONOR-ACCEPTOR POLYMER BLENDS AND THEIR PROPERTIES
Page Range: p.529-533
Author(s): Sabagh B; Foot P J S
File size: 143K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.9

Abstract
Electron donating/electron accepting conjugated polymer blends of poly(3-(2-methoxyethoxy)ethoxymethylthiophene-2,5-diyl) (electron-rich polymer) and poly(3-nitropyridine-2,5-diyl) (electron-deficient polymer) were dissolved in N,N-dimethylformamide and mixed together in electrically-equivalent proportions. Films were solvent cast from the blends and investigated by UV vis spectroscopy, ESR spectroscopy and cyclic voltammetry. Some evidence for partial charge transfer from the electron-rich to the electron-deficient polymer was found. 8 refs.

Title: SILVER ION RELEASE FROM ANTIMICROBIAL ACRYLATE PHOTOPOLYMER LAYERS
Page Range: p.535-543
Author(s): Damm C; Muenstedt H
File size: 222K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.9

Abstract
Crosslinked, silver-filled, trifunctional acrylate photopolymer layers on PEEK films were prepared by a heterogeneous photocatalytic polymerisation initiation using silver-coated titanium dioxide for polymerisation initiation. The morphology of, release of silver ions from and antimicrobial efficacy of the photopolymer layers were investigated and the effect of water diffusion on silver ion release from the photopolymer layers evaluated. The amount of silver ions released from the photopolymer layers required to eliminate E coli completely within 24 h was determined. 27 refs.

Title: BONDING PROPERTIES OF CARBON FIBRE REINFORCED POLYMER (CFRP) REINFORCING BAR IN HIGH-STRENGTH CONCRETE WITH MINERAL ADMIXTURES
Page Range: p.545-556
Author(s): Chan-Gi Park; Jong-Ok Kim; Seung-Ki Park; Nam-Su Jung; Jong-Pil Won
File size: 318K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.9

Abstract
The effects of mineral admixtures and reinforcing fibres on the bond strength of high-strength concrete to carbon fibre-reinforced vinyl ester composite reinforcing bars were investigated. The mineral admixtures consisted of 5, 10 and 15% fumed silica or meta-kaolin in cement and the reinforcing fibres were composed of steel, PVAl or a PP-based polymer. The tensile properties of the reinforcing bar were determined and compression strength of the concrete evaluated as a function of fibre content and mineral admixture. Bond strength was found to increase with the strength of the concrete and both bonding behaviour and relative bond strength improved with the addition of the reinforcing fibres. Both absolute and relative bond strengths were enhanced by adhesion forces induced by the mineral admixture. 20 refs.

Title: POLYSTYRENE-CARBON NANOTUBES COMPOSITES PREPARED BY MICROEMULSION POLYMERIZATION FOR VAPOUR SENSORS
Page Range: p.557-561
Author(s): Qiang Li; Liang Li; Guoping Yan; Dengbang Jiang; Zhiyu Cheng
File size: 156K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.9

Abstract
Polystyrene/carbon nanotube composites for gas sensors were prepared by in-situ microemulsion polymerisation and the morphology, thermal properties and electrical response to various vapours of the nanocomposites investigated using various methods, including TEM, DSC and thermogravimetry. The properties of the nanocomposites were compared with those of nanocomposites prepared by direct solution mixing. The nanocomposites prepared by microemulsion polymerisation exhibited a better response and reversibility. 25 refs.

Title: EFFECTS OF MOLECULAR WEIGHT OF POLYPROPYLENE ON THE CORRELATION BETWEEN FRACTURE TOUGHNESS AND MECHANICAL/IMPACT PROPERTIES OF GFPP COMPOSITES
Page Range: p.563-573
Author(s): Ogazi-Onyemaechi B C; Yew Wei Leong; Nakai A; Kotaki M; Hamada H
File size: 493K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.9

Abstract
The effects of maleic anhydride grafted PP and the molec.wt. of PP on the fracture toughness and mechanical properties of glass fibre-reinforced PP composites containing PPs with different molec.wts. were investigated by various techniques. Techniques employed included tensile testing of unnotched and notched dumbbell samples, J-integral analysis, scanning electron microscopy, regression analysis and optical microscopy. The results obtained are discussed in terms of tensile and fracture toughness properties, crack propagation, interfacial shear strength, impact properties, relationship between fracture toughness and PP molec.wt./mechanical properties and interfacial shear strength and strength of association between fracture toughness and composite properties. 35 refs.

Title: PREPARATION OF LINEAR LOW DENSITY POLYETHYLENE/POLY(ETHYLENE-CO-VINYL ACETATE) BLEND FILMS WITH VARIOUS TRANSPARENCIES
Page Range: p.575-580
Author(s): Kun Young Kwak; Young Jae Lee; Kyeong Il Oh; Du Hyun Song; Eun Joo Shin; Han Yong Jeon; Yeong Soon Gal; Tae Hwan Oh; Sung Soo Han; Han Gon Choi; Yong Rok Lee; Seok Kyun Noh; Won Seok Lyoo
File size: 220K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.9

Abstract
Films of blends of LLDPE and EVA with various vinyl acetate contents and degrees of transparency for waterproof sheets used in tunnel construction were prepared by hot plate pressing and the effects of the vinyl acetate content in the EVA and the ratio of EVA in the blends on the structure and properties of the films investigated. Film transparency was measured using a UV vis-near infrared spectrometer and film structure/properties studied by DSC, wide angle X-ray diffraction, TGA and dynamic mechanical analysis. Film transparencies were classified into three types (non-transparent, semi-transparent and transparent) and a new degree of transparency standard established. 15 refs.

Title: TAILORING OF TEFLON-FEP FILM THROUGH GRAFT-COPOLYMERIZATION WITH POLAR MONOMERS FOR DESALINATION PROCESSES: EFFECT OF SWIFT HEAVY IRON IRRADIATION
Page Range: p.581-593
Author(s): Kauer I; Rattan S; Chauhan S; Gupta N
File size: 432K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.9

Abstract
4-Vinyl pyridine and methacrylic acid were grafted onto Teflon-FEP films by a pre-irradiation method to produce ionic membranes and the effects of various reaction parameters on percentage grafting investigated. Optimum conditions were established and used to graft the monomers onto the film irradiated at different fluence with Swift heavy ions. The membranes were characterised by FTIR spectroscopy, scanning electron microscopy and TGA and their swelling behaviour in various polar solvents investigated. The affinity of the membranes for Na+ and Cl- ions was also investigated by conductance measurements in aqueous sodium chloride solution and the suitability of the membranes in desalination processes considered. 23 refs.

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