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Polymers and Polymer Composites

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Title: SURFACE FUNCTIONALISATION OF POLYESTER NONWOVEN FABRICS BY SPUTTER COATING OF TITANIUM DIOXIDE
Page Range: p.347-351
Author(s): Yang Xu; Ning Wu; Qufu Wei; Libo Chu
File size: 298K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.6

Abstract
Direct current reactive magnetron sputtering was used to deposit functional titanium dioxide films onto polyester nonwoven fabrics, and the topography and chemical compositions of the coated fabrics were investigated using atomic force microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy. Morphology of polyester fibres was seen to have been significantly modified by the sputtering process, and adhesion of the titanium dioxide films to the substrate was satisfactory. Ultraviolet absorption and antistatic properties of the fabrics were significantly improved by the process. 12 refs.

Title: CHARACTERISATION OF HYDROXYAPATITE/BACTERIAL CELLULOSE NANOCOMPOSITES
Page Range: p.353-358
Author(s): Shengnan Zhang; Guangyao Xiong; Fang He; Yuan Huang; Yulin Wang; Yizao Wan
File size: 173K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.6

Abstract
A biomimetic route was used and described to prepare a composite of hydroxyapatite (HAP) deposited on a phosphorylated bacterial cellulose (BC). The composite was examined using X-ray photoelectron spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, differential scanning calorimetry and thermogravimetric analysis. It was shown that thermal stability of the composite was better than the original BC and that the HAP crystals wrap the surfaces of the BC fibres. Weight loss under thermogravimetric analysis conditions was in three stages, similar to natural bone. 21 refs.

Title: SYNTHESIS AND CHARACTERISATION OF POLYANILINE/MONTMORILLONITE NANOCOMPOSITES
Page Range: p.359-363
Author(s): Shakoor A; Rizvi T Z; Foot P J S
File size: 222K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.6

Abstract
Oxidative polymerisation of aniline using solution polymerisation with an aniline/ammonium persulphate ratio of 2:1 in the presence of a montmorillonite clay resulted in the formation of a nanocomposite. The composites were characterised using X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy and it was observed that the polyaniline was largely incorporated into the clay. Electrical conductivity of the nanocomposites was investigated and was found to follow a temperature dependence relationship that was associated with one-dimensional variable-range hopping. 21 refs.

Title: PREPARATION AND CHARACTERISATION OF PHASE CHANGE MATERIAL-LOADED POLYUREA MICROCAPSULES SEVERAL HUNDRED MICROMETRES IN DIAMETER
Page Range: p.365-369
Author(s): Takei T; Yoshida M; Nagayoshi T; Hatate Y; Shiomori K; Kiyoyama S
File size: 263K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.6

Abstract
Oil-in-water emulsion polymerisation with two types of isocyamate monomers in the oil phase and hexamethylene diamine in the water phase, with tetradecane as phase change material (PCM), was used to prepare PCM-loaded polyurea microcapsules some several hundred micrometers in diameter. Isocyanate monomers included toluene diisocyanate (TDI) and phenyl isocyanate, and to achieve the microcapsules a suitably adjusted agitation rate proved necessary. Microcapsule morphology was affected by the ratio of the two isocyanates, with higher ratio of the TDI proving more beneficial. Microcapsules were characterised using scanning electron microscopy and differential scanning calorimetry. 17 refs.

Title: NON-LINEAR FATIGUE FRACTURE ANALYSIS OF COMPOSITE LAMINATES
Page Range: p.371-377
Author(s): Rizov V
File size: 323K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.6

Abstract
Non-linear fatigue fracture in composite laminates was investigated experimentally using polyester/glass fibre laminates, and by numerical analysis using finite element analytical methods. Experiments were carried out using sinusoidal tensile loads on samples in which an initial crack was introduced. Good agreement was obtained between experimental and simulated results, and it was shown that fatigue damage was concentrated around the crack tip. Relationships between the fatigue crack growth and J-integral range were discussed. 25 refs.

Title: THE EFFECT OF COMPATIBILISING AGENT AND SURFACE MODIFICATION ON THE PHYSICAL PROPERTIES OF SHORT PINEAPPLE LEAF FIBRE (PALF) REINFORCED HIGH IMPACT POLYSTYRENE (HIPS) COMPOSITES
Page Range: p.379-384
Author(s): Siregar J P; Sapuan S M; Rahman M Z A; Zaman H M D K
File size: 223K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.6

Abstract
The effects of alkali treatment of short pineapple leaf fibres, or the addition of different levels of compatibiliser, on the physical properties of composites prepared from polystyrene and short pineapple leaf fibre were investigated using density measurements, melt flow index, swelling and water absorption measurements. It was found that the addition of compatibilising agents had more effect on composite properties than did the alkali treatment of fibres. Two types of compatibiliser were used, a copolymer of polystyrene and maleic anhydride or a block copolymer of polystyrene, ethylene-butylene copolymer and styrene-maleic anhydride copolymer. 12 refs.

Title: POTENTIAL ADVANTAGES OF POLY(ACRYLONITRILE-CO-METHYL ACRYLATE)/SODIUM SILICATE NANOCOMPOSITES OVER P(AN-CO-MA) COPOLYMER
Page Range: p.385-394
Author(s): Samal B; Rana P K; Sahoo P K
File size: 475K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.6

Abstract
Synthesis of a copolymer of acrylonitrile and methyl acrylate, and a nanocomposite of this polymer with sodium silicate, was carried out using similar emulsion polymerisation methods with ammonium persulphate used as initiator and an in situ transition metal complex as catalyst. Properties of the polymer and nanocomposite were compared using Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, ultraviolet visible spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, intrinsic viscosity measurements, tensile properties, water absorbency and biodegradation in sludge water, soil burial conditions or in a culture medium. The nanocomposite was shown to have improved thermal stability, biodegradability and water absorbency (superabsorbency) compared to the simple copolymer. 35 refs.

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