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Polymers and Polymer Composites

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Title: IMPACT OF PROCESSING PARAMETERS AND TAPERING OF INJECTION CHAMBER WALLS IN RESIN INJECTION PULTRUSION
Page Range: p.507-519
Author(s): Jeswani A L; Roux J A
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.7

Abstract
The effects of processing conditions and tapering of the injection chamber on wet-out of dry glass fibre roving reinforcements by the liquid polyester resin in the tapered injection pultrusion process were studied by modelling using a three-dimensional finite volume technique with fibre pull speed, fibre volume fraction and resin velocity as process parameters. The impact of tapering of the injection chamber on the minimum injection pressure necessary to achieve complete fibre matrix wet-out and the resin pressure at the injection chamber exit are discussed in terms of chamber design. 18 refs.

Title: INCREMENTAL DAMAGE DEVELOPMENT IN A 3D WOVEN CARBON FIBRE COMPOSITE
Page Range: p.521-533
Author(s): King S; Stewart G; McIlhagger A T; Quinn J P
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.7

Abstract
Damage initiation and subsequent incremental damage development in three-dimensional woven carbon fibre-reinforced epoxy resin composites fabricated by vacuum-assisted resin transfer moulding was investigated experimentally by interlaminar shear strength measurements combined with optical microscopy. The effects of the location of the applied loading and through-the-thickness reinforcement on damage threshold and development are discussed in terms of the presence of resin-rich areas. 17 refs.

Title: AN INVESTIGATION INTO THE EFFECT OF COMPACTION ON THE MECHANICAL PERFORMANCE OF A 3D REINFORCED ADVANCED COMPOSITE
Page Range: p.535-543
Author(s): Stewart G; McIlhagger A T; Quinn J P; King S
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.7

Abstract
The effects of increased fibre volume fraction via compaction on the structure and mechanical properties of three-dimensional woven carbon fibre reinforced epoxy resin composites with through-the-thickness binder tows fabricated using vacuum-assisted resin transfer moulding were investigated by interlaminar shear strength and flexural testing combined with optical microscopy. The results are discussed in terms of distortion of the woven fabric structure with increasing compaction, characterised by decreasing inter-tow distances, nesting and tow deformation. 50 refs.

Title: INFLUENCE OF CITRIC ACID ON THE PROPERTIES OF GLYCEROL-PLASTICISED CORNSTARCH EXTRUSION BLENDS
Page Range: p.545-552
Author(s): Wang N; Yu J; Han C
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.7

Abstract
The effects of citric acid on the properties of glycerol-plasticised dry thermoplastic corn-starch prepared using a single-screw extruder were investigated by SEM, capillary viscometry, FTIR, tensile testing, DMTA and water absorption. The results are discussed in comparison with thermoplastic starch plasticized with glycerol and water in terms of hydrogen bonding interactions between glycerol and starch. 14 refs.

Title: DETECTION AND ESTIMATION OF MONOMERIC ELUATES FROM POLY(METHYL METHACRYLATE) RESIN OF VARIOUS POLYMERISATION MODES
Page Range: p.553-560
Author(s): Amin W M
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.7

Abstract
The leaching into water or artificial saliva of residual methacrylic acid and methyl methacrylate monomers from poly(methyl methacrylate)(PMMA) plates synthesised by different polymerisation methods, including auto-polymerisation, thermal polymerisation and microwave-assisted polymerisation, was investigated by HPLC coupled to a UV detector. The results are discussed in terms of methods of reducing possible health hazards resulting from leaching of residual monomers from PMMA denture bases. 47 refs.

Title: NON-ISOTHERMAL CRYSTALLISATION KINETICS OF POLYAMIDE 6/MESOPOROUS SILICA NANOCOMPOSITES
Page Range: p.561-567
Author(s): Hu Q; Ji X; Lu Y
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.7

Abstract
The non-isothermal crystallisation kinetics of nanocomposites of polyamide-6 with various proportions of mesoporous silica filler particles was investigated at different cooling rates using DSC and by SEM of fracture surfaces, and data was analysed according to the Mandelkern, Jeziorny-Ziabicki and Ozawa models. Analysis of the Avrami exponent is discussed in terms of the effects of filler content on the mechanism of nucleation and growth of polymer crystallites. 31 refs.

Title: BOND BEHAVIOUR OF FRP REINFORCING BARS IN HIGH-STRENGTH STEEL FIBRE-REINFORCED CONCRETE
Page Range: p.569-578
Author(s): Won J-P; Park C-G; Kim H-H; Lee S-W; Won C
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.7

Abstract
The bond behaviour of two different types of carbon fibre-reinforced vinyl ester resin reinforcing bars in high-strength steel fibre-reinforced concrete was investigated by compressive strength, tensile strength and pull-out tests. The effects of the addition of different proportions of steel fibre on mechanical properties and bond strength were studied and the results are discussed in terms of reduction in microcracks at the interface between concrete matrix and reinforcing bar. 23 refs.

Title: PREPARATION AND OPTIMISATION OF POLYETHERSULFONE-BASED COMPOSITE MEMBRANES FOR AIR SEPARATION AT LOW PRESSURES
Page Range: p.579-589
Author(s): Madaeni S S; Esmaeili M; Barzin J
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.7

Abstract
The fabrication by dip coating with solutions of different concentrations of the glassy polymers, ethyl cellulose, poly(vinyl alcohol) and polystyrene of composite membranes based on poly(ether sulphone) supports prepared by a phase inversion and solution casting process, and their characterisation by SEM, FTIR and gas separation performance, is described. The effects of different polymer coatings on oxygen, nitrogen and air permeability and selectivity were studied and the results are discussed. 21 refs.

Title: FLAME RETARDANT POLYETHYLENE WITH INTUMESCENT SYSTEM CONTAINING MACROMOLECULE-ENCAPSULATED LOW MOLECULAR WEIGHT CHARRING AGENT
Page Range: p.591-596
Author(s): Liu M; Huang X; Liu Y; Wang Q
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.7

Abstract
The development of a composite intumescent flame retardant system for high density polyethylene based on a charring agent, pentaerythritol, encapsulated by thermoplastic polyurethane, is described. The synergistic effects of other common flame retardants including melamine phosphate, melamine polyphosphate and ammonium polyphosphate with the composite system were investigated by limiting oxygen index and vertical burning tests, TGA, water absorption and TEM, and the results are discussed in terms of optimisation of flame retardance effects. 23 refs.

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