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Polymers and Polymer Composites

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Title: COMPARISON OF THE MECHANICAL BEHAVIOUR OF WEFT-KNITTED GLASS AND CARBON FIBRE FABRIC-REINFORCED POLYAMIDE-12 COMPOSITES PRODUCED WITH COMMINGLED STAPLE YARNS
Page Range: p.491-498
Author(s): Czigany T; Karger-Kocsis J
File size: 150K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 8

Abstract
A study is reported which compares the mechanical performance of plain weft knitted glass fibre fabric- and carbon fibre fabric-polyamide-12 composites at the same reinforcement content. The composite sheets were produced by hot pressing knit layers consisting of staple glass and polyamide-12 and carbon fibre and PA-12 fibres, respectively. Testing was carried out under both static, (tensile, flexural) and dynamic (perforation impact) conditions. Mechanical anisotropy and large differences between the stiffness and strength due to tensile and flexural loading were attributed to the structure of the knits ('unbalanced' reinforcement) and their non-planar structure in the composite sheets. The carbon fibre-reinforced composite was shown to outperform the glass fibre version both under static and dynamic loading, due to the high strength of the carbon fibre and the good interfacial bonding between the carbon fibre and the PA-12 matrix. 14 refs.

Title: ANALYSIS OF MICRODROPLET TEST: EFFECTS OF SPECIMEN GEOMETRY, MATRIX TYPE, FIBRE TREATMENT AND WATER AGEING
Page Range: p.499-508
Author(s): Hodzic A; Stachurski Z H; Kim J K
File size: 332K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 8

Abstract
The microdroplet test as a means of characterising the interfacial bond strength in fibrous composite materials is analysed and the effects of specimen geometry, matrix type, fibre treatment and water ageing are investigated. Three thermosetting resins were applied to silane coated and acetone washed glass fibres in order to examine the influence of the silane coupling agent on the fibre-matrix bond. The systems were also aged in water at room temperature for periods of 3, 6, and 10 weeks, and the influence of the water degradation on the fibre-matrix bond is investigated for both groups of glass fibres. Results of the testing indicate that the microdroplet test can reliably be used as a measurement tool in fibre-matrix adhesion testing. 15 refs.

Title: PHASE MORPHOLOGY AND DYNAMIC MECHANICAL PROPERTIES OF MODEL POLYBLOCK COPOLYMERS PREPARED FROM REACTIVE OLIGOMERS
Page Range: p.509-514
Author(s): Busko N A; Grishchenko V K; Shtompel V I; Babkina N V; Rosvitsky V F; Privalko V P
File size: 88K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 8

Abstract
Model block copolymers based on styrene and an oligomeric azo-initiator and synthesised by sequential and simultaneous photoinitiated polymerisation were characterised by small angle X-ray scattering and dynamic mechanical analysis. The molar mass characteristics of the block copolymer were shown to be little affected by the method of synthesis, whereas their morphologies and mechanical behaviour in the bulk state were widely different. Glass-rubber transitions of the microphases of each chain component for samples of copolymers produced by simultaneous polymerisation were indicated by SAXS peaks and are claimed to provide evidence of a well-ordered, three-dimensional lattice of isolated styrene domains within a continuous polymer matrix. In contrast, the absence of well-defined SAXS peaks in the same range of scattering vectors for samples synthesised by sequential polymerisation, suggested the existence, it is claimed, of two co-continuous, randomly interpenetrated microphases of styrene and oligomer blocks with a broad distribution of microheterogeneities by size. 13 refs.

Title: REPAIRING BROKEN THERMOSET PIECES USING DIFFUSIONAL PRETREATMENT AND CURE WITH UNCURED RESIN
Page Range: p.515-522
Author(s): Abdelouahab J B; Bouardi A E; Granger R; Vergnaud J M
File size: 106K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 8

Abstract
A method to repair a broken moulded thermoset piece is described. It involves the use of an unsaturated polyester in a two stage procedure. The first involves putting pure resin on the surface of the broken piece over a period of time and then putting this pre-treated piece in the mould in which it was originally, with fresh uncured thermoset made of pure resin with fibreglass and filler, to fill the mould and then curing it. The pretreatment resin on the surface of the broken piece is in contact with the fresh uncured thermoset. The mechanical properties in elongation and flexion of the final material are measured, and it appears that not only is the diffusion of pure resin into the part responsible for an increase in mechanical properties, but also that the time of diffusion is influential. 12 refs.

Title: EFFECT OF METHACRYLIC ACID ON THE MECHANICAL PROPERTIES OF PEROXIDE-CURED SBR VULCANIZATES FILLED WITH ALUMINIUM TRIOXIDE
Page Range: p.523-530
Author(s): Yin D; Zhang Y; Zhang Y; Peng Z
File size: 223K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 8

Abstract
Methacrylic acid, (MAA) was used as an additive for the modification of peroxide-cured SBR highly filled with aluminium trioxide flame retardant filler. Experimental results indicate that the introduction of MAA can improve the mechanical properties of the SBR vulcanisates, and that the mechanical properties of the SBR vulcanisates depend greatly on the MAA and aluminium trioxide contents. The oxygen index of the SBR vulcanisate depends on the aluminium trioxide content and is shown to be less dependent on the MAA content. Scanning electron microscopy shows the changes in the fractured surfaces of the aluminium trioxide filled SBR vulcanisates after the addition of MAA, which is claimed to be related to the changes in mechanical properties. 14 refs.

Title: KINETICS OF ZINC OCTOATE/NONYLPHENOL CATALYSED THERMAL CURE OF BISPHENOL A DICYANATE
Page Range: p.531-540
Author(s): Nair C P R; Gopalakrishnan C; Ninan K N
File size: 128K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 8

Abstract
This study focuses on the detailed kinetics of the catalysed cure of bisphenol A dicyanate (BACY) using zinc octoate/nonylphenol catalyst system and DSC techniques with different analytical approaches. It principally examines the dependency of the kinetic parameters on the catalyst concentration. The data derived, have been used to predict the isothermal cure profile of BACY at different conditions of temperature and catalyst concentration. 31 refs.

Title: ANISOTROPIC BEHAVIOUR OF KNITTED GLASS FIBRE/EPOXY COMPOSITES UNDER COMPRESSIVE AND SHEAR LOADING
Page Range: p.541-548
Author(s): Xu D; Huang Z; Ramakrishna S
File size: 274K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 8

Abstract
The anisotropic behaviour of plain and weft knitted glass fibre fabric epoxy composites, oriented at different off-axial angles and subjected to compressive and shear loads is investigated. An analytical model is applied to calculate the compressive strength at nay off-axial angle, by using three critical strength parameters: compressive strengths of 0 and 90 degrees, and the shear strength of 0 degrees. 15 refs.

Title: EFFECT OF KENAF FIBRES ON THE PROPERTIES OF NATURAL RUBBER VULCANIZATES
Page Range: p.549-560
Author(s): El-Sabbagh S H; El-Hariri D M; El-Ghaffar M A A
File size: 458K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 8

Abstract
The mechanical properties and swelling behaviour of natural rubber vulcanisates loaded with kenaf fibres were studied using hydrated silica, resorcinol and hexamethylene tetramine as the adhesion system, and are compared with those of NR composites loaded wit synthetic polyester short fibres. The effect of fibre content on these mechanical properties were also studied before and after ageing, and scanning electron microscopy was used to investigate the surface texture of unreinforced and reinforced vulcanisates. 23 refs.

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