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Polymers and Polymer Composites

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Title: INFLUENCE OF POLYESTER RESIN PROPERTIES ON THE STRESS CORROSION RESISTANCE OF GLASS FIBER REINFORCED COMPOSITES
Page Range: p.457-467
Author(s): Bogner B R; Pretzer W R
File size: 192K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 6

Abstract
It is known that the long-term strength of a glass fibre composite can be significantly reduced when the composite is exposed to high stresses in the presence of water. Resin properties such as heat deflection temperature and tensile elongation are shown to affect composite lifetime under conditions of sustained stress at various temperatures in an aqueous environment. The measurement of time to failure of unidirectional glass fibre reinforced composite rods containing E-glass fibre strands and one of a series of isopolyester resins suggested a correlation between stress, time to failure, and the temperature differential between the resin heat deflection temperature and the exposure temperature. Such correlations were established, and it was found that time to failure decreased significantly at moderate relative stress as the temperature differential (HDT-exposure temperature) became less than 10 degrees C. 13 refs.

Title: BUCKLING AND ULTIMATE FAILURE OF THIN-WALLED PULTRUDED COMPOSITE COLUMNS
Page Range: p.469-481
Author(s): Hassan N K; Mosallam A S
File size: 274K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 6

Abstract
The results are presented of an investigation on the buckling behaviour of concentrically loaded thin-walled pultruded fibre reinforced polymer composite columns. Both open- and closed-web columns were evaluated. Finite element analysis and theoretical predictions are presented and correlated with experimental data. Good agreement was found between theoretical, analytical and experimental results. Also presented are guidelines for the determination of the bending stiffness and the critical buckling load for pultruded composite columns, and a discussion on the axial strength of unidirectional pultruded fibre reinforced polymer columns, together with the identification of different modes of failure. 18 refs.

Title: HOW MANY MONOMER REPEAT UNITS ARE NECESSARY FOR RELIABLE MOLECULAR DYNAMICS SIMULATION?
Page Range: p.483-489
Author(s): Kwon Y W; Harrell A F
File size: 94K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 6

Abstract
A series of numerical tests was carried out in an attempt to answer the question of how many monomer repeat units are necessary in molecular dynamics simulation in order to obtain reliable i.e. repeatable solutions. Based on the numerical results, reliable solutions were found to require approximately ten thousand monomer repeat units at minimum, which was the sum of the monomer units in every polymer chain molecule. For a particle reinforced composite that consists of metallic atoms embedded in a polymer matrix, the minimum number of total monomer repeat units in the polymer matrix was found to be approximately five thousand for reliable solutions. 13 refs.

Title: RECYCLING OF GLASS FIBRE REINFORCED PHENOLIC PREPREG WASTE PART 1. RECOVERY AND REUSE OF GLASS FIBRES IN PP AND PA6
Page Range: p.491-500
Author(s): Groening M; Hakkarainen M; Albertsson A
File size: 224K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 6

Abstract
This study confirms that glass fibres can be recovered from phenolic prepreg scrap and reused as reinforcing filler in polypropylene and nylon-6. The untreated glass fibres showed good compatibility with nylon-6, but poor compatibility with PP. Surface treatment of the recovered glass fibres using gamma-aminopropyltriethoxysilane was shown to improve this in both cases and to significantly increase the composite tensile strengths. 29 refs.

Title: RECYCLING OF GLASS-FIBRE REINFORCED PHENOLIC PREPREG WASTE. PART 2. MILLED PREPREG AS FUNCTIONAL FILLER IN PP AND PA
Page Range: p.501-509
Author(s): Groening M; Hakkarainen M; Albertsson A
File size: 155K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 6

Abstract
The aim of this study was to find a feasible technique for the re-use of phenolic prepreg waste as a functional filler in PP and nylon-6, using standard processing equipment. In particular, the study aims to evaluate the possibility of re-using milled prepreg as filler in nylon-6, which has not been reported in the literature, it is claimed. The compatibility between phenolic prepreg and nylon-6 or PP was investigated using scanning electron microscopy of fractured surfaces. The effects of surface treatment using gamma-aminopropyltriethoxysilane, and compatibilisation using maleic anhydride functionalised PP on the composite's mechanical properties were investigated. 30 refs.

Title: STABILISATION OF 3D PREFORMS WITH THERMOPLASTIC MONOFILAMENT FOR ADVANCED COMPOSITE MANUFACTURE
Page Range: p.511-517
Author(s): Rogers P P J; McIlhagger A T; McIhagger R; Quinn J
File size: 201K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 6

Abstract
This paper describes work carried out on three-dimensional woven preforms constructed for use in resin transfer moulding. Preforms were produced incorporating a thermoplastic monofilament within the architecture. A polyethylene monofilament was used as the thermoplastic consolidating medium. Testing showed that a significantly greater force was required to pull out a carbon fibre yarn from the dry preform in samples that contained the consolidated thermoplastic. It therefore concluded that the stability and handleability of near net-shape preforms would be improved by the inclusion of a consolidated thermoplastic yarn near the edges as it would minimise plastic deformation and fibre displacement. Impregnation of modified preforms was undertaken by resin transfer moulding in order to assess the mechanical properties, and the properties of composites made from the modified preforms were shown to be comparable with those of a conventional composite. 14 refs.

Title: INTERACTING BLENDS OF NOVEL UNSATURATED POLYESTER AMIDE RESIN WITH METHYL METHACRYLATE
Page Range: p.519-524
Author(s): Patel H S; Panchal K K
File size: 173K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 6

Abstract
Blending of hydrophilic polyamide and hydrophobic polyesters can produce products which could find a variety of applications. The introduction of unsaturation, amide and ester groups into one polymer chain may afford polymers which have a crosslinking capability with vinyl monomers. The authors have reported novel unsaturated poly(ester-amide) resins, synthesised by using epoxy resins, and this particular study investigates the interacting blends of unsaturated poly(ester-amide) with the vinyl monomers, and describes the interacting blends of unsaturated poly(ester-amide) with methyl methacrylate. The chemical, mechanical and electrical properties of the glass fibre composites based on unsaturated polyesteramide- MMA resin blend were evaluated. 15 refs.

Title: EFFECT OF GAMMA-IRRADIATION ON THE PROPERTIES OF RUBBER-BASED CONDUCTIVE BLEND COMPOSITES
Page Range: p.525-534
Author(s): Madani M
File size: 125K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 6

Abstract
In order to improve the heat and ozone resistance of butyl rubber, it is blended with EPDM, and fillers are incorporated to improve the physicochemical properties. The influence of gamma irradiation on the electrical, swelling and mechanical properties of crosslinked butyl rubber and EPDM, and their blends is investigated. Results of tests showed that the modulus increased while the elongation at break decreased with irradiation. The gap-width between carbon-carbon particles was found to be highly affected by the irradiation dose, which in turn influenced the electrical conductivity of these blends. The swelling equilibrium data in different solvents were analysed by the Flory-Rehner equation to obtain estimates of the average molecular weight and crosslink density. 27 refs.

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