Polymer Journals

Polymers and Polymer Composites

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Title: PROCESSING, IMPACT RESPONSE AND DAMAGE CHARACTERISATION OF PLAIN-WEAVE CARBON/EPOXY-NANOCLAY NANOCOMPOSITES
Page Range: p.425-435
Author(s): Chowdhury F H; Hosur M V; Jeelani S
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.6

Abstract
An organically modified montmorillonite nanoclay was used to modify a toughened epoxy system using ultrasonic cavitation and 15-layer plain weave carbon/epoxy composites fabricated therefrom by hand lay-up followed by vacuum bag moulding. The basal spacing between the clay galleries was investigated by X-ray diffraction and low velocity impact tests carried out on samples cut from the composites using an instrumented drop-weight tower device. Transient responses of the samples were recorded and analysed in terms of load energy versus time relations and impact damage characterised by ultrasonic C-scanning. 16 refs.

Title: A STUDY OF THE MECHANICS OF POROUS PLGA 85/15 SCAFFOLD IN COMPRESSION
Page Range: p.437-443
Author(s): Leung L; Perron J; Naguib H E
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.6

Abstract
A constitutive model for predicting the compression properties of porous poly(DL-lactide-co-glycolide) open-celled foam scaffolds was derived from the morphology of a unit cubic cell and extrapolated from describing the unit cell to the entire sample by relating cell characteristics to the relative density of the foam. The model was verified by comparing predictions with experimental findings for scaffold samples prepared by the gas foaming/salt leaching method and subjected to uniaxial compression testing and shown to accurately describe the compression behaviour of foams with low relative densities. 28 refs.

Title: EVALUATION OF THE COMPRESSIVE YIELD STRENGTH OF HOLLOW GLASS MICROSPHERE-EPOXY COMPOSITES AS A FUNCTION OF THE MICROSPHERE/EPOXY INTERFACE STRENGTH
Page Range: p.445-451
Author(s): D'Almeida J R M
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.6

Abstract
The effect of the interface on the compression properties of hollow glass microsphere/epoxy composites fabricated under varying interfacial conditions by surface treating the microspheres with a silane coupling agent and also with a silicone oil decoupling agent. The microsphere-to-matrix interaction was also changed by varying the hardener to epoxy monomer ratio. The results obtained were compared with those derived from various mathematical models and discussed in terms of interfacial strength and changes in the reinforcing effect and stress concentration due to the presence of the microspheres. 31 refs.

Title: THERMAL AND MECHANICAL COUPLINGS IN PLAIN AND WOOD FIBRE REINFORCED POLYPROPYLENE DURING TENSILE AND FRACTURE TESTS
Page Range: p.453-462
Author(s): Dupre J-C; Lagattu F
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.6

Abstract
Spruce fibres were incorporated into a PP homopolymer in a twin-screw extruder and the effect of the fibres on the PP investigated using a thermomechanical approach. Simultaneous measurements were made of the strain field and thermal field and mechanical damage studied in both tensile and fracture tests. Whole-field strain measurements were obtained using the digital image correlation method and the thermal field obtained with the aid of an infrared camera. The heat equation established in the context of classical thermodynamics of irreversible processes was used to evaluate the heat sources and fracture behaviour before crack propagation and crack propagation in the composites discussed. 26 refs.

Title: SYNTHESIS AND PROPERTIES OF POLY(METHYLPHENYLSILOXANE) CONTAINING METHACRYLOYL GROUPS
Page Range: p.463-468
Author(s): Sun J T; Huang Y D
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.6

Abstract
Polymethylphenylsiloxane containing methacryloyl groups was synthesised by the co-hydrolysis and polycondensation of methacryloxypropyltrimethoxysilane (MPTS) with other silane monomers. The effect of MPTS on the synthesis, thermal properties and adhesive properties of the polymethylphenylsiloxane was investigated by FTIR spectroscopy, TGA, DTG, scanning electron microscopy and shear strength tests. The polymethylphenylsiloxane possessed the best adhesive properties when the amount of MPTS was 8 wt.%. 15 refs.

Title: CURING BEHAVIOUR OF EPOXY RESIN WITH A DIAMINE CONTAINING HETEROCYCLIC RINGS
Page Range: p.469-474
Author(s): Lu X D; Huang Y D; Zhang C H
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.6

Abstract
The curing behaviour of diglycidyl-4,5-epoxycyclohexane-1,2-dicarboxylate with 2,6-di(p-aminophenyl)benzo(1,2,5,4)bisoxazole as a novel curing agent and with mixtures thereof with diaminodiphenylsulphone was investigated by DSC and compared with that of diaminodiphenylsulphone alone. The Tgs and heat stabilities of the cured epoxy resins were determined by torsional braid analysis, DSC and TGA and average apparent activation energies of the curing reactions calculated using the Kissinger and Ozawa methods. The epoxy resin cured with the new curing agent showed higher cure temperatures and apparent activation energies than that cured with diaminodiphenylsulphone. 16 refs.

Title: SERVICE LIFE PREDICTION OF GFRP REBARS IN AN ALKALINE ENVIRONMENT
Page Range: p.475-479
Author(s): Jong-Pil Won; Su-Jin Lee; Chang-Il Jang; Cheol Won
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.6

Abstract
The long-term durability of a GRP rebar exposed to an alkaline environment mimicking concrete pore water (a pH 12.6 solution of 0.16% calcium hydroxide, 1% sodium hydroxide and 1.4% potassium hydroxide) for 300 days at different temperatures was investigated and the mechanical degradation of the rebar measured by tensile testing. A model for predicting the durability of the rebar in the domestic environment of Korea was derived using the time shift factor concept from the Dejke model and predictions of the Dejke model and new model compared with the experimental findings. 11 refs.

Title: INFLUENCE OF FLAME RETARDANT AND GLASS FIBRE ON NON-ISOTHERMAL CRYSTALLISATION BEHAVIOUR OF PA66
Page Range: p.481-487
Author(s): Liping Li; Bin Li; Fei Tang
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.6

Abstract
The effects of melamine polyphosphate flame retardant and glass fibres on the non-isothermal crystallisation behaviour of polyamide-6,6 were investigated by DSC and Avrami analysis. The activation energy for the transport of macromolecular segments to the growing surface was calculated using the Kissinger method and nucleation activity of glass fibres and flame retardant in the composites determined using Dobreva's method. The flame retardant increased crystallisation rate and decreased the supercooling required for crystallising nucleation and glass fibres increased the crystallisation rate and amount of supercooling. 19 refs.

Title: FREE VIBRATION ANALYSIS AND OPTIMAL DESIGN OF A CANTILEVERED ADHESIVELY BONDED COMPOSITE TUBULAR SINGLE LAP JOINT
Page Range: p.489-506
Author(s): Apalak M Kyildirim M
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.6

Abstract
The results are reported of a three-dimensional free vibration analysis and modal stress analysis of an adhesively bonded cantilevered graphite fibre-reinforced epoxy composite tubular single lap joint. The effects of design parameters of the adhesive (epoxy resin) and composite tubes, such as fibre angle, fibre volume fraction, adhesive thickness, overlap length, inner tube radius and tube thickness, on the first ten natural frequencies and mode shapes of the joints are examined using a proposed back-propagation artificial neural network model. A genetic algorithm is combined with the artificial neural network model to search for an optimal joint design in which the natural frequencies are maximised and the corresponding modal strain energies of the joint are minimised. 28 refs.

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