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Polymers and Polymer Composites

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Title: MULTI-SCALE MODELLING OF LONG-TERM MECHANICAL BEHAVIOUR IN POLYMER COMPOSITE LAMINATES WITH WOVEN FIBRE ARCHITECTURE
Page Range: p.297-318
Author(s): Gupta V; Roy S; Dharani L R
File size: 2218K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 5

Abstract
An analytical model for predicting the long-term durability of polymer composite laminates with woven fibre architecture is presented, which takes a micromechanics approach towards modelling the out-of-plane viscoelastic behaviour of the laminate. A five-harness satin woven fibre cross-ply composite laminate is investigated, taking into consideration of the weave architecture and time-dependent effects. The classical lamination theory model is adapted to include the in-plane elastic behaviour of woven fibre composites. For the matrix-dominated out-of-plane response, a viscoelastic creep model is employed to model the resin. In addition, physical ageing of the matrix is included in the model, using the effective time theory proposed by Struik. The effect of large deflections and rotations on the time dependent out-of-plane behaviour is also investigated using the micromechanics model. The homogenised in-plane and out-of-plane compliance obtained using the proposed micromechanics methodology could be applied within the framework of a structural finite element code to model the macro-scale long-term behaviour of a woven fabric composite structure, it is maintained. 26 refs.

Title: PARTICLE MOTION AND SEGREGATION IN PISTON DRIVEN FREE SURFACE FLOWS OF VISCOELASTIC FLUIDS
Page Range: p.319-326
Author(s): Ogadhoh S O; Papathanasiou T D
File size: 737K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 5

Abstract
Solid particle motion, redistribution and segregation is investigated in a viscoelastic fluid during piston-driven free surface flows. This phenomenon and its effect on suspension microstructure is examined with particular respect to the injection and compression moulding of composite materials. PMMA particles were dispersed in a hydrated hydroxypropyl guar gel. Particles were observed to move away from the piston and towards the free surface where they slowly accumulate, thus confirming theoretical predictions that in the presence of a normal stress gradient perpendicular to the direction of bulk flow, suspended particles tend to gravitate towards and then remain near the free surface. Simulations show that the speed of this segregation increases with fluid elasticity, shear rate and particle size, in agreement with literature models for the lateral migration velocity of particles in viscoelastic fluids.12 refs.

Title: PHOTOPOLYMERIZATION OF EXO-METHYLENE-1,3-DIOXOLANE WITH BISPHENOL-A-DIGLYCIDYLETHER AND METHYL METHACRYLATE USING PHOTOINITIATORS
Page Range: p.327-332
Author(s): Sherif M H; Klemm E; Gunther W; Stadermann D
File size: 415K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 5

Abstract
The copolymerisation of 2-exo-methylene-4-phenyl,3-dioxolane with bisphenol-A-diglycidylether and methyl methacrylate using a cationic and a radical initiator is described. The structure of the polymers is elucidated by NMR and IR spectroscopy. Using a cationic photoinitiator, the dioxolane structure is maintained in the copolymer and remaining oxirane structures from the bisphenol-A-diglycidylether can be proved. It is demonstrated that no complete ring-opening of the dioxolane takes place in the presence of a radical initiator, leading to statistical polymers with methyl methacrylate. 6 refs.

Title: POLY(BUTYLENE SUCCINATE) COMPOSITES REINFORCED WITH SHORT SISAL FIBRES
Page Range: p.333-338
Author(s): Shibata M; Makino R; Yosomiya R; Takeishi H
File size: 1443K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 5

Abstract
This report describes an investigation into polybutylene succinate reinforced with sisal fibres for the development of a fully biodegradable composite with superior mechanical properties. The influence of fibre length, fibre content and surface treatment of the fibres on the mechanical properties of the composite were evaluated. 18 refs.

Title: PREDICTION OF THE ULTIMATE STRENGTH OF COMPOSITE LAMINATES UNDER IN-PLANE LOADING USING A PROBABILISTIC APPROACH
Page Range: p.339-344
Author(s): Kang T J; Cho Y J; Youn J R; Chung K; Lee K W
File size: 425K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 5

Abstract
A numerical approach is presented for the prediction of ultimate strength of composite laminates. In order to take into account the wide scatter in ply strengths, the basic strength distribution functions for the longitudinal, transverse, and in-plane shear strengths were obtained using a two-parameter Weibull distribution. These functions, in conjunction with the Tsai-Hill failure criterion, were then used to predict the ultimate strength of the composites. 8 refs.

Title: YIELDING AND FRACTURE TOUGHNESS OF GLASS MICROBALLOON-FILLED EPOXY COMPOSITES
Page Range: p.345-350
Author(s): Zihlif A M; Ragosta G
File size: 1195K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 5

Abstract
The yielding and fracture toughness of a glass microballoon filled epoxy resin were investigated as a function of filler content, temperature and strain rate. The variations in the measured mechanical properties are discussed in terms of the observed morphology and thermal behaviour of the epoxy composites. 25 refs.

Title: EFFECT OF CHEMICAL OXIDATION ON THE INTERFACIAL BONDING BETWEEN CARBON FIBRE AND EPOXY RESIN
Page Range: p.351-359
Author(s): Lin J-S; Huang Y-H; Chiu H-T
File size: 4571K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 5

Abstract
Polypyrrole was deposited onto carbon fibres via the oxidation polymerisation of pyrrole with ferric ions. These Ppy-deposited carbon fibres were then made into composite boards with epoxy resin. The interfacial bonding between carbon fibre and epoxy resin was evaluated by measuring the interlaminar shear strength, tensile strength before and after impact, and flexural strength. 10 refs.

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