Polymer Journals

Polymers and Polymer Composites

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Title: COMPLETE IN-PLANE ELASTIC CHARACTERISATION UNDER TENSILE TESTS OF ANGLE-PLY LAMINATES COMPOSED OF POLYMER-MATRIX LAYERS
Page Range: p.483-492
Author(s): Valot E; Vannucci P; Verchery G
File size: 155K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 7

Abstract
A new strategy is presented which allows for the characterisation of the in-plane elastic properties of a large range of angle-ply laminates using only unidirectional tests. The method uses earlier results for orthotropic laminates in which the conditions of existence of a specific direction apply in which the shear-extension coupling is null. The characterisation of the laminate is made using the results of three tensile tests to produce a pure one-dimensional state of stress. The method can achieve a complete experimental characterisation of the laminate which then does not need any a priori knowledge of the elastic properties of the elementary layer, and provides a simple method by which to verify the predictions of the laminate behaviour obtained by the Classical Laminated Plate Theory when the elementary layer is completely known. Numerical examples and results of some experimental tests are included. 13 refs.

Title: STUDY ON RESIN FLOW THROUGH A MULTI-LAYERED PREFORM IN RESIN TRANSFER MOLDING
Page Range: p.492-510
Author(s): Seong D G; Chung K; Kang T J; Youn J R
File size: 445K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 7

Abstract
The permeabilities are measured in the saturated flow of three kinds of single layered preforms and also of three kinds of multi-layered preforms used in the resin transfer moulding process. A new method of measuring permeability is reported which considers the transverse flow between the two different layers. The proposed method is compared with the weighted average permeability method. The advancement of flow front in multi-layered preforms is investigated theoretically and visualised by a digital camcorder. 26 refs.

Title: IN-PLANE SHEAR MEASUREMENTS OF TEXTILE COMPOSITES WITH LARGE UNIT CELLS USING THE PLATE TWIST TEST
Page Range: p.511-520
Author(s): Weissenbach G; Brown D; Limmer L
File size: 193K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 7

Abstract
In this paper the plate twist test is investigated numerically and experimentally in order to ascertain its applicability to the in-plane shear modulus measurement of advanced woven textile reinforced composite materials. Based on the application of the theory of thin anisotropic plates, a correction factor to compensate for a inboard shift of both loading and supporting points was derived. Corrected shear moduli data compares well with those where the factor by Simms et al is applied. 16 refs.

Title: EFFECT OF PUNCHING DENSITY ON THE MECHANICAL AND THERMAL PROPERTIES OF NEEDLE-PUNCHED NONWOVEN CARBON/PHENOLIC COMPOSITES
Page Range: p.521-530
Author(s): Kang T J; Jung K H; Park J K; Youn J R; Lee S G
File size: 173K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 7

Abstract
The punching density, penetration depth, shape of needle and speed of needling are amongst some of the factors affecting the mechanical properties of needle-punched 3-D preforms. This work reports a study of the mechanical properties of needle-punched non-woven carbon/phenolic composites with different punching densities, and the effect of changes in fibre orientation due to needle punching on the thermal properties of non-woven carbon/phenolic composites.

Title: GRAFT POLYMERIZATION OF VINYL MONOMERS ONTO NANOSIZED SILICON CARBIDE PARTICLES
Page Range: p.531-540
Author(s): Ji Q L; Rong M Z; Zhang M Q; Friedrich K
File size: 131K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 7

Abstract
In order to prepare polymer composites filled with silicon carbide nanoparticles to be used in tribological applications, grafting polymerisation onto the particles was carried out as a way of surface modification in order to tailor interfacial interaction in the composite. The silicone carbide surface was pre-treated with a silane coupling agent, followed by radical grafting polymerisation of acrylamide and styrene respectively. Infrared spectroscopy and measurement of dispersivity in solvent, were used to demonstrate that the desired polymer chains were covalently bonded to the surface of the nanoparticles. In addition, the polymerisation conditions were investigated and the controlling factors were established accordingly. 25 refs.

Title: SILANE MODIFIED FILLERS FOR REINFORCING POLYMERS
Page Range: p.541-552
Author(s): Domka L; Krysztafkiewicz; Kozak M
File size: 207K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 7

Abstract
This work reports on the physicochemical properties of a range of fillers, including synthetic fillers, natural fillers and waste materials such as cement dusts and post-fluor silicas, with reference to their modification with silane coupling agents for use in SBR, PU and PVC compounds. Various types of silane coupling agents (amino-, mercapto-, methacryloxy- and ureidosilanes) were used for surface modification. Results in terms of properties and performance of filled polymers are discussed. 43 refs.

Title: MOLECULAR TRANSPORT OF AROMATIC HYDROCARBONS THROUGH ETHYLENE PROPYLENE DIENE TERPOLYMER
Page Range: p.553-568
Author(s): Kumar P V A; Varughese K T; Thomas S
File size: 174K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 7

Abstract
This study reports the diffusivity, sorptivity and permeability of four aromatic hydrocarbons through crosslinked EPDM rubber membranes. Results indicate that the nature of the crosslinking system influences the transport process. Vulcanisation was carried out using four different systems: conventional, efficient, semi-efficient, and sulphurless. The influence of penetrant size on sorption behaviour of EPDM is also examined. From the diffusion data, the activation energies of diffusion and penetration, enthalpy and entropy of sorption, interaction parameter, etc. were evaluated. 21 refs.

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