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Polymers and Polymer Composites

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Title: CONTINUOUS CONSOLIDATION OF POLYPROPYLENE/GLASS FIBRE COMMINGLED FABRIC
Page Range: p.1-8
Author(s): Borazghi H; Trudel-Boucher D; Denault J; Fisa B
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.1

Abstract
An experimental investigation was carried out into the continuous consolidation of PP/glass fibre commingled fabric using a continuous roll forming process to determine if it was possible to obtain a quality similar to that achieved by compression moulding. Compaction trials were performed at different fabric temperatures and compaction speeds to determine the influence of these parameters on the level of consolidation. Roll forming experiments were then conducted for different combinations of roll-gap, fabric temperature and line speed and the quality of consolidation assessed by observing polished micrographs of cross-sections and determining void content and flexural properties. Composites with satisfactory quality were produced by continuous consolidation of 4 plies of 1485 g/cu.m. fabric at a rate of 0.5 m/min. 18 refs.

Title: THERMAL EXCHANGES AND THERMOMECHANICAL COUPLINGS IN AMORPHOUS POLYMERS
Page Range: p.9-17
Author(s): Germaneau A; Dupre J C
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.1

Abstract
An investigation was carried out to determine energy (heat sources, mechanical energy and internal dissipated energy) during the mechanical testing of polymers from an analysis of strain and thermal data. Heat sources were calculated using a heat equation established using classical thermodynamics concepts and a technique developed to estimate thermal parameters easily without knowledge of the value of the heat source (equal to zero) whilst remaining within the framework of the heat equation. Large strain mechanical tests were carried out on a standard polycarbonate tensile specimen with a thickness equal to 4 mm and the energy balance calculated and associated with volumetric deformation. 23 refs.

Title: E-GLASS/PHENOLIC PREPREG PROCESSING BY SOLVENT IMPREGNATION
Page Range: p.19-26
Author(s): Sohaib Akbar; Chen Yan Ding; Yousaf I; Khan H M
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.1

Abstract
A new approach for the design and operation of prepreg machinery is presented and its application to the production of E-glass/phenolic resin prepregs is described. The approach involves successive decreases in the pressure of squeezing rollers in the soaking zone and successive increases in the temperature of the drying zone. It was developed by conducting experiments into resin content, solvent content, extent of impregnation and tack and drape properties of prepregs prepared under different processing conditions. 26 refs.

Title: INTERNAL STRUCTURE AND MECHANICAL PROPERTIES OF GLASS FIBRE REINFORCED PC/ABS INJECTION MOULDINGS WITH DIFFERENT FIBRE SURFACE TREATMENTS
Page Range: p.27-33
Author(s): Mizoguchi M; Umemura T; Takasima S; Otsuki S; Bin Yang; Kuriyama T; Yew Wei Leong; Hamada H
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.1

Abstract
Three grades of commercially available glass fibres were subjected to surface treatments specially formulated and optimised to enhance the affinity of the fibre surfaces to either the polycarbonate phase, ABS phase or both phases of polycarbonate/ABS composites made therefrom and the effect of the surface treatments on the mechanical properties of the composites investigated through microstructural observations. Fibre length distribution, fibre orientation and morphological properties of the fibre-matrix interfacial regions were examined and correlated with the mechanical properties of the composites obtained by three-point bending and Charpy impact testing.

Title: SILICON-ORGANIC POLYEPOXIDES WITH EPOXY SIDE GROUPS MODIFIED WITH CHELATES
Page Range: p.35-46
Author(s): Lekishvili N; Samakashvili S; Lekishvili G
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.1

Abstract
Novel silicon-organic polyepoxides with epoxy side groups attached to the main chain were synthesised by the hydrosilylation of dihydrosiloxanes with a diallyl ether of an epoxidised glycerol. Reaction rate constants and reaction order were determined and the effect of the structure of the monomers with terminal Si-H groups on reaction rate constants, yield and properties of the polyepoxides investigated. The polyepoxides were modified with chelates containing copper, nickel, manganese and cobalt atoms in the main chain and the modified polyepoxides characterised by elemental analysis, IR spectroscopy, NMR spectroscopy, wide angle X-ray diffraction and differential scanning calorimetry. 26 refs.

Title: MOLECULARLY IMPRINTED POLYMER: USING THE TEMPLATE-MONOMER STRATEGY TOWARDS A HIGHLY SELECTIVE SORBENT
Page Range: p.47-54
Author(s): Mingxia Zheng; Songjun Li; Jianming Zhang
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.1

Abstract
The design of a molecularly imprinted polymer highly recognisable to Bisphenol A is described and the ability of polymer to discriminate Bisphenol A from its analogue, dihydroxybenzophenone, demonstrated by adsorption tests. The imprinted polymer is synthesised using Bisphenol A dimethacrylate as the polymerisable monomer and the binding framework is generated by releasing the Bisphenol A from the precursor. It is shown that adsorption by this polymer fits the Freundlich and Temkin models well but not the Langmuir model. 22 refs.

Title: NIR SPECTROSCOPY: A USEFUL TOOL FOR QUALITY CONTROL OF GLASS/PHENOLIC PREPREG MANUFACTURE
Page Range: p.55-62
Author(s): Wei Li; Yu Dong Huang; Ping Chen
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.1

Abstract
The development of a technique to control the on-line quality of glass/phenolic prepreg cloth using near-infrared (NIR) spectroscopy is reported. This was achieved by the establishment of calibration models for resin content, volatile content and degree of pre-cure using partial least squares regression and testing of several spectral pretreatments to obtain optimum models. Application of the technique to investigate the relationship between resin content, volatile content and degree of pre-cure and various processing parameters is demonstrated and quality control realised by adjusting the appropriate processing parameters. 23 refs.

Title: ELECTRICAL AND MECHANICAL PROPERTIES OF CARBON BLACK-FILLED POLY(STYRENE-CO-BUTYL ACRYLATE) LATEX REINFORCED POLYESTER NONWOVEN COMPOSITES
Page Range: p.63-69
Author(s): Satheesh Kumar M N; Siddaramaiah
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.1

Abstract
Composites for antistatic applications were fabricated by impregnating polyester non-woven fabrics with aqueous carbon black-filled poly(styrene-co-butyl acrylate) latex and the effect of the amount of carbon black on the mechanical and electrical properties of the composites investigated. Properties evaluated included tensile strength, stitch tear strength, surface hardness, percentage elongation, dielectric constant, dissipation factor and loss factor.

Title: A NEW METHOD FOR TESTING AND EVALUATING THE LONG-TERM RESISTANCE TO OXIDATION OF POLYOLEFINIC PRODUCTS
Page Range: p.71-79
Author(s): Schroeder H F; Munz M; Boehning M
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.1

Abstract
A report is presented on the development of a test for determining the long-term oxidation resistance of polyolefin materials, which is accelerated not only by elevated temperatures but also by increased oxygen pressure and a stirred aqueous medium. The method permits durability tests to be carried out at markedly lower temperatures with reasonable testing durations and significantly reduced diffusion limited oxidation effects and allows for physical and chemical impacts of aqueous media. Oxidative durability can be assessed by autoclave immersion exposures at three different temperatures (60, 70 and 80 degrees C) and 50 bar oxygen pressure and at 80 degrees C and two different oxygen pressures (usually 10 and 20 bar). Accelerated test data are evaluated by modified Arrhenius equations with the application of a three-dimensional regression analysis. The application of the test method to various materials, including PP non-woven materials and geosynthetics is demonstrated. 10 refs.

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