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Polymers and Polymer Composites

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Title: VISCOELASTIC PROPERTIES OF POLYETHYLENE SYNTACTIC FOAM WITH POLYMER MICROBALLOONS
Page Range: p.227-238
Author(s): Lawrence E; Pyrz R
File size: 1205K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 4

Abstract
The use is investigated of polymeric microballoons in place of glass microballoons for the manufacture of polyethylene syntactic foams. Whilst glass microballoons have good mechanical and thermal properties, they are subject to breaking and shearing during processing. This present study deals with the viscoelastic properties of extruded PE and a foam made from PE and approximately 40 volume percent of polymer microballoons. Results are discussed of creep tests and stress relaxation tests. 6 refs.

Title: HYDROLYSIS OF KEVLAR FIBRES
Page Range: p.239-246
Author(s): Lin J-S; Chiu H-T
File size: 1138K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 4

Abstract
To overcome the problems of debonding of Kevlar fibres when used as reinforcement in composites, surface modification is necessary. The use of hydrolysis is examined as a technique to improve the interfacial bonding between the reinforcement and the polymer matrix. Kevlar fibres were hydrolysed in a concentrated aqueous solution of either sulphuric acid or sodium hydroxide and then characterised by measuring the tensile strength and the interlaminar shear strength. The active sites on the hydrolysed surface were determined by the dyeing-decolourising method. 20 refs.

Title: TRANSPORT OF WATER THROUGH POLYAMIDE-NITRILE RUBBER BLENDS AND ITS INFLUENCE ON MECHANICAL PROPERTIES
Page Range: p.247-256
Author(s): Kumar C R; Francis B; Thomas S
File size: 930K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 4

Abstract
A study is reported of the transport of water through polyamide-nitrile rubber blends with respect to the effect of water absorption on the mechanical properties of the blend. The diffusion of water through the blends was investigated at various temperatures. It was established that the temperature dependence of the diffusion characteristics indicated that the transport mechanism varied with the composition of the blend, its morphology and temperature. In all cases, the diffusion mechanism followed a Fickian trend. Mechanical properties such as tensile strength, modulus and yield stress of PA and blends were found to decrease due to the water uptake. 25 refs.

Title: PROPERTIES OF METAL FIBRE FILLED THERMOPLASTICS AS CANDIDATES FOR ELECTROMAGNETIC INTERFERENCE SHIELDING
Page Range: p.257-262
Author(s): Tan S T; Zhang M Q; Rong M Z; Zeng H M; Zhao F M
File size: 495K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 4

Abstract
Polypropylene based conductive composites were produced using stainless steel fibres as the fillers, and tests were carried out to determine the electrical conductivity, mechanical properties and EMI shielding effectiveness of the composites. The incorporation of stainless steel fibres into PP resulted in inferior mechanical properties, but increased conductivity. Using a blend of PP and PP-g-maleic anhydride instead of PP as the matrix, proved to be effective in balancing the overall properties and meeting the requirements of EMI shielding materials. 13 refs.

Title: RHEOLOGICAL AND MECHANICAL PROPERTIES OF GUM AND FILLED BLENDS OF ACRYLATE RUBBER AND FLUORORUBBER
Page Range: p.263-274
Author(s): Kader M A; Bhattacharyya A K; Bhowmich A K
File size: 2157K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 4

Abstract
A report is presented of results of an investigation into the processability of gum and filled acrylate rubber, fluorocarbon rubber and their blends. The rheological study is carried out at various shear rates and temperatures, and the rheological and viscoelastic properties of these unfilled and filled blends are correlated with blend composition and with the nature and loading of filler. 22 refs.

Title: METALLIC METHACRYLATE AS A REACTIVE FILLER TO REINFORCE ETHYLENE-PROPYLENE-DIENE RUBBER
Page Range: p.275-282
Author(s): Peng Z; Zhang Y; Liang X; Zhang Y
File size: 471K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 4

Abstract
Non-polar EPDM was reinforced by the addition of polar metal salts of methacrylic acid at a high level, followed by peroxide curing. Mechanical properties and crosslink density of the vulcanisates were investigated. Wide-angle X-ray diffraction and FTIR were used to analyse the reactivity of zinc dimethacrylate (ZDMA) in EPDM compounds pre- and post-vulcanisation. It was found that ZDMA or magnesium dimethacrylate can greatly improve the hardness and tensile strength of the vulcanisates whilst retaining a high elongation at break, and that it acts as a reactive filler in the EPDM matrix during peroxide curing. Crosslink density was determined by equilibrium swelling. Covalent crosslinks and ionic crosslinks were distinguished by acidolysis treatment. Ionic crosslinks were improved by increasing the amount of ZDMA, and the relationship between mechanical properties and crosslink density are claimed to indicate that the tensile strength of the vulcanisate is principally dependent on ionic crosslink density. 19 refs.

Title: EPOXY BASED THERMAL STABILISER FOR POLY(VINYLCHLORIDE)
Page Range: p.283-290
Author(s): Patel P G; Patel G R; Parmar J S
File size: 462K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 4

Abstract
A tetrafunctional epoxy resin was evaluated as a thermal stabiliser for use in PVC compounds. Its stabilising efficiency was tested by yellowness index, HCl liberation, UV absorption, induction time, and changes in the mechanical properties. It was demonstrated that epoxy resins with several epoxy groups are effective in stabilising PVC against dehydrochlorination during processing and use, compared with tribasic lead sulphate. 35 refs.

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