Back SearchTitle: EFFECTS OF CHLORINE DEPLETION OF ANTIOXIDANTS IN POLYETHYLENE
Page Range: p.1-14
Author(s): Dear J P; Mason N S
File size: 2131K
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Issue Year: ppc
Volume: 9
Issue No: No. 1
Abstract
The effects of chlorine on the depletion of antioxidants used in PE water distribution and water treatment pipes is examined. A research method was devised which subjected PE pipes to pressurised chlorinated water until they failed or survived the test period. After failure or at the end of the test, the changes in properties of 2 mm thick specimens from the inner wall were studied. Evaluations included both different pressures and the degree of chlorine concentration in the water. 8 refs.
Title: STRESS ANALYSIS OF FAILURES IN CORD-RUBBER COMPOSITES
Page Range: p.15-24
Author(s): Pidaparti R M V; May A W
File size: 1262K
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Issue Year: ppc
Volume: 9
Issue No: No. 1
Abstract
Stress analysis of failures in the form of cracks due to fatigue of cord-rubber composites was carried out using micromechanical 2D and 3D finite element analysis. The von Mises-Tresca stresses were computed from the results of finite element analysis and compared. Results show that crack type, loading and crack size have a strong effect on the values of the von Mises-Tresca stress. Use of the results of the von Mises-Tresca stress should help in estimating the severity of local failures in cord-rubber composites, it is proposed. 12 refs.
Title: INFLUENCE OF MATRIX MODIFICATION ON THE SOLID PARTICLE EROSION OF GLASS/EPOXY COMPOSITES
Page Range: p.25-30
Author(s): Kulkarni S M; Kishore
File size: 2315K
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Issue Year: ppc
Volume: 9
Issue No: No. 1
Abstract
Solid particle erosion is studied of glass fibre reinforced epoxy resins, in which the matrix is modified with the incorporation of either carbon black filler or a rubber material known to enhance toughness. A study was also made in which both materials are simultaneously included in the resinous matrix. The objective of the study was to determine the affect of this matrix modification on the semi-ductile behaviour of the thermoset matrix. The erosion weight loss was studied with respect to the angle of impingement, and eroded surfaces of test samples were examined under SEM to observe fracture features. For a matrix containing carbon, the angle for peak erosion remained at 45 degrees despite variations in filler content, but in the case of a rubber-toughened matrix, a shift of this angle to 30 degrees is observed, which suggests, it is proposed, a change in the mechanism of material removal. When carbon filler was added to the rubber-toughened matrix, it appeared to influence erosion behaviour. 12 refs.
Title: EFFECTS OF ATBN RUBBER ADDITIONS ON THE FRACTURE TOUGHNESS OF UNSATURATED POLYESTER RESIN
Page Range: p.31-36
Author(s): Miller N A; Stirling C D
File size: 1401
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Issue Year: ppc
Volume: 9
Issue No: No. 1
Abstract
The effects are studied of the addition of liquid amine-terminated butadiene-acrylonitrile (ATBN) on the fracture toughness of both an unsaturated polyester resin and unidirectional glass fibre reinforced composite materials. The effects of different rubber concentrations on the fracture toughness of the resin were determined using the single edge notch beam test. An interlaminar fracture toughness test was used to determine the effects of the toughened resin on the fracture toughness of the composites. The addition of ATBN to the polyester resin resulted in the formation of large agglomerates, consisting of a mixture of ATBN rubber and the base resin, rather than the expected discrete droplets of ATBN rubber. The increased interlaminar fracture toughness of the rubber modified resin is considered to be due to a combination of localised bonding between rubber/resin agglomerates and the glass fibres, and the lower tensile strength and flexural modulus of the rubber modified resin. 6 refs.
Title: VARIABLES INVOLVED IN THE MANUFACTURE OF SPECIALITY ANTIOXIDANT MASTERBATCHES FROM LINEAR POLYETHYLENE
Page Range: p.37-40
Author(s): Rangaprasad R; Vasudeo Y B
File size: 399K
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Issue Year: ppc
Volume: 9
Issue No: No. 1
Abstract
This paper addresses some of the issues involved in the preparation of an antioxidant masterbatch designed to be incorporated into HDPE. A systematic study is made of the effect of variables involved in the manufacture of the antioxidant masterbatch which were identified as: the effect of density of linear PE on additive loading, the effect of MFI of linear PE on antioxidant loading and compounding, the effect of co-antioxidants in the masterbatch on the final PE properties after let down, the effect of the type of compounding machine used and shear factor on the product quality, and the effect of the quality of the antioxidant powder on masterbatch production. The best 20% masterbatch was obtained when a carrier resin having a density of 0.924g/cc and MFI 6.5g/10 min. is used.
Title: POLYIMIDES CONTAINING S-TRIAZINE RINGS
Page Range: p.41-50
Author(s): Patel H S; Patel V C
File size: 553K
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Issue Year: ppc
Volume: 9
Issue No: No. 1
Abstract
A description is given of the synthesis and characterisation of poly(imino-1,3,5-triazine imide)s. A novel approach was used to prepare a matrix system for processable poly(imino-1,3,5-triazine imide)s glass fibre reinforced composites based on the in-situ Diels Alder intermolecular addition polymerisation of 2,6-bis(2-furanyl methyl imino)-4-in-propoxy-1,3,5-triazine and bis(maleimide)compounds. The composites were characterised by chemical resistivity and mechanical properties. 19 refs.
Title: ENTROPIC MECHANISM OF WATER SOLVATION BY POLYMERS
Page Range: p.51-61
Author(s): Mikheev Y A; Zaikov G E
File size: 501K
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Issue Year: ppc
Volume: 9
Issue No: No. 1
Abstract
Mathematical analysis of isotherms of the equilibrium water absorption of polymers displays their consistency with the equation for the theory of volume-centred filling of micropores, regardless of the hydrophilicity of the polymers. The structure of a microporous adsorbent, absent in the initial state, is formed in consequence of the reorganisation of chains of a molecular chain sponge during adsorption. Thus, some chain units combine to isolate water molecules as clusters, and another part is redistributed around the clusters as a fringe that stabilises the system by increasing the configurational entropy. 35 refs.