Back SearchTitle: TENSILE MODULUS PREDICTION OF STRUCTURAL FOAMS USING DENSITY PROFILES
Page Range: p.285-301
Author(s): Barzegari M R; Rodrigue D
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Issue Year: cp
Volume: 27
Issue No: No.5
Abstract
The preparation of low density polyethylene foams with different density profiles via compression and injection moulding using a modified azodicarbonamide as chemical blowing agent, and their characterisation by optical microscopy (foam morphology), X-ray densitometry (density profile) and tensile modulus, is described. The development of a mathematical model for cellular materials which incorporates the complete density profile is presented, and its application to the prediction of tensile modulus of structural foams based on density profile is discussed. 34 refs.
Title: EFFECT OF AS-MOLD RAPID COOLING ON SHRINKAGE AND MORPHOLOGY OF CORE REGION OF INJECTION MOLDED PARTS USING MICROCELLULAR FOAMING PROCESS
Page Range: p.303-312
Author(s): Zafar R; Kim H B; Jeon B J; Cha S W
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Issue Year: cp
Volume: 27
Issue No: No.5
Abstract
The shrinkage and morphology of the core region of injection moulded acetal copolymer components using the microcellular foaming process with supercritical nitrogen as foaming agent was investigated under normal cooling and as-mould rapid cooling conditions as a function of increased weight reduction, with analysis of the products by DSC and SEM. The results are discussed in terms of the effects of weight reduction, crystallinity and cooling rate on the degree of shrinkage. 10 refs.
Title: PREDICTION OF THE EFFECTIVE THERMAL CONDUCTIVITY OF GRAPHITIC FOAM USING A FRACTAL MODEL
Page Range: p.313-321
Author(s): Xu Z; Wang Y; Wang Y
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Issue Year: cp
Volume: 27
Issue No: No.5
Abstract
The development of a mathematical model based on fractal theory for the prediction of the effective thermal conductivity of graphitic foam, prepared by thermal treatment of mesophase pitch under certain conditions of temperature and pressure, is described. Thermal conductivity was calculated by determination of the area fractal dimension of the foam and application of the thermal resistance method, and the results are discussed in comparison with experimental data. 16 refs.