Back SearchTitle: MICROCELLULAR WOOD FIBRE REINFORCED POLYPROPYLENE COMPOSITES IN AN INJECTION MOULDING PROCESS
Page Range: p.417-429
Author(s): Bledzki A K; Faruk O
File size: 193K
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Issue Year: cp
Volume: 21
Issue No: No. 6
Abstract
Composites of PP and various amounts of wood fibre were prepared using a chemical blowing agent (azodicarbonamide) and a maleic anhydride-propylene copolymer coupling agent by injection moulding. Tests were carried out to determine the density, cell size, void content, tensile properties, flexural properties and water absorption of these composites and the shape and distribution of the voids in the composites analysed by reflected light microscopy. Scanning electron microscopy was employed to determine average cell size, fibre dispersion and the quality of the bond between the fibres and PP matrix. 12 refs.
Title: STUDIES OF MECHANICAL PROPERTIES AND MELTING BEHAVIOUR OF FOAMED AND CROSSLINKED LDPE/PP BLENDS
Page Range: p.431-443
Author(s): Kotzev G
File size: 128K
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Issue Year: cp
Volume: 21
Issue No: No. 6
Abstract
Foamed and crosslinked blends of LDPE and PP were prepared by reaction injection moulding using, as the crosslinking system, 2,5-dimethyl-2,5-di(tert.butylperoxy)hexane (initiator) and hydroquinone (coagent), and azodicarbonamide, as blowing agent. The density, gel content, tensile properties, impact properties, melting behaviour and cell structure of these foamed blends were determined and the effect of the crosslinking system on the properties of the foams evaluated. 12 refs.
Title: THE INFLUENCE OF MELT ELONGATIONAL PROPERTIES ON THE MORPHOLOGY OF PES CELLULAR MATERIALS
Page Range: p.445-453
Author(s): Woellecke F; Altstaedt V; Sandler J; Rakutt D
File size: 132K
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Issue Year: cp
Volume: 21
Issue No: No. 6
Abstract
The suitability of polyethersulphone for foaming applications was investigated through melt elongation and elongation at break measurements. The influence of the molec.wt. of the polyethersulphone on elongational behaviour was evaluated on a laboratory scale and correlated with the morphology of foams produced by a batch process. It was found that it was possible to determine the influence of molec.wt. on morphology for a given blowing agent content and to tailor the density, morphology and compression properties of the foams by varying the amount of blowing agent employed. 9 refs.