Back SearchTitle: COMPRESSION MOLDING OF POLYETHYLENE FOAMS UNDER A TEMPERATURE GRADIENT: MORPHOLOGY AND FLEXURAL MODULUS
Page Range: p.237-248
Author(s): Barzegari M R; Jiaolian Yao; Rodrigue D
File size: 283K
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Issue Year: cp
Volume: 28
Issue No: No.4
Abstract
Density graded PE foams were prepared by imposing a temperature gradient during foaming. This was achieved by controlling independently the top and bottom plates of a compression mould at different temperatures. The effects of blowing agent (Expancel 950 DU 80) concentration, plate temperature and waiting time on foam morphology, density profile and flexural modulus were investigated and the density profiles obtained discussed. 12 refs.
Title: CELLULAR STRUCTURE OF HALOGEN-FREE FLAME RETARDANT FOAMS BASED ON LDPE
Page Range: p.249-268
Author(s): Roman-Lorza S; Rodriguez-Perez M A; De Saja Saez J A
File size: 750K
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Issue Year: cp
Volume: 28
Issue No: No.4
Abstract
Foamed LDPE composites containing up to 70 wt.% of alumina trihydrate were produced in a compression moulding machine using azodicarbonamide as blowing agent and LLDPE-g-maleic anhydride as compatibiliser. The cellular structure and morphology of the foam composites were characterised by scanning electron microscopy and foam composite mechanical properties, heat stability and combustion behaviour investigated by compression testing, TGA, limiting oxygen index measurements and bomb calorimetry. The effect of filler volume fraction on foam cellular structure was evaluated and the relationship between foam composite structure and properties examined. 28 refs.
Title: IMPROVING THE IMPACT BEHAVIOUR OF STRUCTURAL FOAMS
Page Range: p.269-287
Author(s): Michaeli W; Florez L; Obeloer D; Brinkmann M
File size: 567K
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Issue Year: cp
Volume: 28
Issue No: No.4
Abstract
Different foam morphologies with systematic variations in the parameters of foam density, mean cell size and skin thickness were prepared by physical foaming of PBTP and polycarbonate and the impact properties of the foams investigated by instrumented puncture testing. Force versus displacement curves were obtained for each foam material and the properties of maximum impact force and energy absorbed correlated with the morphological parameters of skin thickness, cell size and foam density. 15 refs.
Title: STRUCTURAL CHARACTERIZATION AND MECHANICAL BEHAVIOUR OF LDPE STRUCTURAL FOAMS. A COMPARISON WITH CONVENTIONAL FOAMS
Page Range: p.289-302
Author(s): Escudero J; Solorzano E; Rodriguez-Perez M A; Garcia-Moreno F; De Saja J A
File size: 333K
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Issue Year: cp
Volume: 28
Issue No: No.4
Abstract
Structural LDPE foams and conventional foams of the same density and chemical composition were produced using an alternative process to injection moulding. The structural and mechanical properties in tension, compression and bending of both types of foam were investigated and compared. The structural foams possessed better flexural properties than the conventional foams. No improvements in tensile and compression properties were found. 20 refs.