Back SearchTitle: MASS TRANSPORT OF CELL GASES IN CARBON DIOXIDE BLOWN PET (POLYETHYLENE TEREPHTHALATE) FOAM INSULATION
Page Range: p.115-126
Author(s): Mangs S; Ramnas O; Jarfelt U
File size: 233K
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Issue Year: cp
Volume: 24
Issue No: No. 3
Abstract
The diffusion coefficients and activation energies of cell gases in two carbon dioxide blown PETP foams having different densities and thicknesses were determined at temperatures between 23 and 90C. Thermal conductivities of the foams at different temperatures were also determined and cell gas conductivities calculated to determine contributions of the different mechanisms in the foams. The thermal ageing of the foams due to mass transport of air into and blowing agent out of the foam was compared with that of carbon dioxide blown PU foam and the possibility of using PETP foam as a replacement for PU foam as thermal insulation in district heating pipes considered. 21 refs.
Title: DESIGN OF AN ARTIFICIAL INTERVERTEBRAL DISC EXHIBITING A NEGATIVE POISSON'S RATIO
Page Range: p.127-138
Author(s): Martz E O; Lakes R S; Goel V K; Park J B
File size: 240K
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Issue Year: cp
Volume: 24
Issue No: No. 3
Abstract
The design and characterisation of an artificial intervertebral lumbar disc, which incorporates a negative Poisson's ratio to eliminate problems of bulge and reasonable compliance in bending and torsion, are described. Finite element analysis was employed to refine the design of the disc and compressive stiffness and Poisson's ratio predicted thereby verified by testing HDPE implants with an inverted honeycomb structure. 23 refs.
Title: CHARACTERIZATION OF EVA RESIDUES FROM THE SHOE INDUSTRY AND POST-CONSUMER URBAN-WASTE POLYETHYLENES
Page Range: p.139-158
Author(s): Zattera A J; Bianchi O; Oliveira R V B; Canto L B; Ferreira C A; Zeni M
File size: 482K
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Issue Year: cp
Volume: 24
Issue No: No. 3
Abstract
The molecular structure, tensile properties, impact properties, morphologies, thermal properties and dynamic mechanical properties of crosslinked cellular EVA residues from the shoe industry and post-consumer PE waste were determined. Investigative techniques employed included FTIR spectroscopy, mechanical testing, scanning electron microscopy and DMTA. The properties of these scrap polymers were compared with those of the virgin polymers. 22 refs.