Back SearchTitle: VISCOELASTIC PROPERTIES OF FOAMED THERMOPLASTIC VULCANIZATES AND THEIR DEPENDENCE ON VOID FRACTION
Page Range: p.137-156
Author(s): Park J; Siegmund T; Mongeau L
File size: 176K
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Issue Year: cp
Volume: 22
Issue No: No. 3
Abstract
An investigation was carried out to determine the viscoelastic properties of Santoprene foamed thermoplastic vulcanisates having a range of void fractions from 0.0 to 0.7 and extruded into rods of rectangular cross-section using water, as the blowing agent. Relaxation tests were performed along the extrusion direction and in the direction perpendicular to extrusion and high frequency data for longitudinal elastic modulus and loss factor were obtained in the frequency range from 50 Hz to 2 kHz. The data obtained were compared with predictions for porous solids using various micromechanics models. 20 refs.
Title: NOVEL REDUCED DENSITY MATERIALS BY SOLID-STATE EXTRUSION: PROOF-OF-CONCEPT EXPERIMENTS
Page Range: p.157-174
Author(s): Schirmer H G; Kumar V
File size: 89K
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Issue Year: cp
Volume: 22
Issue No: No. 3
Abstract
Two different approaches for producing a thermoplastic analogue to mud employing a low-temperature extrusion process, in which solid particles of one polymer are carried and compacted in a matrix of a lower melting point second polymer, are reported. In the first approach, prefoamed and plain PVC pellets are coated with a plasticiser and dusted with flexible PVC powder prior to extrusion. In the second approach, co-extruded hollow pellets with a stiff PS portion encapsulated with a softer lower melting point PE or ethylene-methacrylate copolymer portion are foamed and extruded into a rod, which retains its cellular structure. 9 refs.
Title: EFFECT OF KEY PROCESS VARIABLES ON MICROSTRUCTURE OF INJECTION MOLDED MICROCELLULAR POLYSTYRENE FOAMS
Page Range: p.175-190
Author(s): Kawashima H; Shimbo M
File size: 175K
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Issue Year: cp
Volume: 22
Issue No: No. 3
Abstract
The results are reported of a study of the effects of various processing factors on the cell morphology of injection moulded microcellular styrene polymers. Factors investigated included injection velocity, mould temperature, dwell time, plunger stroke and dwell pressure. Foaming was carried out in a screw preplasticising injection moulding machine. 14 refs.