Back SearchTitle: GAS SOLUBILITY IN AND FOAMABILITY OF VARIOUS FORMS OF SYNDIOTACTIC POLYSTYRENE
Page Range: p.241-253
Author(s): Handa Y P; Zhang Z; Nawaby V; Tan J
File size: 111K
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Issue Year: cp
Volume: 20
Issue No: No. 4
Abstract
The results are reported of a study of the solubility of carbon dioxide in amorphous, meso and alpha-crystalline forms of syndiotactic PS carried out using a high pressure microbalance at 35C and pressures up to 55 atm. The styrene polymers were foamed at temperatures ranging from 50 to 295C and the density and morphological properties of the resulting microcellular polymers determined. The effects of morphology on gas sorption and on the foams are discussed and the role of microvoids as nucleating sites in the foams is considered. 13 refs.
Title: CROSSLINKING OF POLYOLEFIN FOAMS. I. EFFECT OF TRIALLYL CYANURATE ON DICUMYL PEROXIDE CROSSLINKING OF LOW-DENSITY POLYETHYLENE
Page Range: p.255-277
Author(s): Sims G L A; Sipaut C S
File size: 125K
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Issue Year: cp
Volume: 20
Issue No: No. 4
Abstract
The results are reported of a study of the dicumyl peroxide (DCP) crosslinking of two LDPEs having similar number-average molec.wts. but different molecular weight distribution and of the effect of triallyl cyanurate (TAC) on the crosslinking of these polymers. The effects of a) MWD on gel content, b) DCP concentration on gel content using a fixed concentration of TAC, c) TAC concentration on gel content using a fixed concentration of DCP, d) varying DCP concentration on melt behaviour, e) crosslinking systems containing TAC on melt behaviour, f) increasing DCP concentration on foam density and cell size for traditional crosslinking systems and g) TAC on foaming behaviour are discussed. 23 refs.
Title: INVESTIGATION INTO CLAIMS THAT TOLUENE DIAMINE IS PRESENT IN POLYURETHANE FLEXIBLE FOAMS
Page Range: p.279-293
Author(s): Hillier K; King D; Kronborg-Hansen A; Schupp T
File size: 40K
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Issue Year: cp
Volume: 20
Issue No: No. 4
Abstract
An investigation was carried out into claims made in Scandinavia that flexible PU foams may be a health hazard because they may contain traces of TDA or small amounts of TDA may form upon ageing. Tests carried out on a wide range of foams, including fresh cured foams and foams subjected to heat ageing, autoclaving and humid environments revealed no evidence for the presence of free toluene diamine. Some reasons for the erroneous reporting of TDA in PU foams are suggested. 5 refs.