Back SearchTitle: TITANATE AND ZIRCONATE COUPLING AGENTS IN FOAMED POLYMERS
Page Range: p.149-187
Author(s): Monte S J
File size: 3402K
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Issue Year: cp
Volume: 20
Issue No: No. 3
Abstract
A review of the literature on titanate and zirconate coupling agents in foamed polymers is presented. Aspects covered include titanate and zirconate filler and polymer modification (coupling and catalysis effects in foamed polymers), documentation of efficacy, coupling agent mechanisms (the way they react with foamed polymer compound ingredients and blowing agents), applications methodology, examples of results, and transparent, permanent, non-blooming and non-moisture dependent antistatic polymers. 36 refs.
Title: VISCOELASTIC-PLASTIC BEHAVIOUR ANALYSIS OF EXPANDED POLYSTYRENE UNDER COMPRESSIVE LOADING: EXPERIMENTS AND MODELLING
Page Range: p.198-209
Author(s): Imad A
File size: 1835K
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Issue Year: cp
Volume: 20
Issue No: No. 3
Abstract
Experimental, rheological modelling and numerical calculation studies were conducted on expanded PS(EPS) under compressive loading. It was found that the mechanical behaviour of this material under compression was mainly governed by the apparent density value. When this physical parameter increased, the modulus and the yield stress value also increased according to a power function. The densification strain, however, decreased. Experimental results on compression and relaxation tests showed that EPS could be described by viscoelastic-plastic behaviour. The rheological model based on a superposition between a viscoelastic and elastic-plastic branches correctly described the EPS stress-strain curve, even if the parameter set was not unique. Using CASTEM 2000 software, numerical calculations led to a good simulation of the compressive tests and compression followed by relaxation tests on EPS cubic specimen. This approach should allow the use of numerical calculation for EPS lightweight fill structure optimisation. 23 refs.
Title: RESEARCH INTO THE CAUSES OF FIRE - SEARCHING FOR NEW INSIGHT OR CONFIRMING OLD PREJUDICES?
Page Range: p.211-229
Author(s): Prager F H; Sasse R H
File size: 874K
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Issue Year: cp
Volume: 20
Issue No: No. 3
Abstract
The course of the 1996 fire at Dusseldorf airport is discussed with reference to the report by the expert commission. Polymeric materials involved included expanded PS and PVC. A detailed analysis of the report reveals that there is reason to doubt the conclusions reached concerning ignition risk and the initial phase of the fire. In addition, there are marked inconsistencies between material-specific and test-based knowledge on the one hand and the conclusions and recommendations arrived at on the other. The role of the insulation in the suspended ceiling (interlevel) area, classified as non-combustible, was incorrectly assessed in practically every respect. A risk-focussed identification of the potential origin of the fire is considered and the relevance of purely material-specific data is highlighted. 36 refs.