Analysis of Plastics, Vol. 13 (2002)(en)(160s) by M.J. Forrest

By M.J. Forrest

This evaluation outlines every one procedure utilized in plastics research after which illustrates which tools are utilized to acquire a specific end result or piece of compositional info. for instance, polymer and filler identity, molecular weight selection, antidegradant quantification and floor research research tools are all incorporated. round four hundred abstracts from the Rapra Polymer Library database accompany this overview, to facilitate extra examining.

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Phosphorus) on the unextracted sample. The extract value itself will rarely provide a meaningful quantification as other species, particularly any process aid/plasticiser, will contribute to it as well. , organophosphates) it may be possible to use an HPLC analysis of the extract to quantify the flame retardant. GC based techniques can also be used in some cases, but bromide types present problems for these techniques because of their relatively high molecular weights (> 900). , antimony trioxide) can react with the organic flame retardant present, or break down to produce volatile products, under quantitative ashing conditions, and during analysis by thermal techniques such as TGA.

A surprisingly large number of failure problems can be solved by carrying out a simple series of tests including a polymer identification check by IR, a bulk compositional analysis by TGA and a molecular weight determination. Molecular weight determination is very important in the case of plastics because of the wide use (sometimes unauthorised) of regrind material. Unfortunately, the quality of regrind plastic can vary greatly due to the degradation, and hence reduction in molecular weight and associated physical properties, that a plastic undergoes when it is reground.

It is often the case that complementary surface analysis techniques such as SIMS and XPS can be used together in order to successfully solve a failure or characterisation problem. In such cases, XPS would be used to generate quantitative information, whilst SIMS would provide qualitative clues with respect to the chemistry. , it could be silica, silicate or silicone. Analysis of the same surface by static SIMS enables the mass spectrum of the sputtered top layer fragments to be determined and the presence of m/e ions at 43, 73 and 147 confirm that a polydimethyl siloxane is present.

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