By M.J. Forrest
This overview outlines every one approach utilized in plastics research after which illustrates which equipment are utilized to procure a specific end result or piece of compositional info. for instance, polymer and filler identity, molecular weight selection, antidegradant quantification and floor research examine equipment are all integrated. round four hundred abstracts from the Rapra Polymer Library database accompany this evaluate, to facilitate additional examining.
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Extra info for Analysis of Plastics
Antioxidants which have high boiling points cannot be directly by GC but they can be analysed as derivatives such as acetates, trifluoroacetates, trimethyl silyl-ethers, methyl ethers, etc. 10). Benchtop LC-MS instruments are proving to be excellent tools in the analysis of plastics of unknown composition to identify and, once this is achieved, quantify the antioxidant present. Prior to the advent of LC-MS it was very difficult to use conventional HPLC for this task because of the large range of possible compounds.
A review of the environmental stress cracking of plastics has been produced by Wright (315). , mixing, extruding or moulding). More often than not this contamination is in the form of solid, discreet entities which makes their removal from the product relatively easy. Once removed the microscopic techniques IR and Edax are excellent at obtaining assignment data in a cost effective way. , 1 mg), and if a mixture of chemicals is suspected, a bulk composition by TGA can be obtained. If identification problems are still occurring, more sophisticated techniques such as GC-MS, SIMS and LIMA can be employed.
5 μm and the detection limit 10-100 ppm. The technique has the ability to detect all of the elements in a qualitative way. , by handling without gloves) and that the representative control samples are available to assist in the interpretation of the data. Its sensitivity and surface specificity make it ideal in the detection of very low levels of contamination/ modification. For example, the detection of a monolayer of silicone contamination of a plastic part that was hampering the wetting of a paint.