By M.J. Forrest
This evaluation outlines every one process utilized in plastics research after which illustrates which tools are utilized to procure a selected consequence or piece of compositional info. for instance, polymer and filler id, molecular weight choice, antidegradant quantification and floor research learn equipment are all incorporated. round four hundred abstracts from the Rapra Polymer Library database accompany this overview, to facilitate extra interpreting.
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Additional resources for Analysis of Plastics, Vol. 13 (2002)(en)(160s)
Less than 1% or at ppm levels) can sometimes be important, for example if a product is to be used in the pharmaceutical industry. If it is suspected that the contaminant is, or contains, a metal, then AAS can be employed. If the presence of an organic molecule is suspected, then headspace GC-MS can be used to identify and quantify the species. The high sensitivity of this technique normally makes the use of a control sample extremely important for a quick interpretation of the output, which is often complex.
Examples include azo compounds, nitroso compounds, sulfonyl hydrazide compounds and sodium bicarbonate. , dichloromethane or pentane) which volatilise at the processing temperature to create a cellular structure. With plastics, the most widely used type are the physical blowing agents. Where it is suspected that a physical type blowing agent has been used to produce a foam, is it possible to use headspace GC-MS to identify it. Even in the blown state, the high sensitivity of the technique enables an assignment to be made from the small amount of residual blowing agent that will be present.
In common with the other surface analysis techniques, it can also be used to investigate surface contamination problems and to determine the composition of the fracture surfaces in adhesion failures. 2 Laser Induced Mass Analysis (LIMA) In the LIMA technique, the surface of the sample is subjected to a pulsed UV laser which is sufficiently energetic to volatilise a small volume (about 1 μm cube) of material. The ionised fragments in this volume are then separated and identified by means of a time of flight mass spectrometer.
Analysis of Plastics, Vol. 13 (2002)(en)(160s) by M.J. Forrest