Write an activity (hot pin test) to identify whether a given plastic is thermoplastic or thermosetting plastic
Answers
Answer:
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Explanation:
To initially determine whether a material is thermoset or thermoplastic, heat a stirring rod (to about 500° F) and press it against the sample. If the sample softens, the material is a thermoplastic; if not, it is probably thermosetting. Next, hold the sample to the edge of a flame until it ignites.
Plastics are high molecular weight (macromolecular or polymeric) organic
substances that have usually been synthesized from low molecular weight
compounds. They may also have been obtained by chemical modifi cation of
high molecular weight natural materials (especially cellulose). The raw
materials are most o en petroleum, natural gas, and coal. They can be
reacted with air, water, or sodium chloride to prepare reactive monomers.
The most important industrial synthetic processes for the preparation of
plastics from monomers may be classifi ed according to the mechanism of
the formation reaction of the polymer, such as polymerization and condensation reactions. Since several chemically identical or similar plastics can
be prepared in several diff erent ways and from diff erent raw materials, this
classifi cation has little meaning for the analysis of unknown plastics samples. On the other hand, in addition to chemical investigations, the appearance of a plastic as well as its behavior on heating yields useful information