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Results tagged with plastics
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user 4231
For questions relating to the structures, properties, production methods and potential hazards of polymer materials commonly known as plastics
18
votes
Accepted
Why do many transparent plastics turn opaque when deformed?
The process of forming an opaque area when you apply stress to a polymer film is known as crazing.
Polymers are long chains and, when coated, often form tangled, amorphous, randomly aligned polymer r …
- 85.4k
3
votes
What is the plastic material of the CD cases?
CD jewel cases are made from injection molded polystyrene. Clam-shell alternatives use polypropylene.
- 85.4k
5
votes
Accepted
The walls of a plastic vial with Mercury inside are darkening. What is causing this?
Mercury doesn't react with PET under normal conditions, but mercury vapor will diffuse into plastics. … One final point, plastics are sometimes contaminated with small amounts of various impurities. …
- 85.4k
25
votes
Accepted
Ripping apart plastic: is this a chemical or physical change?
When you rip, tear or mechanically deform a polymer (for example a piece of plastic) you are putting energy into the material. The energy from this deformation causes the polymer chains in the vicini …
- 85.4k