Day 26: Polymers. Review: Polymers vs. Metals Strength factors: What factors make polymers strong? Crystallinity Increase the chain length Here’s another one: Decrease chain flexibility. I.e. make the backbone more rigid. Here’s an example. Another Common Polymer: PolyStyrene.
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The second most commonly encountered polymer. This is a hard, yet cheap commodity plastic. Yes, it can be foamed.
This is a thermoplastic polymer.
Polybutadiene rubber chain
HIPS is strong and tough!!
Side group is not as bulky as the one in PS.
Regular side group placement: up to 60% crystallinity
Irregular side group placement: amorphous
Though PE is more crystalline, it is easier to get PP to form these fibers. Yes, PE fibers are great. (Spectra) But not as economically viable as PP fibers. Nylon, which will be discussed soon is well known for forming fibers.
Lots of PP fiber used in clothing. I.e. mountain climbing thermal underwear.