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A polymer (; Greek poly-, "many" + -mer, "part") is a large molecule, or macromolecule, composed of many repeated subunits. Due to their broad range of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. Polymers range from familiar synthetic plastics such as polystyrene to natural biopolymers such as DNA and proteins that are fundamental to biological structure and function. Polymers, both natural and synthetic, are created via polymerization of many small molecules, known as monomers. Their consequently large molecular mass, relative to small molecule compounds, produces unique physical properties including toughness, viscoelasticity, and a tendency to form glasses and semicrystalline structures rather than crystals. The terms polymer and resin are often synonymous with plastic.
The term "polymer" derives from the Greek word πολύς (polus, meaning "many, much") and μέρος (meros, meaning "part"), and refers to a molecule whose structure is composed of multiple repeating units, from which originates a characteristic of high relative molecular mass and attendant properties. The units composing polymers derive, actually or conceptually, from molecules of low relative molecular mass. The term was coined in 1833 by Jöns Jacob Berzelius, though with a definition distinct from the modern IUPAC definition. The modern concept of polymers as covalently bonded macromolecular structures was proposed in 1920 by Hermann Staudinger, who spent the next decade finding experimental evidence for this hypothesis.Polymers are studied in the fields of biophysics and macromolecular science, and polymer science (which includes polymer chemistry and polymer physics). Historically, products arising from the linkage of repeating units by covalent chemical bonds have been the primary focus of polymer science; emerging important areas of the science now focus on non-covalent links. Polyisoprene of latex rubber is an example of a natural/biological polymer, and the polystyrene of styrofoam is an example of a synthetic polymer. In biological contexts, essentially all biological macromolecules—i.e., proteins (polyamides), nucleic acids (polynucleotides), and polysaccharides—are purely polymeric, or are composed in large part of polymeric components—e.g., isoprenylated/lipid-modified glycoproteins, where small lipidic molecules and oligosaccharide modifications occur on the polyamide backbone of the protein.The simplest theoretical models for polymers are ideal chains.

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  1. C

    Washington  Polymer 80 legality in WA state

    Hello everyone, I was curious if anyone knows for sure if it is still legal for someone to purchase and build a Polymer 80 kit for personal use in WA state? I've been eyeballing things on 80p Builder, but I am concerned because I know a law passed awhile back that I think pertains to these. Thanks
  2. 40isforme

    Polymer 80 glock lemons

    Just to be clear I am not bashing polymer 80, I have not yet reached out to customer service about this but I need to vent. I have gotten two frames from them so far and both have not worked out! Wont lie im a little heated!!! The first one I can say I might have messed up the back hole pin...
  3. N

    Washington  Polymer 80 legal Washington state?

    Is a polymer 80 with no serial number legal to conceal carry with a cwp if home built? Asking for a friend..... Future boating accident victim
  4. OldTengu

    Polymer 80 g17 build thread

    I am getting ready to build out my first P80 g17 clone, and am curious as to what advice those more experienced than myself at it might have. I have a complete slide to put together, as well as the frame, all parts are OEM except for the slide itself. Bought necessary tools for the channel...
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