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polymer
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.
This is a B&T brand mp5-style stock for the stribog. It comes with the adapter for the stribog but can be switched out to any other adapter for your weapon of choice.
I am asking 150, 155 shipped, or trade for magpul mbus pro front and rear backup iron sights. I am not interested in any other...
3 (30) round Zastava Polymer last round bolt hold open mags
These are excellent mags 2 are lightly used (under 50 rounds each)
1 is brand new.
$60 for all three
Would also trade for 7.62x39 or 223/556 ammo.
3 (30) round Zastava Polymer last round bolt hold open mags
These are excellent mags 2 are lightly used (under 50 rounds each)
1 is brand new.
$25 per mag or $70 cash for all 3
Would also trade for 7.62x39 or 223/556 ammo.
a bit of a safe queen.
loaded the magazines a few times cleaned the gun a couple times but never fired.
all the stuff in the pic's goes with and had Walther sent me the RMR version MOS plate so Trijicon/Holosun compatible as well.
We are up north a bit but happy to meet up at your Portlandish...
Selling a HK VP9 Optics Ready grey frame bundled with extras.
This newer production model also comes with three 17-round magazines, suppressor height XS iron sights, an OEM threaded barrel with Micro Compensator from Griffin Armament. Also included shall be a T-Rex Arms Sidecar 2.0 holster...
I bought this to build a complete polymer 80 9MM.
Unfortuonately, the lower I bought was for G17 upper and this upper is Glock 19 or compact upper.
Polymer 80 Part number is in one of the pictures, please confirm it’s the right one for your application.
It is new, never fired.
Swamp fox red dot...
I may have purchased too many magazines before the WA ban was put into place. As such, I have six CZ Scorpion 30 Round Black Polymer Magazines for sale. I'm only selling as a lot and for obvious reasons, I have to sell out of the state.
Still in plastic packaging. This product has recently been rebranded as Throom and I don't think they offer any other color except green now.
Cash $80
Trades:
- 7.62x39
- Steel cased 308
- Threaded 10/22 barrels
I'm leaving the country soon and found more gear while emptying my house out, up for sale is a dozen brand new AR magazines. 7 tapco magazines and 5 MFT magazines. These are brand new never used. Buyer picks up at the Fred Meyers in the town of Cornelius, cash only.
$12 a magazine or $120 for...
If anyone has….. someone I’m sure. How difficult is it to match magpul or polymer furniture to older break action shotties?
I picked up an ole Steven’s nitro special 12g as a trunk something….. not interested in restoration or OG parts…. Investing enough time I could replace wood but the...
Gday Folks
Cleaning out my house in preparation to head overseas next year so more parts, gear ect will become available over the next few months.
Buyer picks up at the Fred Meyers in Cornelius Oregon, not the one at Cornelius pass road. No trades, cash only. Also check out my other ads I have...
Any of you guys like weird rifles? I was going to build myself a weird rifle. An ultra-lightweight AR with this KE ARMS BLACK KP-15 POLYMER STRIPPED RECEIVER polymer lower. Change my mind after I decided to go with a heavy .223 Wylde barrel, and then this polymer lower just didn't make any...
Like-new condition. The Steyr M9-A2 is a massively underrated gun! Super low bore axis and cool triangular sights. Selling due to medical bills, not because I don’t absolutely love the gun.
I'm including the pistol and the original box.
Must be willing to meet me at A Cut Above Pawn in Aloha/...
Mossberg 500 12 gauge factory action tubes for sale. 7 3/4 length for all 3, action tube nut included. 60 each for 2 on right of picture, One on the left has been traded. All sold
Also have 2 polymer forend pieces, 10 each.
Perfect to upgrade to the 2 arm forend or upgrade your Maverick 88 to be...