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Polylactic acid

Poly(lactic acid) or polylactide (PLA) is a thermoplastic aliphatic polyester derived from renewable resources, such as corn starch (in the United States), tapioca roots, chips or starch (mostly in Asia), or sugarcane (in the rest of the world). In 2010, PLA had the second highest consumption volume of any bioplastic of the world.[3] The name "poly(lactic acid)" does not comply with IUPAC standard nomenclature, and is potentially ambiguous or confusing, because PLA is not a polyacid (polyelectrolyte), but rather a polyester.[4] Production[edit] There are several industrial routes to usable (i.e. high molecular weight) PLA. Two main monomers are used: lactic acid, and the cyclic di-ester, lactide. Another route to PLA is the direct condensation of lactic acid monomers. Polymerization of a racemic mixture of L- and D-lactides usually leads to the synthesis of poly-DL-lactide (PDLLA), which is amorphous. Manufacturers[edit] Chemical and physical properties[edit] Applications[edit]

http://en.wikipedia.org/wiki/Polylactic_acid

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How Corn Plastics Are Made, And Why We Still Aren't Thrilled Our Discovery Channel sister site How Stuff Works has put out an interesting video on how corn plastics work. The video is informative about how corn plastics, or PLA, is produced. But it got us thinking about other issues with PLA that weren't really addressed.Corn plastics are controversial for a few reasons, not the least of which are that they use a resource that is energy intensive to produce, and because they can really gum up the works of recycling centers when not sorted properly. ABS,PLA melting process in extruder and nozzle(private observed idea),that why some PLA will block extruder Filament melting process in nozzle Normal ABS: ABS is soft, there are two statue, soft and melting, Normal PLA:

Ring-opening polymerization IUPAC definition for ring-opening polymerization A polymerization in which a cyclic monomer yields a monomeric unit which is acyclic or contains fewer cycles than the monomer. Note: If the monomer is polycyclic, the opening of a single ring is sufficient to classify the reaction as ring-opening polymerization. Modified from the earlier definition[1] .[2] Make Cornstarch Plastic Experiment 2 Materials: 7 tablespoons of water 1 tablespoon of starch 2.5 teaspoon of vinegar

PLA 4043D - Granulate - 500gr - natural - Plastic granulate - Plastic filament - Catalog Welcome to the ORCABOT website Since 2009 ORCABOT is selling 3D printers all over the world. One of our printers is the Orca, which is well known on the market. Our main goal is to sell high quality, but affordable 3D printers. Every day, our development team is working on improvements and new technology. We also sell filaments, parts and give instructive workshops. Dialysis (biochemistry) In biochemistry, dialysis is the process of separating molecules in solution by the difference in their rates of diffusion through a semipermeable membrane, such as dialysis tubing.[1] Dialysis is a common laboratory technique that operates on the same principle as medical dialysis. In the context of life science research, the most common application of dialysis is for the removal of unwanted small molecules such as salts, reducing agents, or dyes from larger macromolecules such as proteins, DNA, or polysaccharides.[2] Dialysis is also commonly used for buffer exchange and drug binding studies.

Bioplastics – the quest for Open Source material production « Mindflip Chris, Mendel and myself have been involved in a bit of bioplastics experimentation over the past few days, which appears to be generating some interest. We’re doing the research/experimentation for a couple of reasons 1. It’s fun Why are filament spools so expensive compared to pellets? ElectricMucus Wrote: ------------------------------------------------------- > What bugs me is as said before that the process > isn't that different, both come from cylindrical > extrusion. > How I understand it a machine used to make pellets > could also make filament (heck it even does, you > just have to roll it up). > The cooling process could be a little different or > will likely to be more complicated but I don't see > how that would affect prices to that extent. > The power needed to make pellets or filaments is > likely to be exactly the same. Since you seem to be completely unaware, most of the cost in extruding filament comes from the labor in spooling the filament and watching over the machine. Large spools are quite a bit cheaper than small spools since they don't need to be changed nearly as often.

Adhesion Adhesion of a frog on a wet vertical glass surface. Process of attachment of a substance to the surface of another substance. Note 1: Adhesion requires energy that can come from chemical and/or physical linkages, the latter being reversible when enough energy is applied. Note 2: In biology, adhesion reflects the behavior of cells shortly after contact to the surface. Bioplastic - the plastic wrap that's good enough to eat video transcript PLEASE NOTE: THIS EDIT CONTAINS CONVERTED 4:3 MATERIAL According to the U.S. Environmental Protection Agency hundreds of millions of tons-worth of plastic bags are discarded every year. Corn Plastic to the Rescue Thirty minutes north of Omaha, outside Blair, Nebraska, the aroma of steaming corn—damp and sweet—falls upon my car like a heavy curtain. The farmland rolls on, and the source of the smell remains a mystery until an enormous, steam-belching, gleaming-white architecture of tanks and pipes rises suddenly from the cornfields between Route 75 and the flood plain of the Missouri River. Behold NatureWorks: the largest lactic-acid plant in the world. Into one end of the complex goes corn; out the other come white pellets, an industrial resin poised to become—if you can believe all the hype—the future of plastic in a post-petroleum world. The resin, known as polylactic acid (PLA), will be formed into containers and packaging for food and consumer goods.

Adsorption Brunauer, Emmett and Teller's model of multilayer adsorption is a random distribution of molecules on the material surface. Increase in the concentration of a substance at the interface of a condensed and a liquid or gaseous layer owing to the operation of surface forces. Note 1: Adsorption of proteins is of great importance when a material is in contact with blood or body fluids. In the case of blood, albumin, which is largely predominant, is generally adsorbed first, and then rearrangements occur in favor of other minor proteins according to surface affinity against mass law selection (Vroman effect). Note 2: Adsorbed molecules are those that are resistant to washing with the same solvent medium in the case of adsorption from solutions. The washing conditions can thus modify the measurement results, particularly when the interaction energy is low. [3]

Filastruder: A robust, inexpensive filament extruder. by Tim Elmore We've successfully shipped our Kickstarter kits, and we're ready to take orders through our website - ****************************WAITLIST OPEN:Many of you have asked for more kits. We are pretty much at capacity, with orders into September, but have opened a waitlist to notify you as soon as we're ready to ship again. Send an email to filastruder@gmail.com to reserve your spot.

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