background preloader

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. 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] As of June 2010, NatureWorks was the primary producer of PLA (bioplastic) in the United States. Chemical and physical properties[edit] Related:  how to make printing material

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. PLA can be sorted and recycled, but it takes some energy intensive processes to do it. Also, PLA looks a whole lot like other plastics such as PET. Many manufacturers and organizations call for PLA products to be very clearly marked when used, so that they can be more easily sorted. All-in-all, PLA can be a more eco-friendly option in some ways, but isn't an ideal solution to petroleum-based plastics.

Make Cornstarch Plastic | Sail On! Experiment 2 Materials: 7 tablespoons of water 1 tablespoon of starch 2.5 teaspoon of vinegar 1.5 teaspoon of glycerin .5 teaspoon of baking soda Procedure l First, add one-half teaspoon of baking soda, then two tablespoons of water into a separate, small container, then set it aside for later. l Add seven tablespoons of cold water into a pan, then about one tablespoon of starch. Turn the burner to low heat, and then stir the mixture. Add the baking soda and water mixture, then let everything in the pan boil for 10 minutes. Get a sheet of aluminum foil so that you can carefully pour the gooey substance onto it for drying. Let the potato substance dry for one day in a sunny room, or place it into the oven for faster results. Mold or shape your newly created plastic. (from Like this: Like Loading...

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 2. Now to the meat, what everyone wants to know. The original recipe we used was but using cornstarch instead of potato starch. Our recipe then became: 7 parts water 1 part vinegar 1/2 part glycerine 1 1/2 parts starch With respect to the microwave, the mix was accidental (very unscientific I know), Chris was trying to replicate it on Sunday but without joy. From what I can remember the original microwave success came from the following approximate recipe: 1 part water 1 part starch splash glycerine bigger splash vinegar Microwave for too long until you have a gel rather than a liquid. Like I said, not very scientific.

materials Bioplastic - the plastic wrap that's good enough to eat | Video | Reuters.com 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. And this is where most of that plastic ends up. Sept. 25 - Argentine researchers have developed an edible, biodegradable alternative to conventional plastic for use in bags and as food wrappings. Welcome to Reprap-Walmart! - 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. We will not take further orders until the Kickstarter rewards have shipped. Are you frustrated with the high cost of filament for your 3D printer? The Filastruder meets these needs and more, because it is a filament-making machine. Others have tried to produce filament extruders, but have run into difficulties. and run for hundreds of hours, producing dozens of spools of quality filament. The design has been iterated and refined based on beta testers' feedback, and is now ready for prime time. In November, I built the alpha version of what would become the Filastruder.

polymers | Archive  Luisa Pereira and Manuela Donoso collaborated on this musical instrument made of elastics and light. On the first version they used regular elastics coated with conductive ink and on the final version opted for stretch ... In this video Becky Stern from Adafruit shows how to make a simple circuit on a transparent sheet of plastic coated with indium tin ... Heart On Your Sleeve from Scott Garner on Vimeo. Endlighten is an acrylic sheet infused with colorless light diffusing particles. While regular acrylic only diffuses light around the edges, ... light diffusing acrylic Materials 101, Polymers Shape memory polymer strips (image by Inventables) Heat Reactive Materials Heat reactive materials change state, shape and/or color when exposed to temperatures above ambient. heat reactive polymers Empa's EAP propelled airship with Dielectric Elastomer (DE) actuators as ... EAP propelled airship Polymers a few videos about polymorph.. Polymers, Techniques featured video :: EAP-Blimp

Making Bioplastic (PLA) | World Centric From Earth to Pellet: Comparing Resource Requirements between PLA, PP, PET and EPS Products Download the .pdf here. Benchmark: How does PLA compare against its PP, PET and Styrofoam counterparts? How much resources go into making one pound of each of these materials? Table 1: From Earth to Resin (Comparison) – Resources (inputs) required to produce one pound of materials.1 Table 2: From Earth to Resin (Comparison) – PLA values are set at 100% for benchmarking. Graphical Representation: Conclusions: PLA requires the least amount of energy to produce. Annual Consumption: What are the consequences of choosing each of these products after one year? Assumption: Let's assume that the average person uses 5 disposable items per day for one year and that the average household uses 29.19 kWh of energy per day.2 Comparisons: What difference would it make to choose PLA? Choosing PLA corn-starch products over PP and PET plastics will: Choosing PLA corn-starch products over Styrofoam will: References

CNBP_024548 Uso de la yuca (Manihot esculenta Crantz) y otras fuentes de almidones no convencionales en la alimentación de rumiantes | Knowles | Revista Colombiana de Ciencias Pecuarias Use of cassava (Manihot esculenta Crantz) and other starchy non-conventional sources in ruminant feeding¤ Uso de la yuca (Manihot esculenta Crantz) y otras fuentes de almidones no convencionales en la alimentación de rumiantes Utilização da mandioca (Manihot esculenta Crantz) e outras fontes de amido não convencionais na alimentação de ruminantes María M Knowles1*, Zoot, MSc; Martha L Pabón1,2, Quim, PhD; Juan E Carulla1, Zoot, PhD. * Autor para correspondencia: María M Knowles. 1 Grupo de Investigación en Nutrición Animal, Facultad de Medicina Veterinaria y de Zootecnia. 2 Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia. (Recibido: 23 marzo, 2011; aceptado: 1 junio 2012) Summary This review analyses available information on alternative starchy feeds different from corn available in the tropics, and its use in ruminants. Key words: cassava, milk production, potato, starches in ruminants. Resumen Resumo Introducción Características fisicoquímicas Proteína cruda Fibra

temperaturas bioplastic Experiment Experiment home Objective The objective of the “Bioplastics Experiment” is to show the students the advantages and disadvantages of running a fractional factorial. The students run a 2^k-1 fractional factorial to determine which levels of bioplastic ingredients / cooking method produce the best quality bioplastic. The students break up into four groups. Each group selects a different bioplastic; Milk plastic, Stovetop corn plastic, Microwave corn plastic and Flubber. Equipment - per group Making bioplastics requires various kitchen supplies and some perishable items. 1 cookie sheet (set of 3 for $16.99 , Target) 1 mixing spoon ($1.99, Target) 1 set of measuring cups (set of measuring cups and spoons $9.99, Target) 1 set of measuring spoons (see above) 1 roll of aluminum foil ($3.59, Kroger) Procedure Assign the following tasks to different team members within your team; 1) Measurer (Measures out the ingredients and pours them in the containers.), 2) Mixer/cooker (Mixes the ingredients.

Related: