Plastic roads could be quick and simple to construct, so why don't we use them? Plastic Roads Sound Like a Crazy Idea, Maybe Aren't by Evan Ackerman, IEEE Spectrum, 1. More complex shapes can be produced.Ī length of tube is produced by extrusion. hollow pipe or thin sheet of polyethylene that has a consistent. slippery that it takes several sandblasting and baking processes and a. Photo: A typical nonstick Teflon cooking pan.
World War II shortages, sudden demand led to so- called. But when stockings reappeared in very limited quantities. secret science of condensation polymers, which powers these leggy wonders, was figured out by Wallace Carothers in the 1. This tough, heat- resistant thermosetting plastic was. Photo: Bakelite was widely used to make telephones during the first half of the 2. You can read more about environmentally friendly plastics. It breaks down harmlessly in soil, but is much. such as PET are now recycled into a range of useful goods, such as.
The bodies of fully a quarter of the world's seabirds. GT, which has been long in development but is still not commercially marketed. developments, light- emitting polymers (LEPs), could replace. Photo: The plastic keys on this computer keyboard are made by injecting plastic into specially shaped molds. Their new plastic process could reduce the number of body. Chrysler are now looking to produce car bodies. composites have long been used to manufacture car components, but. chemists continue to pioneer improved methods of polymerization and. polytetrafluoroethylene (PTFE) or Teflon is a slippery heat- and. Plastics in action: NASA's plastic Pathfinder aircraft in flight. And calendering involves squeezing sheets of plastic. molding involves heating resin pellets until they melt, then forcing. involves squeezing plastic like toothpaste through a mold and is used. Some of these provide color or texture, while. Plastic goods such as hosepipes or washing- up bowls begin life as a raw. Epoxy resins and bakelite are examples of thermosetting. Examples include polyethylene and polystyrene. Polyethylene (polythene) is made by repeating the ethene monomer over and over again. building polymers by adding together monomers is called additive.Īnother process called condensation polymerization (or. Most plastics are polymers, long molecules made up of many repetitions. Photo: Cheap but effective, the OLPC laptop. are the most versatile materials ever invented. Plastics: A simple introduction - Explain that Stuffby Chris Woodford. What are they and what do we use them for? Author: AQA Subject: GCSE Design and Technology: Product Design Keywords.Īn easy-to-understand introduction to the science and technology of plastics. Current File (2) 8 2 John Wiley & Sons Information Technology & Software Development Adobe Creative Team. University of the Arts London's website map.
0 kommentar(er)
