ABS (Acrylonitric Butadiene Styrene) 8. It is non-toxic and so can be produced to fit FDA grades and be used as containers for consumable goods. This material originated in England was produced commercially in the United States in 1943. Copyright 10. However, polyester is also used in electrical, medical, automotive and packaging applications. Polyethylene or Polythene 2. This website uses cookies to improve your experience. Thermoplastics react to heat. while the lower density alternative tends to be used more for. Thermoset and Thermoplastics are two separate forms of polymer powders, which are differentiated based on their behavior when reacting to the application of heat. (iv) They are brittle at low temperature, translucent and flammable. (ix) PVC has a tendency to decompose when it is heated or exposed to sunlight with the liberation of hydrochloric acid gas. having the property of softening or fusing when heated and of hardening and becoming rigid again when cooled. (vii) It has excellent resistance to most chemicals and solvents. (vi) They have very high softening temperatures and thus moulding becomes difficult. (iv) They are unaffected by water, inorganic salts, alkalies and many acids. The processes required for recycling vary with the thermoplastic. One way to explain the difference between thermoplastic and thermosetting polymers, is to consider an omelet. How does it work? It has a variable crystalline structure that allows for a vast range of applications. It can be moulded in a wide variety of colours too. As a moulding compound they have good qualities and the ability to withstand high heat (upto 260°C). It is the oldest known plastic and was employed about 3000 B.C. Prohibited Content 3. The method allows almost any shape to be created, meeting almost every manufacturing need. This review is restricted to unreinforced and short fibre reinforced thermoplastics where the reinforcing fibre (usually glass or carbon) is typically less than 2-3 mm in length. The workhorses of the Engineering Thermoplastics are the polyamides (PA 6, PA66), polyesters (PET, PBT), polycarbonate (PC), polyacetals (POM) and acrylonitrile-butadiene-styrene (ABS). They exhibit good temperature capability as they possess high glass transition temperature, Tg. Acrylics 7. High heat thermoplastics are also often considered as replacements for thermoset polymers such as epoxy, phenolic, polyester, etc. (ii) It is attacked by acetone, petrol etc., but it is resistant to household chemicals. Generally, amorphous thermoplastics are less chemically resistant and can be subject to stress cracking. It can be fabricated into desired shapes by hot processing and sintering the polymer powder. When cooled, thermoplastics return to solid. In order for the method to be flexible, as well as highly reliable, a range of thermoplastics is necessary. Another common thermoplastic, polypropylene (PP) is very flexible, rendering it perfect for such applications as athletic clothing, rugs and car parts that need to be bent into position. (iii) It is attacked by aromatics and soluble in ketones and esters. It is available in two forms namely flexible and rigid. (vi) Freedom from taste and colour and physiologically harmless nature makes polystyrene suitable for use in contact with foodstuffs. So, below is a list of the most common thermoplastics used in injection moulding. The mer of PTFE is represented as CF2 = CF2. The general name of linear polyamides is nylon. Polyethylenes are obtainable as various liquids, gums and tough flexible solids suitable for moulding. If your interest in plastic extends beyond your application at hand and you start to dig the chemical makeup and processes to make plastic you may come across the terms “amorphous” and “semi-crystalline” thermoplastics. But opting out of some of these cookies may have an effect on your browsing experience. (vi) Dielectric losses and dielectric constant are low. These cookies do not store any personal information. The two reactants are mixed in a reaction at a high temperature and moderate pressure, using copper as a catalyst. We'll assume you're ok with this, but you can opt-out if you wish. The main physical difference is how they respond to high temperatures. Underground polythene is not affected by salts in the soil and has excellent resistance to salts and bacteria. A polymer material that becomes pliable with heat, and with sufficient temperature, a liquid. (i) High voltage (upto 30 kV) applications. thermoplastic. Typical properties of HDPE are given in Table 9.1. The plastics used for pop bottles are a common example of thermoplastics that can be and are widely recycled. In PVC one in four hydrogen atoms is replaced by a chlorine atom, hence it has greater rigidity. They are resistant to acids and alkalies. Acrylonitrile Butadiene Styrene. It is one of the most easily recyclable plastics and is used to produce bottles, bags and synthetic fibers for clothing. They are easily worked, molded, and thermoformed for many applications, such as electronic components, construction materials, data storage devices, automotive and aircraft parts, check sockets in prosthetics, and security glazing. Bitumen. The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. The condensation reaction takes place between the acid group at one side and amino group at other side of the same molecule. 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