With around 1500 hospitals in the UK, estimates put the total tonnage of PVC waste at over 2,000 tonnes per annum. The essential raw materials for PVC are derived from salt and oil. The latest BRE 'Green Guide to Specification', confirms that PVC is one of the best all-round framing materials currently on the market. 1 Answer to Which of the following would you expect to be elastomers and which thermosetting polymers at room temperature? Picture: Fotalia. These are the types of polymers that melt on heating and solidify on cooling. Thermosetting Plastics:There are some plastics which when moulded once cannot be … They are easily molded and extruded into films, fibers and packaging. Page No 44: Question 12: Give scientific reasons for the following: (a) Plastic containers used for microwave cooking can be made of thermosetting plastic. The environmental impacts of any one material cannot be judged in isolation since the use of alternatives will not be without cost, either financially or to the environment. For further information, please visit, www.recofloor.org/. PVC (polyvinylchloride) -a cheaper plastic used for window frames and pipes. Other construction applications: door profiles, pipes and fittings, power, data and telecoms wiring and cables, cable and services ducting, internal and external cladding, conservatories and atria, roofing and ceiling systems and membranes, rainwater, flooring and wallcoverings.    5.4 Automotive Thermoplastics can soften upon heating and return to their original form on cooling. Can you write the major difference between these two types of plastics? Before PVC can be made into products, it has to be combined with a range of special additives. Question 16. Examples of thermoset types include rubber insulations such as silicone rubbers and EVA (Ethylene-Vinyl Acetate).. PE and PVC may also be cross-linked making them thermosetting types. polycarbonate - used to make strong, transparent panels and vehicle lights. PVC has been used for hundreds of life-saving and healthcare products for almost 50 years being used in surgery, pharmaceuticals, drug delivery and medical packaging due to its unrivalled performance characteristics and cost-efficiency. A thermosetting plastic is a polymer that irreversibly becomes rigid when heated. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride … Join now. False. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. Optional additives, include a range of substances from processing aids, impact modifiers, thermal modifiers, UV stabilisers, flame retardants, mineral fillers, pigments, to biocides, and blowing agents for specific applications. For more information, please visit www.vinylplus.eu. Answer 21. Speciality plasticisers, such as adipates, citrates, benzoates and trimeliltates are used where special physical properties are required such as the ability to withstand very low temperatures or where increased flexibility is important. The use of these phthalates in Europe is limited to certain specialised applications. Question 13. Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. 4. Common Uses for Thermoset Plastics. What … Pencil or bevel cut the PVC coating at the end of the conduit. Optional additives include processing aids, impact modifiers, fillers, nitrile rubbers, pigments and colorants and Flame Retardants. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc.    5.2 Healthcare polycarbonate - used to make strong, transparent panels and vehicle lights. Question 2. There are many definitions of Sustainability and Sustainable Development, but it can best be defined by the three main pillars of sustainability; social, economic and environmental. The plastic used for making optical lenses is _____ 6. _____ is an example of fibre reinforced plastic. Why does PVC (polyvinyl chloride) have different properties from polyethene? Answer: 4R’s stands for Redue, Reuse, Recycle and Recover. Telephone instruments, plastic toys, cooker handles, carry bags, ball point pens, plastic bowls, plastic covering on electrical wires, plastic chairs, electrical switches. Answer: 4R’s stands for Redue, Reuse, Recycle and Recover. The material now accounts for about 20% of all plastic manufactured world-wide, second only to polyethlene. 7 Useful Links Urea is an excellent nitrogenous direr which contains nitrogen about: a) 36% b) 47% c) 80 % d) 60% 4. The most commonly used plasticisers are phthalates which can be divided into two distinct groups with very different applications and classifications; PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. performance sports surfaces, sports equipment, clothing, protective barriers, matting, wiring and piping infrastructure. True or False: Thermosetting plastics can be reheated and formed into new materials. The long, individual polymer chains of the plastic become cross-linked by smaller molecules (shown as smaller red lines in Figure 2). LSR TPE. Stereo specific polymers are obtained by _____ polymerization. Define the additive: Anti-static agents. Pvc is a thermosetting plastic say true or false Get the answers you need, now! A polymerisation in which two or more different monomers takes part is called _____ 7. Report an issue . In 1-2 sentences, please explain one of the approaches to solving the water solubility problem of packaging liquids in paper from the article "Paper is Pressing Forward." Explain why the following are made of thermosetting plastics: (a) Saucepan handles (b) Electric plugs/switches/plug boards 6. Molecules of VCM are polymerised to form PVC resin, to which appropriate additives are incorporated to make a customised PVC compound . Polymers … 2) Thermoplastics can be bent easily. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. State True or False: Polymers the small units used in making synthetic fibers. Give 2 elastomers. PVC packaging is also widely used in the packaging of pharmaceutical products. SURVEY . Question 4. 3) Examples are polythene and polyvinyl chloride. Thermoplastics become moldable above a specific temperature and then return back to a solid when cooled. 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