Many of the PVC products we use everyday but tend to take for granted contain phthalate plasticisers. Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. External lubricants can reduce friction between the PVC and the processing equipment, whereas internal lubricants work on the PVC granules. Why does PVC (polyvinyl chloride) have different properties from polyethene? A) PVC B) Polythene C) Bakelite D) None of these 19. Telephone instruments, plastic toys, cooker handles, carry bags, ball point pens, plastic bowls, plastic covering on electrical wires, plastic chairs, electrical switches. Can you write the major difference between these two types of plastics? 5 true 6 false‐Material is melted down and reused, something not possible with thermosetting plastics. The actual PVC polymer content in some flooring applications can be as low as 25% by mass, the remainder accounted for by additives. PVC  was first used as cable insulation as a replacement for rubber during the Second World War and continues to be used widely to this day due to its flexibility, ease of handling in installation and inherent flame retardation. As with most recycling streams, sorting is of the utmost importance to achieve optimal recycling of PVC materials. • Picture: Courtesy of Akcros Chemicals. Stereo specific polymers are obtained by _____ polymerization. Answer: True. FALSE, Thermoplastics. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Can you write the major difference between these two types of plastics? High Phthalates: High molecular weight (HMW) phthalates are those with 7 - 13 carbon atoms in their chemical backbone. 1 Production False. Basil Hamed. Some examples are bakelite, melamine, formica, etc. Decide whether the following statements about thermosetting plastics are true or false. To play this quiz, please finish editing it. Which type of chain would be found in a thermosetting plastic? Question 16. Some examples are polythene, polyvinyl chloride (PVC), polystyrene, teflon, etc. The electrolysis of salt water produces chlorine, which is combined with ethylene (obtained from oil) to form vinyl chloride monomer (VCM). In 2011, the European Council of Vinyl Manufacturers (ECVM) commissioned an independent company to undertake a study on the Total Cost of Ownership (TCO) of PVC products. Cross linked chain. Features & Benefits. Question 4. Lords Cricket Ground roof. They are easily molded and extruded into films, fibers and packaging. Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. PVC and XLPE materials which have been cross-linked to make them thermoset materials also have enhanced resistance to temperature, improved dielectric strengths and resistances to certain chemicals. In addition to use in stadiums and sporting venues, PVC is used extensively by athletes from the clothes and shoes they wear to the equipment they use and the surfaces they compete on. Whether cotton cloth a … Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Can you write the major difference between these two types of plastics? Volksparkstadion roof, Hamburg. Question 14. There are a wide variety of thermoset plastics, some of which rely on their heat resistant properties more than others.    1.2  Bi-Products FALSE, Thermoplastics. The PVC industry is also setting a unique example in the process of working together as a supply chain in driving forward sustainable development. Picture: Fotalia. Examples are bakelite and melamine. Answer 1 Cut the PVC coating in a manner that the die will remove the coating in small pieces. Thermoplasticis a plastic which gets deformed easily on heating and can be bent easily e.g., Polythene and PVC. Stadium seating. 6. false, false, true, true, true. 2. Maximum thermoplastics can be recycled. Which one of these plastics is a thermosetting plastic? Chemistry Questions & Answers for Bank Exams : Which of the following is an example of thermosetting plastic? The liquid crystallinity in polymer may occur by _____ & _____ 4. Ungraded . There are multiple thermoplastic resins that offer various performance benefits, but most materials commonly offer high strength, shrink-resistance and easy bendability. Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. Median response time is 34 minutes and may be longer for new subjects. Thermosetting plastics cannot be softened on heating, therefore they cannot be moulded and reshaped. Differentiate between the thermoplastic an d thermosetting plastics. The European PVC Industry's ten-year Voluntary Committment to Sustainable Development, know as Vinyl2010, made exceptional progress in waste management, recycling and the responsible use of additives. Rubber. Q. Thermosetting Plastics. These include: DINP, DIDP, DPHP, DIUP and DTDP. 1. : Elastomers can be formed in the same way as thermosetting plastics. The plastic used for making optical lenses is _____ 6. For further information, please visit, www.recofloor.org/. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Stereo specific polymers are obtained by _____ polymerization.    6.5 Voluntary Committment to Sustainable Development (VinylPlus) It can't be recycled. Materials that compete with PVC are often promoted as a more natural choice, indeed, ‘natural’ does not equate to ‘better’ or ‘more sustainable'. Urea is an excellent nitrogenous direr which contains nitrogen about: a) 36% b) 47% c) 80 % d) 60% 4. The trade name of polymethylmethacrylate is _____ 8. PVC cables do not harden and crack over time and find use in many applications from telecommunications to electric blankets. More information on the role of PVC in sport can be found at www.pvcinsport.co.uk, PVC is widely used in coated fabrics applications, this includes use in emergency shelters to help people at times of disaster. Rubber. Pencil or bevel cut the PVC coating at the end of the conduit. Define the additive: Anti-static agents. Thermosetting Plastics:There are some plastics which when … Eco-profiles of PVC were updated in 2006 and can be downloaded from the PlasticsEurope Eco-profiles webpages. 3. steel, concrete and sealants) which need to be removed before re-processing. The plastic used for making optical lenses is _____ 6. What is the full form of PVC? (b) Write down the structure of monomer and… B. Thermoplastics and thermosetting plastics. The scheme accepts uplifted vinyl flooring and post-installation off-cuts. Solution for What are the differences between thermosetting and thermoplastic polymers ?    5.5 Sport They are used to make carrier bags. Answer 2 Grind the PVC coating to 5 mil before treading. The first patent for a polymerisation process to manufacture PVC was granted to German inventor Friedrich Klatte in 1913 and PVC has been in commercial production since 1933. Thermoplastics. Give some examples of thermosetting plastics. A thermosetting polymer, resin, or plastic, often called a thermoset, is a polymer that is irreversibly hardened by curing from a soft solid or viscous liquid prepolymer or resin. 2M 75. Early examples of plasticisers include water to soften clay and oils to plasticise pitch for waterproofing ancient boats. The long, individual polymer chains of the plastic become cross-linked by smaller molecules (shown as smaller red lines in Figure 2). Answer 21. 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