The properties and uses of some common thermosoftening plastics are shown in the table … Thermosetting resins are popular because uncured and at room temperature, they're in a liquid state, which allows for convenient impregnation of reinforcing fibers … Richfield, WI 53076, https://dielectricmfg.com/wp-content/uploads/2019/02/header-logo.jpg, Halar® (Ethylene-Chlorotrifluoroethylene), Thermoplastic Materials - Cost Comparison, UHMW (Ultra-High-Molecular-Weight Polyethylene), Vespel® (High-Performance Polyimide-Based Plastic), Nomex® (Synthetic Aromatic Polyamide Polymer). Thermoset and Thermoplastics are two separate forms of polymer powders, which are differentiated based on their behavior when reacting to the application of heat. Another way to prevent getting this page in the future is to use Privacy Pass. Which of the following is a thermosetting plastic: (a) PVC (b) nylon (c) teflon (d) bakelite. It has long chain of molecules with strong intermolecular bonds. When exposed to heat these intermolecular bonds break down and material starts flowing. Nylon is easy to machine and has high abrasion and impact resistance. I am just wondering as to how nylon 6,6 is a thermoplastic. View Solution play_arrow; question_answer39) Which is not a polymer [DPMT 2005] A) Sucrose done clear. • Thermoplastics and thermosetting polymers are types of plastic that undergo different production processes and yield a variety of properties depending on the constituent materials and production method. 13. All of these types can be melted down repeatedly and re-shaped into different forms. Such a material is also known as a thermoset or thermosetting polymer. 2. Which is a thermosetting plastic? Nylon is a thermoplastic polymer. Call 800-367-9122 or email sales@dielectricmfg.com. There are many variations available with additives that enhance properties such as plasticizers to improve impact strength, lubricants to reduce the coefficient of friction and anti … The material similar to silk in appearance is (a) Nylon (b) Rayon (c) Polyester (d) Terylene. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Performance & security by Cloudflare, Please complete the security check to access. Bakelite is a- synthetic polymer— plastic. The main property of this plastic is its insulation towards electricity. Nylon fibres absorb very little water. Which of the following is thermosetting polymer (a) Neoprene (b) PVC (c) Nylon-6,6 (d) Bakelite. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Cloudflare Ray ID: 6075995e5bdfcc7b Collaboration on Alternative Material, Process, Component Material Switch Reduces Downtime, © 2020 Copyright Dielectric Manufacturing. Examples are bakelite and melamine. The members of the family are distinguished from each other by a numbering system indicating the chemical composition of the polymer molecule. The term nylon is used to describe a family of organic polymers called the polyamides that contain the amide (-CONH) group. Nylon should not be used in high-humidity or underwater applications. [A]. View Answer; Q7 In which of the following statement is or are incorrect? Common Uses for Thermoset Plastics. have exceptional thermal stability because of their high melting points. Nylon developed in Netherlands and London. Examples: Nylon, PVC, polystyrene, etc. Nylon was made in the year 1931. All rights reserved. Dieletric Manufacturing. 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. It is used for packaging, bags, bottles, and for some home appliances. Initially, the polymer is a liquid or soft solid. In addition to being heat resistant, thermoset plastics also have a highly flexible design, good dimensional stability, and are much more cost-effective than thermoplastics. Nylons are semi-crystalline and are very tough materials, they also exhibit good heat resistance, chemical resistance and self-lubricating properties. 3.– rubber — is used in conveyor belts. Soln: Answer is (a) Melamine. Answer/Explanation. The use of plastics can be reduced by using bags made of—jute—-or—paper—- instead of polythene … Science MCQs for Class 8 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Thermoplastic is lower in molecular weight, compared to thermosetting plastic. 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. Please enable Cookies and reload the page. [D]. The primary difference between the two is that Thermoset is a material that strengthens when heated, but cannot be remolded or heated after the initial forming, while thermoplastics can be reheated, remolded, and cooled as necessary without causing any chemical chan… Acrylic, Acrylonitrile Butadiene Styrene, Nylon, Polybenzimidazole, Polycarbonate, Polypropylene, Polystyrene, Teflon, Polyvinyl Chloride, etc. Thermosets cannot be recycled for the same purpose, except as filler material. [C]. Thermosetting plastics have high melting points and tensile strength. What Services Do You Offer Besides Fabrication and Machining? Students can solve NCERT Class 8 Science Synthetic Fibres and Plastics MCQs Pdf with Answers to know […] Free PDF Download of CBSE Science Multiple Choice Questions for Class 8 with Answers Chapter 3 Synthetic Fibres and Plastics. Explain why plastic containers are favoured for storing food. Thermosetting plastic is a hard plastic. Heat provides energy for chemical reactions that increase the cross-linking Thermosetting plastics do not—remould— on heating. Nylon is a tough thermoplastic with outstanding wear properties. Nylon is a synthetic polymer, which means they have no basis in organic material like most thermoplastics. 7. Which of the following is obtained from hair of an animal: (a) nylon (b) silk (c) cotton (d) wool. The two most important nylons are nylon 6 and nylon 66 which, between them, account for nearly all of the nylon produced in the United States. Answer (d) bakelite Bakelite is a thermosetting plastic. 4. Your IP: 77.79.239.202 Nylon is thermoplastic. One of the preferred options for disposal of thermoset plastic Sheet moulding compound/ Fibre reinforced plastic (SMC/FRP) wastes is by coprocessing in cement plants due to its high temperature (up … are several examples of thermoplastic materials. Answer: d Explaination: (d) Bakelite is cross linked thermosetting polymer of phenol and formaldehyde. Nylon is easy to machine and has high abrasion and impact resistance. It has excellent tensile and compressive strength and is an excellent electrical insulator. Bakelite is the earliest commercially successful thermoset plastic. Types of thermoplastics usually employed for manufacturing include polyethylene, polyvinyl chloride, and polystyrene, which often is used for packaging. Nylon is a tough thermoplastic with outstanding wear properties. [B]. Question 18. Things like, keyboards, tools, doors, kitchen utensils, are made out of thermosetting plastic. Explain the difference between thermoplastic and thermosetting plastics. Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a catalyst.Heat is not necessarily to be applied externally. Fishing nets are made from—nylon—. Thermoset plastics are often used for sealed products due to their resistance to deformation. There are many variations available with additives that enhance properties such as plasticizers to improve impact strength, lubricants to reduce the coefficient of friction and anti-oxidizers to improve operating temperature range. And thermoset stand for how a material is also known as a thermoset thermosetting. Polymer, which means they have no basis in organic material like most.... In appearance is ( a ) Melamine ( b ) Rayon ( c Polyester! To high temperatures polyesters, polyimides, and nylons thermal stability because of their high melting points and strength! 2.0 now from the Chrome web Store it is used for sealed products due their! 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