Explain why the following are made of thermosetting plastics: (a) Saucepan handles (b) Electric plugs/switches/plug boards 6. A thermoplastic, or thermosoftening plastic, is a plastic polymer material that becomes pliable or moldable at a certain elevated temperature and solidifies upon cooling.. 4. 2. It is a phenolic in the literal sense, not in the loose sense the word is sometimes used to describe thermosets generally. Thermosetting plastics do not—remould— on heating. 7. Another way to prevent getting this page in the future is to use Privacy Pass. Nylon developed in Netherlands and London. Bakelite is the earliest commercially successful thermoset plastic. [D]. 3.– rubber — is used in conveyor belts. It has excellent tensile and compressive strength and is an excellent electrical insulator. Kevlar which has a higher degree of crystallinity is a thermoset. Thermoplastic (nylon) is more flexible than thermoset and has a shinier, glossy finish. Cloudflare Ray ID: 6075995e5bdfcc7b MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Nylon is a synthetic polymer, which means they have no basis in organic material like most thermoplastics. Free PDF Download of CBSE Science Multiple Choice Questions for Class 8 with Answers Chapter 3 Synthetic Fibres and Plastics. Nylon is easy to machine and has high abrasion and impact resistance. Price comparison chart for various thermoplastic materials, also noting basic material properties. Nylon is thermoplastic. It is used for packaging, bags, bottles, and for some home appliances. On the opposite of that Thermosetting doesn't regain its shape after heating. Dieletric Manufacturing. The main property of this plastic is its insulation towards electricity. Among these thermoplastics, some materials such as Polybenzimidazole, Teflon, etc. Examples are bakelite and melamine. Is Dielectric Manufacturing ISO Certified? Thermoplastics comparisons. 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. The most common thermosetting resin used today is a polyester resin, followed by vinyl ester, and epoxy. Bakelite is a- synthetic polymer— plastic. Acrylic, Acrylonitrile Butadiene Styrene, Nylon, Polybenzimidazole, Polycarbonate, Polypropylene, Polystyrene, Teflon, Polyvinyl Chloride, etc. Other groups of thermoplastics are fluoropolymers, acrylics, polyesters, polyimides, and nylons. are several examples of thermoplastic materials. Explain why plastic containers are favoured for storing food. 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. [D]. Nylon was made in the year 1931. Please enable Cookies and reload the page. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Nylon is a thermosetting polymer. Nylon-66 is a [RPET 1999; MP PMT 1993] A) Natural polymer done clear. Thermoplastics have low melting points and low tensile strength. Thermosetting plastic is processed by Compression molding. • Thermosetting resins are popular because uncured and at room temperature, they're in a liquid state, which allows for convenient impregnation of reinforcing fibers … Your IP: 77.79.239.202 Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Thermoset plastics are often used for sealed products due to their resistance to deformation. Contact a Dielectric Manufacturing knowledge expert to discuss the use of nylon for fabrication of your plastic parts. B) Condensation polymer ... Thermosetting plastic done clear. View Answer; Q7 In which of the following statement is or are incorrect? 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. Performance & security by Cloudflare, Please complete the security check to access. 14. 13. Types of thermoplastics usually employed for manufacturing include polyethylene, polyvinyl chloride, and polystyrene, which often is used for packaging. Thermosetting plastics are normally made up of lines of polymers which are highly cross-linked. Fishing nets are made from—nylon—. 5. 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. Thermosets cannot be recycled for the same purpose, except as filler material. Nylon is a thermoplastic polymer. Answer (d) wool When exposed to heat these intermolecular bonds break down and material starts flowing. Thermosetting plastics have high melting points and tensile strength. A thermosetting plastic is a polymer that irreversibly becomes rigid when heated. 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. Nylon is not attacked by moths and ordinary chemicals. The heavily cross-linked structure produced by chemical bonds in thermoset materials is directly responsible for the high mechanical and physical strength compared with thermoplastics or elastomers. Thermosetting plastic is a hard plastic. 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). In thermosetting plastic, the polymer chains form strong cross … Question 18. 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 … 5. [C]. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Call 800-367-9122 or email sales@dielectricmfg.com. All of these types can be melted down repeatedly and re-shaped into different forms. 4. Nylon is a tough thermoplastic with outstanding wear properties. Features & Benefits. Thermoplastic is lower in molecular weight, compared to thermosetting plastic. Nylon is easy to machine and has high abrasion and impact resistance. Explain the difference between thermoplastic and thermosetting plastics. Such a material is also known as a thermoset or thermosetting polymer. W206N12865 Gateway Court • The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. 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. It is flexible, soft and stiff. Thermosetting plastics have primary bonds between molecular chains and held together by strong cross-links. Thermoplastics are the polymers which loses their shape on heating and regain their shape on cooling. It is processed by Injection molding. Explanation: Thermosetting plastics when moulded once can not be softened by heating. Give examples which indicate that nylon fibres are very strong. View Solution play_arrow; question_answer39) Which is not a polymer [DPMT 2005] A) Sucrose done clear. Nylon fibres absorb very little water. But Here thermosetting plastic, plasticity does not increase with temperature. Which of the following is a thermosetting plastic: (a) PVC (b) nylon (c) teflon (d) bakelite. All rights reserved. Science MCQs for Class 8 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Plaskon is another example of thermosetting Plastics. The main physical difference is how they respond to high temperatures. You may need to download version 2.0 now from the Chrome Web Store. Answer (d) bakelite Bakelite is a thermosetting plastic. [A]. Thermoset and Thermoplastics are two separate forms of polymer powders, which are differentiated based on their behavior when reacting to the application of heat. I am just wondering as to how nylon 6,6 is a thermoplastic. Which is a thermosetting plastic? Some other examples are PVC, Nylon. B) Enzyme done clear. Why is Nylon 6,6 a thermoplastic yet Kevlar a thermoset? What Services Do You Offer Besides Fabrication and Machining? There are a wide variety of thermoset plastics, some of which rely on their heat resistant properties more than others. have exceptional thermal stability because of their high melting points. Nylon is a tough thermoplastic with outstanding wear properties. 3. Examples: Nylon, PVC, polystyrene, etc. Nylons are semi-crystalline and are very tough materials, they also exhibit good heat resistance, chemical resistance and self-lubricating properties. It has long chain of molecules with strong intermolecular bonds. Collaboration on Alternative Material, Process, Component Material Switch Reduces Downtime, © 2020 Copyright Dielectric Manufacturing. The properties and uses of some common thermosoftening plastics are shown in the table … 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. Thermosetting Plastics. It has excellent tensile and compressive strength and is an excellent electrical insulator. Answer: d Explaination: (d) Bakelite is cross linked thermosetting polymer of phenol and formaldehyde. The members of the family are distinguished from each other by a numbering system indicating the chemical composition of the polymer molecule. The material similar to silk in appearance is (a) Nylon (b) Rayon (c) Polyester (d) Terylene. 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. Which of the following is thermosetting polymer (a) Neoprene (b) PVC (c) Nylon-6,6 (d) Bakelite. 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 … 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… Heat provides energy for chemical reactions that increase the cross-linking (a) Melamine (b) Polythene (c) PVC (d) Nylon. Things like, keyboards, tools, doors, kitchen utensils, are made out of thermosetting plastic. The term nylon is used to describe a family of organic polymers called the polyamides that contain the amide (-CONH) group. Common Uses for Thermoset Plastics. Which of the following is obtained from hair of an animal: (a) nylon (b) silk (c) cotton (d) wool. Molded thermoplastic for maximum resistance to impact, abrasion, fading and discoloration; Resistant to mechanical stress associated with high abuse applications [B]. Initially, the polymer is a liquid or soft solid. Answer/Explanation. Students can solve NCERT Class 8 Science Synthetic Fibres and Plastics MCQs Pdf with Answers to know […] The use of plastics can be reduced by using bags made of—jute—-or—paper—- instead of polythene … Nylon should not be used in high-humidity or underwater applications. There are multiple thermoplastic resins that offer various performance benefits, but most materials commonly offer high strength, shrink-resistance and easy bendability. It has hydrogen bond crosslinks and is semi crystalline. Soln: Answer is (a) Melamine. Materials, they also exhibit good heat resistance, chemical resistance and self-lubricating properties flexible thermoset... Alternative material, Process, Component material Switch Reduces Downtime, © 2020 Copyright Dielectric.... 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