Bakelite B. Melamine C. Branched D. Cross-linked 10. Bakelite stock is still manufactured and produced in sheet, rod and tube form for industrial applications in the electronics, power generation and aerospace industries, and under a variety of commercial brand names. In the 1950s my dad's friends used to tell me about the early military uses of bakelite and melamine plastics, mostly as lightweight waterproof containers … This type of plastic is used for making auto parts, aircraft parts etc. Why are the chemicals in the laboratory stored in plastic containers ? It chokes drains and blocks the pores of the soil, which hinders the absorption of water by the soil. After the 1950s, a large variety of plastics appeared in the marketplace and edged out Bakelite in all but a few specialized (mostly electrical) uses. NCERT Solutions for Class 8 Science Chapter 3 MCQs. These materials are prized for high modulus, high glass transition temperature, high char yield, and versatility. It is also used to make jewelry articles and toys. They do not lose their dimension changing ability. USES OF BAKELITE: Bakelite due to its high resistance to electricity and heat is used in automotive components and industrial applications. Melamine homologs such as melam, melem, and melon have even higher decomposition temperatures with 400 °C and above, but they have found only experimental use so far. Cleaned and dried plastic items are then melted at a regulated temperature and moulded into a new shape. Thermoplastic: Plastics that can be deformed easily upon heating and can be bent easily. Filed Under: Class 8, Synthetic fibres and Plastics Tagged With: bakelite, melamine, plastics, polythene, polyvinyl chloride, teflon About Mrs Shilpi Nagpal Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. Learn more. [45] By 1930, designer Paul T. Frankl considered Bakelite a "Materia Nova", "expressive of our own age". For your own safety, we recommend that you avoid melamine containers completely and use ones made of glass or stainless steel. The Bakelite Corporation adopted as its logo the mathematical symbol for infinity and the slogan, "The Material of a Thousand Uses," but they recognized no boundaries for their material. Bakelite is still commonly used for dominoes, mah-jongg tiles, checkers, and chess pieces. Bakelite is a thermosetting plastic. The material can be reheated, reshaped and cooled repeatedly i.e thermoplastics are recyclable. Question 13. While on the other hand, bakelite is a thermosetting polymer i.e it can not be recycled. Plastics are highly durable, lightweight and most importantly can be moulded into any form or shape. But to me, Bakelite will always have a special place in the history of plastics as the first truly modern plastic, one that people prized for its beauty, versatility, and durability. 3.Bakelite is a synthetic plastic and melamine is an organic compound. 6 7 Bakelite® phenolic molding compounds, when they were invented over a century ago, revolu- tionized the manufacture of household goods such as radios and lamp cases. These plastics retain their shapes and can not return to their original form i.e they are irreversible. Bakelite was the major form of “art plastic” from the 1930s through to the 1950s. Choose the thermoplastics and thermosetting plastics from the following: Melamine, Polythene, Bakelite, Polyvinyl chloride. We'll discuss whether it's safe to use and any risks. There are some well-known plastics around us. Question 14. ... Characteristics and uses. Melamine can be manufactured from Bakelite continues to be used for wire insulation, brake pads and related automotive components, and industrial electrical-related applications. For example: Polythene, toys, bags, chairs, table, boxes etc. Plastic bags contaminate food because of the poisonous dyes associated with them. As a manufacturer, you know these are the keys to making it in today’s world. Ask your question. It is also used to make various kitchenware products like frying pans etc. It is also used to … Plastic is a specific type of polymer that can change its shape. When melamine laminates are manufactured, theyre created by molding a melamine/formaldehyde combo into a durable plastic sheet. Plastic is a poor conductor of electricity and heat. Both Bakelite And Polythene Are Examples Of Plastics. 1. Why Then Is There A Concern Today About Their Increasing Usage? Some usage of plastics are given below: The ability to be moulded makes plastic an ideal packaging material. Once they are given a shape and cooled, they cannot be melted again to form a new shape. Uses of melamine. Bakelite definition, a brand name for any of a series of thermosetting plastics prepared by heating phenol or cresol with formaldehyde and ammonia under pressure: used for radio cabinets, telephone receivers, electric insulators, and molded plastic ware. Bakelite was used to make radios in the 1920s and 1930s. Question 1. The smallest molecule which has to be repeated again and again to form a long chain is called a monomer. 39. Polythene is a very commonly used plastic, mostly in the form of carry bags. 2.BAKELITE OCCURS NATURALLY AND BAKELITE IS MAN MADE. It is used in various industrial applications. They always pronounced it bake*light. It is used to make floor tiles, kitchenware and fire resistant fabrics. Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. Like cyanamide, it contains 67% nitrogen by mass, and its derivatives have fire retardant properties due to its release of nitrogen gas when burned or charred. The specific gravity of plastic is much lower making it an extremely lightweight material. Give two uses of PVC. Once it is moulded and becomes hard on cooling, it can't be softened again or reshaped. Recycling is a difficult process which involves many processing steps. Log in. These plastics retain their shapes and can not return to their original form i.e they are irreversible. Plastics are highly durable and can last for an indefinitely long period of time. Key Difference – Bakelite vs Plastic Plastic and Bakelite are both organic polymers, having a very large molecular weight though there exists a difference between the two based on their properties and usage. It has been aptly named as the ‘Material of a Thousand Uses’. Moreover, the burning of plastics releases poisonous smoke and toxic fumes, which causes air pollution and also cancer. Vedantu Jewelry designers such as Jorge Caicedo Montes De Oca still use vintage Bakelite materials to make designer jewelry. Ingestion of melamine may lead to reproductive damage, or bladder or kidney stones, and bladder cancer. Due to its excellent insulating properties it is used for making switches and other electrical appliances. Melamine and formaldehyde copolymerise to give another polymer. 33. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. Melamine is a type of plastic. 24.4 MELAMINE–PHENOLIC RESINS. Pro Lite, Vedantu Which of the following are thermosetting polymers? Special plastic cookware made of melamine is used in microwave ovens for cooking food. (Image to be added soon) Thermoplastics; Plastics that soften upon heating and return to their original form are called thermoplastics. They are polypropylene (chair, tables etc), polystyrene(plastic spoons & forks, cups etc), polyamide (usually known as nylon) used in toothbrushes, car-parts etc. Its insulation property is used for coating the electric wire and to make handles of cooking utensils and various household products. If accidentally consumed by stray animals such as cattle it can choke their digestive system. Join now. Melamine is a type of plastic. Write the full form of PVC. Answer: Teflon is used for nonstick coating on cookware. Due to its excellent insulating properties it is used for making switches and other electrical appliances. Vedantu academic counsellor will be calling you shortly for your Online Counselling session. In this video you will get concept of polymer based on condensation. Many things around us are made of plastics. Plastics are used to make safety gear like helmets, goggles etc. Melamine resin may be used in many aplications and has a very stable structure. Answer Melamine is a laminate, but not all laminates are melamine. See more. It is also an irritant when inhaled or in contact with the skin or eyes. Melamine / ˈ m ɛ l ə m iː n / is an organic compound with the formula C 3 H 6 N 6.This white solid is a trimer of cyanamide, with a 1,3,5-triazine skeleton. Science. Give one use of Teflon. so, the main differences between the two are... Bakelite is a thermosetting plastic, it cannot be molded again whereas Melamine, being a thermoplastic, can be molded … Formaldehyde resin-bakelite,urea formaldehyde resin, melamine formaldehyde resin. Melamine can be easily molded when warm. Metals, on the other hand, are much more prone to chemical and weather susceptibilities. Pro Lite, Vedantu Orientation of monomer units in a polymer molecule A. Tacticity B. Graft C. Linear D. 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