Phenolic(Bakelite) Vinyl Ester Resin; Cyanate Ester; Polyester; This is the complete explanation with its top 10 properties. When heat and pressure are applied to the layers, a chemical reaction (polymerization) transforms the layers into a high-pressure thermosetting industrial laminated plastic. Others are 'thermosetting': like eggs, they cannot revert to their original viscous state, and their shape is thus fixed for ever Bakelite had the distinction of being the first totally synthetic thermosetting plastic. Thermosetting plastics have high melting points and tensile strength. It is insolvent. Others are 'thermosetting': like eggs, they cannot revert to their original viscous state, and their shape is thus fixed for ever Bakelite had the distinction of being the first totally synthetic thermosetting plastic. (a) thermoplastic (b) polyester (c) thermosetting plastic (d) nylon Related: MCQ - Synthetic Fibers And Plastics? Whereas, polythene is a thermoplastic polymer i.e. Thermosets are in the liquid state before processing. This is hard and strong plastics. Hence, the correct answer is option (A). Q:-Give simple chemical tests to distinguish between the following pairs of compounds. 1 answer. Examples of thermosetting plastics include bakelite, urea-formaldehyde resins. Now, let’s discuss the Processing of Plastics. Thermoset vs thermoplastic, and Bakelite. Such plastics are called thermosetting plastic. Acrylic, polyethylene and polystyrene are thermoplastic. Plastic which cannot be melted and moulded repeatedly? Polymers can be separated into plastics and rubbers. Plastics will likely be divided into each thermoplastic or thermosetting plastics. Popular Questions of Class Chemistry. Which of the following characteristics does not affect the properties of plastics? I thought that thermosets were "set solid" by a chemical reaction that was irreversible. Thermosetting plastics have an excellent aesthetic appearance. Bakelite: Used to make plastic ware, vehicle disc brake cylinders, plugs and sockets, ... Thermosetting plastics have a relatively higher molecular weight when compared to thermoplastics. Thermoplastic properties: When you heat thermoplastics … Such plastics are called thermosetting plastic. So, option (C) and (D) are also not the solution to this question. Thermosetting plastics are hard and brittle in nature. 4. 3. Initially, the polymer is a liquid or soft solid. This reflects the fact that above Tg they may be shaped or pressed into molds, spun or cast from melts or dissolved in suitable solvents for later fashioning. 1 answer. Thermosetting plastics have primary bonds between molecular chains and held together by strong cross-links. Thermoplastics vs Thermosetting Plastics. The synthetic polymer which can be used as a substitute for wool for making; sweaters and shawls etc. | EduRev Class 8 Question is disucussed on EduRev Study Group by 118 Class 8 Students. The fabrication process for thermoplastic and thermoset start outs with the same raw materials, such as ethylene and propylene, made from crude oil. A thermosetting plastic is a polymer that irreversibly becomes rigid when heated. 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. Thermoplastic is used for making combs, toys, buckets, mugs, etc. The polymerization process creates the polymers used for making plastics. Bakelite is a) thermoplastic b) ployester c) thermosetting plastic d) Nylon 2. Hope this article is helpful to you. (i) A polymer is a chain of many small units joined together which are called _____. Few examples of thermosetting plastics are phenolic resins, epoxy resins, amino resins, melamine, Bakelite. PET is form of: (a) steel (b) glass (c) polyester (d) nylon. Understand the Key Differences Between Thermoplastic and Thermosetting Plastic with detailed explanations and examples. softening and hardening can be repeated again and again. b) Plastic bag, … I think you had understood about the properties of polymers, thermoplastics, and thermosetting plastics in a detailed way. Bakelite Phenolic is produced in dozens of commercial grades to meet mechanical, electrical and thermal requirements. Some are 'thermoplastic', which means that, like candlewax, they melt when heated and can then be reshaped. A number of glucose units make up the polymer a) Protein b) viscose c) cellulose d) Rayon 3. Thermoplastic is soft, weak and less brittle. In option A, it is given that bakelite is a thermoplastic. As engineering materials, they are relatively new compared to metals and ceramics, dating only from around the mid-1800 s. It is appropriate to divide them into the following three categories; Thermoplastic polymers (thermoplastics/TP) Thermosetting polymers (thermosets/TS) Elastomers (rubbers/E) Bakelite and melamine are examples of thermosetting plastic. Thermoset becomes hard when heated an example would be Bakelite. Hope this article is helpful to you. 22. Wire made from which fibre is strongest: (a) nylon (b) cotton (c) wool (d) steel. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Thermosetting plastics have a relatively higher melting points and tensile strength. Synthetic fibres a) wrinkle free b) dry quickly c) catch fire easily d) all of these 5. Thermoplastics are solvent in organic compounds. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Thermoplastic: Thermosetting Plastic: 1. Tångavägen 5, 447 34 Vårgårda info@futureliving.se 0770 - 17 18 91 Thermoplastics have low melting points and low tensile strength. Choose the thermoplastics and thermosetting plastics from the following: Melamine, Polythene, Bakelite, Polyvinyl chloride synthetic fibers and plastics class-8 Bakelite is a very poor conductor of heat and electricity and it is used for making electrical switches. Nov 25,2020 - Bakelite is -. Heat provides energy for chemical reactions that increase the cross-linking The plastics which cannot be softened by heating, when moulded once are called thermosetting plastics. Thermoplastic is a long-chain linear. once they are moulded and harden on cooling, they cannot be softened again. 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. Thermoset plastics are frequently used for sealed products due to their resistance to deformation and are also among some of the most impact resistant plastics available. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. The crude oil contains hydrocarbons, which make up the monomers. Thermoplastic is lower in molecular weight, compared to thermosetting plastic. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Question 5. Bakelite is a thermosetting polymer i.e. Thermoplastic and Thermosetting plastic are two separate forms of polymer powders, which are differentiated based on their behavior when reacting to the application of heat. Basically there are two types of thermoplastic, thermoset and thermoform. Thermoplastic is a form of a polymer which will likely be merely melted by providing heat in an effort to recycle the material. Melamine is not thermoplastics, it is thermosetting plastic. As in, if you heat up the plastic after it sets, it burns instead of melts. Answer (a) nylon Wire made from nylon fibre is the strongest. Phenolic(Bakelite) Vinyl Ester Resin; Cyanate Ester; Poly Ester; This is the complete explanation with its top 10 properties. (a) Thermoplastic (b) PET (c) Thermosetting plastic … Plastics are divided into two groups depending on how it reacts to heat. Fill in the blanks. Engineering thermoplastic performance is governed by the architecture of the polymer backbone, which determines the strength, rigidity, softening temperature, Tg, and melt temperature, Tm, (if crystalline) of the matrix. Also, thermoplastics can be deformed easily, while thermosetting plastics cannot. Thermoplastics vs. Thermosetting Plastics. Write the full form of PVC. Question 4. asked Jun 20 in Chemistry by BhratJha (44.3k points) synthetic fibers and plastics; class-8; 0 votes. 4. But it is not. 4. Bakelite and melamine are examples of thermosetting plastic. Is it thermoplastic or thermosetting plastic? Thermosetting plastics have extreme thermal stability, extreme dimensional stability, and extreme thermal and electrical insulating properties. Synthetic fibres cause soil pollution because they are a) Biodegradable b) Non - biodegradable c) Tough d) soft 4. Thermoplastics can be repeatedly softened by heating and hardened by cooling.Thermosetting plastics, however, harden permanently after being heated once. Thermoplastic polymer chains are free to move past each other and separate when subjected to heat (melt), chemicals (dissolve) or load (cold flow or creep). 2. Now, let’s discuss the Processing of Plastics. Bakelite is used for making electrical switches and switchboards because it is a poor conductor of heat and electricity. are : (a) Nylon (b) Terylene (c) Polyester (d) Acrylic. What is the difference between thermoplastic and thermosetting plastics? Such a material is also known as a thermoset or thermosetting polymer. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. they can be softened by heating only once i.e. Thermosetting Plastic: Some plastics do not get deformed on heating, and cannot be re-molded into a new shape. Bakelite is a thermosetting plastic. In lab I made samples that were mounted in bakelite. Thermosetting Plastic: Some plastics do not get deformed on heating, and cannot be re-molded into a new shape. Previous Question Next Question. (a) Bakelite (c) Wool (c) Nylon (d) Cotton. Thermosetting vs. Thermoplastic Polymers Last updated; Save as PDF Page ID 5435; Contributors; Most of the polymers described above are classified as thermoplastic. I think you had understood about the properties of polymers, thermoplastics, and thermosetting plastics in a detailed way. ... Related questions 0 votes. Thermosetting Plastic can not be reshaped. 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