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