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