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