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