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