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