As polymers are single, giant molecules i.e. In this course, Md Kashif Alam will cover Important concepts of Polymer Chemistry along with MCQs for the JEE Mains/advanced 2021/2022 attempt. Saran is a copolymer of vinyl chloride and Isused for wrapping food materials. is known as polymerisation. Answer/Explanation. These numbers refer to the number of carbon atoms in diamine and in the dibasic acid. Question 1: Write the names and structures of the monomers of the following polymers: (i) Nylon-6,6 (ii) Bakelite (iii) Polystyrene Answer: Question 2: Write the names and structures of the monomers of the following polymers: (i) Glyptal (ii) Teflon (iii)Nylon-6 Answer: Question 3: Write the name and structures of the monomers of the following polymers: (i) Buna-S (ii) Glyptal (iii) Polyvinyl chloride Answer: Question 4: Write the names and structures of the monomers of the following polymers: (i) Nylon-6 (ii) Novolac (iii)B… Polymers are formed in two general ways. Copolymerisation: It is a process in which a mixture of more than one monomeric species polymerize to form a copolymer. Huge List of CBSE Chemistry Projects for Class 12, Chemistry Science Fair Projects Free Download, Models, Experiments, Winning CBSE Chemistry Science Experiments,cool and fun interesting investigatory project for chemistry for Kids and also for Middle school, Elementary School for class 5th Grade,6th,7th,8th,9th 10th,11th, 12th Grade and High School , MSC and College Students. NCERT Solutions for Class 12 Chemistry Chapter 6 – Polymers. In other words, such polymers are more homogeneous. This will help the candidates to know the solutions for all subjects covered in Class 12th. This document is highly rated by Class 12 students and has been viewed 983 times. Classification of the Polymers:- Classification on the basis of repeating structural unit:-. For the sake of the candidates we are providing Class 12 Mock Test / Practice links below. In this chapter, you will study what polymers are and how they are formed. Chain Growth Polymerisation or Addition Polymerisation. It is a condensation product of ethylene glycol and terephthalic acid. Examples of cross linked polymers are bakelite, glyptal, melamine-formaldehyde polymer etc. It has moderate tensile strength but good tearing strength. Here we have provided Exemplar Problems Solutions along with NCERT Exemplar Problems Class 12. of monomer units through covalent bonds in a regular fashion Examples:- Buna-s, Buna-N, polyesters-polyethene, Butadiene.. This chapter explains the mechanical properties and applications of polymers. The winner will be announced in early spring. The word “Polymer” is derived from two Greek words, ‘Poly’ that means many (numerous) and ‘Mer’ which means units. Here we have covered Important Questions on Polymers for Class 12 Chemistry subject. The most commonly used catalysts are benzoyl peroxide, hydrogen peroxide or t-butyl peroxide etc. which means many units (parts). It is also chemically inert and more tougher and harder. Nylon-6 is obtained by heating caprolactam with water at a high temperature. Classification of Polymers Based on Mode of Polymerisation. As polymers are single big size molecules, they are also called  macromolecules. It is obtained by polymerising propylene in the presence of Ziegler-Natta catalyst. The polymers which contain an amide linkage in chain are known as pOlyamide, e.g., nylon-6, 6. Class 12 Chemistry Maths Notes Physics Notes Biology Notes. These weak binding forces permit the polymer to … Our NCERT Solutions for Class 12 Chemistry Chapter 15 – Polymers are user friendly and have been created by a team of Science experts. So, go ahead and check the Important Notes for Class 12 Chemistry Polymers. The polymers which contain an ester linkage are known as polyester, e.g., dacron. On the contrary, synthetic polymers generally have PDI > 1 which means that they are less homogeneous. It is prepared by the polymerisation of methylmethacrylate in the presence of suitable organic peroxide. These crosslinks tend to limit the motion of chains relative to each other. It is, therefore, used in the manufacture of paints and lacquers. The word polymer has a Greek origin. Polymers are also called macromolecules due to their large size but converse is not always true. big size molecules, they are also called macromolecules Monomers: The simple molecules which combine to form polymers by forming single or multiple bonds are […] The molecules of the same monomer or different monomers add together on a large scale to form a polymer. Polymers have a high molecular mass (10 3 − 10 7 u). The process of heating a mixture of raw rubber and sulphur at 373 K to 415 K is known as vulcanisation of rubber. Step III Chain termination step There are three ways of chain termination: Coupling reaction, disproportionation reaction, chain transfer reaction. Polymers in the natural world have been around since the beginning of time. The molecules of the same monomer or different monomers add together on a large scale to form a polymer. Mock test are the practice test or you can say the blue print of the main exam. Difference between Polymers and Macromolecules. The word ‘polymer’ is coined from two Greek words: poly means many and mer means unit or part. Chemistry. The concepts should be clear which will help in faster learning. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. In these polymers, the monomers are joined together to form long straight chains of polymer molecules. The polyamides are identified by numbers. 3. The polymer chains are held together by the weakest intermolecular forces. It is used as a substitute for wool in making commercial fibres as orIon or acrilan. It has higb water absorption capacity. These polymers are obtained by the condensation reaction of phenol with formaldehyde in the presence of either acid or a base catalyst. a) In chain-reaction polymerization. 10. Classification of polymers on the basis of source: These are called biopolymers, e.g., polysaccharides, proteins, nucleic acids, etc. Polymers have a high molecular mass (10 3 − 10 7 u). A polymer is a large molecule of high molecular mass formed by the repetitive bonding of many small molecules called monomers. Classification of Polymers Based on Source of Origin. Polymer is defined as a chemical substance of a high molecular mass formed by the combination of a large number of simple molecules, called monomers. In basic terms, a polymer is a long-chain molecule that is composed of a large number of repeating units of identical structure. The word polymer has a Greek origin. propene. Dimer, trimer and tetramer are the number of structural units present in the polymer. (c) Thermoplastics. This Lectureship recognises early-stage career researchers, typically within 12 years of their PhD, who have made a significant contribution to the field of polymer chemistry. Soft bakelites with low degree of polymerisation are used as binding glue for laminated wooden plants, in varnishes and lacquers. It can be used only in the temperature range 10°C-50°C. Polymers Class 12 2. It is also used for preparing magnetic recording tapes, conveyer belts, aprons for industrial workers etc. (i) Natural polymers Those polymers which occur in nature. For this polymerisation monomers used are unsaturated compounds like alkenes; alkadienes and their derivatives. The process by which the monomers are transformed into polymers is called polymerisation. Candidates must try mock test as it helps the students learn from their mistakes have been around since the of. 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