Class 12th Chemsitry - Polymers Case Study Questions and Answers 2022 - 2023
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Polymers Case Study Questions With Answer Key
12th Standard CBSE
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Reg.No. :
Chemistry
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Polymers are backbone of modern civilisation. We are using polymers in our daily life to lot of extent. Automobile tyres are made up of Buna-S. Nylon is being extensively used for making socks and stockings, climbing ropes, fishing nets. Bakelite is used for making combs and electrical switches. Teflon is coated to make non-stick kitchen wares. Plastic eating bacteria is capable of breaking down poly (ethylene phthalate) (PET) and consuming as a sole carbon and energy source. Single use plastics are quite harmful. Biotlegradable polymers like PHBV, Nylon-2, Nylon-6, Polylactic acid, poly glycollic acid have been discovered which are very useful and ecofriendly.
(a) Name a biodegradable polymer used in control during release and orthopaedic devices.
(b) Name a biodegradable step growth polymer used for sutures after surgery and give its monomers .
(c) How can plastics be converted into fuels?
(d) Can we use polythene in making roads?
(e) Why is bakelite used for electrical switches and switch boards? -
Study the table related to tensile strength of polymers and answers the questions based on table and related concepts.
Polymer Tensile Strength (MPa) Polycarbonate 70 HDPE 15 Polyethylene Terephthalate 55 Polyamide 85 Nylon 82.7 (a) Arrange Nylon, polyester, cotton, wool and silk in weaving order of tensile strength.
(b) Give repeating unit of Nylon-66
(c) Which type of polymers are used in bullet proof vests?
(d) Why do thermoplastic soft on heating?
(e) What is repeating unit of Terylene? -
Observe the graph between stress and strain for some types of plastics and answer the questions based on graph and related studied concepts.
(a) Which type of polymers have more elasticity but less tensile strength?
(b) Why is High density Polythene (HDP) is tough whereas LDP (low density polythene) Flexible?
(c) Which property of teflon makes it suitable for non-stick kitchen wares?
(d) Why is Nylon used in parachute fabrics?
(e) Name the polymer used in making unbreakable Crockery.
(f) What type of polymer is urea formaldehyde resin?
(g) Name an elastomer which is non-inflammable used in making conveyor belts in coal mines.
(h) Name an elastomer used for automobile tyres.
(i) How can we increase tensile strength of Natural rubber?
(j) Arrange Nylon-6,6, Polythene, Buna-N in increasing order of forces of attraction.
Case Study
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Answers
Polymers Case Study Questions With Answer Key Answer Keys
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(a) PHBY (Poly \(\beta\)-hydroxy butyrate-Co-\(\beta\)-hydroxy valerate)
(b) Nylon-2, Nylon-6. (its monomers are glycerine and Amino Caproic acid)
(c) Plastics can be converted into hydrocarbons (fuel) by heating in absence of oxygen (pyrolysis) at high temperature. It is called hydro-thermal processing.
(d) Yes, polythene can mixed with coal tar to make smooth roads.
(e) It is thermosetting plastic and is not affected by heating. -
(a) Silk < Wool < Cotton < Polyester < Nylon.
(b)
(c) Polycarbonate
(d) They have less intermolecular force of attraction,
(e)
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(a) Elastomers.
(b) HDP is linear and has more forces of attraction as compared to LDP which is branched chain.
(c) It is heat resistant.
(d) It has high tensile strength and light in weight.
(e) Melamine-formaldehyde resin.
(f) It is thermosetting polymer.
(g) Neoprene is elastomer which is non-inflammable due to presence of chlorine atoms.
(h) Buna-S.
(i) It can be done by vulcanization.
(j) Buna-N < Polythene < Nylon-6,6
