Download GTU BE/B.Tech 2018 Winter 5th Sem New 2152306 Chemistry Of Plastic Materials Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER-V (NEW) EXAMINATION - WINTER 2018

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Subject Code:2152306

Subject Name:Chemistry of Plastic Materials

Date:20/11/2018

Total Marks: 70

Time: 10:30 AM TO 01:00 PM

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

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1. (1) The Mn of Polypropylene is 10⁶gm/mol. Find the DPn. 03
2. (2) Define Homopolymer and co-polymer. 04
3. (3) List the generalized steps for polymerization. 07

Q.2

1. (1) Polymers formed by addition polymerization are less crystalline than polymers formed by condensation polymerization. Why? 03

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2. (2) Give one example of alternating and block copolymers with structure. 04
3. (3) What is difference between Buna-N and Buna-S rubber? 07

Q.3

1. (4) Give the classification of Polymer on the basis of Polymerization process. 07
2. What is a Polymer? Explain Addition and Condensation Polymerization with suitable example & Enlist polymerization techniques. 03

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3. Short note on: Natural Polymer Starch and Lignin. 04

OR

1. Give chemical structure of PTFE. Discuss the properties of PTFE. 07
2. Give ten differences between Thermoplastic and Thermoset. 03
3. What is functionality? State the functionality of the monomers:-styrene, pentaerythritol, 1, 4-butane diol, ethylene glycol. 04

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Q.4

1. Define : Thermoplastic ,Thermoset and Polymer 07
2. Explain about addition polymerization with example. 03
3. Give classification of Polymer in detail with example. 04

OR

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1. Write chemistry of formation of Melamine Formaldehyde (MF) 07
2. Explain the manufacturing process of MF with flow diagram. 03
3. Discuss Carothers’ Equation in detail. 04

Q.5

1. Give chemical structure of the following polymer: (1) PE (2) PVC (3) ABS 07

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2. Explain in brief about Tapping (Extraction) of Latex. 03
3. Explain the mechanism of Anionic addition polymerization in detail. 04

Q.4

1. (a) Calculate the number average degree of polymerisation of an equimolecular mixture of hexamethylenediamine and adipic acid for the extents of reaction 0.4 and 0.8. 3
2. (b) What is natural rubber? Give the structure of polyisoprene. 04

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3. (c) Explain various types of bonding exist in polymers with example. 07

Q.5

1. (a) In the polymerisation of w-hydroxy -caproic acid, HO(CH₂)₅COOH, a 2% impurity present. Calculate the degree of polymerisation of polymer formed. 03
2. (b) What is compounding. Explain vulcanization of rubber in brief. 04
3. (c) Derive the following equation for free radical polymerization Rp=Kp (Kd/Kt=){( £[I]") [M]} 07

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OR

1. (a) Derive the equation between number average degree of polymerisation (P) and Kinetic chain length (y). 03
2. (b) Discuss chemistry, properties and application of HDPE. 04
3. (c) Write structure, properties, and application of chlorinated rubber. 07

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