Download GTU BE/B.Tech 2019 Summer 3rd Sem New 2132301 Introduction To Plastic Material Science Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER-III (NEW) EXAMINATION - SUMMER 2019

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Subject Code: 2132301

Subject Name: Introduction to Plastic Material Science

Time: 02:30 PM TO 05:00 PM

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q1

1. Define: Monomer, Homochain Polymer, Initiator [03]
2. Give functionality of: (i) HOOCCH2COOH (ii) C6H5CH2OH (iii) CH2CH(OH)COOH (iv) H2NCH2(CH2)5CH2NH2 [04]

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3. Give classification of Polymers giving suitable examples. [07]

Q2

1. Describe Bulk polymerization technique with advantages. [03]
2. Give structures of: PVC, PAN, PMMA, PP [04]
3. Differentiate between low molecular weight compound and polymers. [07]

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OR

1. Explain various steps of Cationic Polymerization. [07]

Q3

1. Discuss: Linear, Branched and crosslinked polymer structures. [03]
2. Give difference between Step and Chain polymerization. [04]

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3. You have a polymer sample that contains the following molecules: [07]
   Mi, g/mol N
   1,000,000 2
   700,000 5
   400,000 10
   

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   100,000 4
   50,000 2
   Total 23
   What are Mn, Mw and the polydispersity index?

OR

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1. Calculate the contour length and the extended chain length of PE Mol. [07]
   Given: - n =5000., Bond angle-109°28', Segment length -1.54 Å.

Q4

1. Write a note on: Suspension Polymerization. [03]
2. List the types of Chain Polymerization? Explain Free radical Polymerization in detail. [04]

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3. Calculate the degree of polymerization of a sample of polyethylene [(CH2-CH2)n], which has a molecular weight of 150,000 g/mol. [07]

OR

1. What are inhibitors? Give its types and its uses. [03]
2. Explain effect of crystallinity on the properties of Polymer. [04]
3. Discuss about the tacticity of polymers with example. [07]

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Q5

1. What do you mean by Homopolymer and Copolymer? List the types of copolymers and explain them with suitable example. [03]
2. Explain factors influencing the Glass transition temperature with suitable examples. [04]
3. Plot graph for specific volume v/s temperature for highly crystalline, amorphous and partially crystalline polymers and explain. [07]

OR

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1. Explain Polydispersity & Molecular weight distribution in polymers. [03]
2. Explain relation between: Tg & Molecular weight [04]
3. Explain Emulsion Polymerization technique with schematic diagram. [07]

Date: 04/06/2019

Total Marks: 70

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