Pune University BE Polymer Speciality Polymers and Applications Question Papers

Pune University Exam Paper

B.E. (Polymer) SPECIALTY POLYMERS AND APPLICATIONS (2008 Pattern)

(Elective – III) (Sem. – II)

Time : 3 Hours]                                                                                            [Max. Marks : 100

Instructions to the candidates:

1)         Answers to section-I and section-II should be written on separate answer book.

2)          Solve 3 questions from section-I and three questions from section-II.

3)          Neat diagrams should be drawn whenever necessary.

4)          Figures to right indicate full marks.

5)         Assume suitable data, if necessary.

6)          Use of electronic pocket calculator is allowed.

SECTION – T

QI) a) On the basis of molecular ordering explain how liquid crystalline phase is different from solid and liquid phase?                                                                                      [4]

b)        W.r.t molecular orientation explain why aromatic polyamide fibers have higher moduli and strength as compared to aliphatic polyamides? [4]

c)         Enlist various characteristics of Liquid crystalline phase.                  [6]

d)        Give two examples and two applications of Thermotropic and Lyotropic LCPs.          [4]

OR

Q2) a) Referring to the figure below identify various phases of liquid crystalline polymers. Comment on the peculiar characteristics of these phases. [8]

 

b)            With neat sketch explain the effect of solution concentration and shear rate on the viscosity of Lyotropic Solutions. Also, explain its importance in fiber/film formation.                                                                                                                             [6]

 

c)                                                                                                                                                                                                                                                                      What do you understand by Isotropic phase and Anisotropic Phase? Explain their role in liquid crystalline phase formation.                                                                                                         [4]

With suitable example explain the development of band structure in Conducting Polymers.                                                                                                                                      [6]

Write the note on Solvents and Electrolytes used in Electrochemical Synthesis route of conducting polymers.                                                                                                [4]

Explain in detail, alongwith various reactions involved, the application of conducting polymers in Lithium Rechargeable Batteries.                                                                        [6]

OR

Explain Template Polymerization technique and its significance with suitable example. [6]

What do you understand by Solvatochromism, Thermochromism and Electrochromism?                                                                                                                                      [6]

Write a short note on Use of Conducting Polymers in Light Emitting Diodes (LEDs).     [4]

An isothermal TGA thermogram is given in Figure I. Comment of the usefulness of given polymers in heat resistant application.                                                                   [5]

Enumerate and explain in brief various structural features responsible for building heat resistance in polymers.                                                                                             [7]

Explain the terms Ablation and Ablative Polymers. Explain the role of ablative polymers in spacecraft applications.                                                                                            [4]

OR

Write a short note on “Heat Resistant Polymers as Structural Resins in Aerospace Applications”.                                                                                                            [6]

Although the primary bond strength of most inorganic polymers are high, very few are useful as heat resistant polymers. Explain.                                                                            [4]

b)        Enlist the Polymeric Properties and Characteristics which affect the performance of Ablative Polymers.                                                                                             [6]

SECTION – II

Q7) a) Enlist various types of polymeric coating additives.                                          [3]

b)        What do you understand by the term “Membrane”? What are the advantages of membrane technology compared to other unit operations in chemical engineering?  [6]

c)        Explain working of photosensitive polymers? Give two examples of materials used as positive and negative photoresists?                                                         [7]

OR

Q8) a) What are the various requirements for polymer to work as coating additive?        [3]

b)        Enlist the parameters which act as driving force to cause trans-membrane gradient, thereby, passive transport through membranes.                                    [3]

c)         Classify the membranes and membrane processes used for separations via passive transport.                                                                                                      [4]

d)        Write a short note on “Photolithography”.                                            [6]

Q9) a) Alongwith the reactions involved explain in detail synthesis of poly (lactic acid).           [8]

b) Compare between Poly (lactic acid), Poly (caprolactone) and Poly (glycolic acid) w.r.t. the following properties – Tg, Tm and degradation time. Which of these polymers will be preferred for degradable sutures on the basis of degradation time?          [8]

OR

QI 0) a) Is poly (glycolic acid) a Natural or Synthetic biopolymer? Justify your answer. Write a short note on Synthesis of poly (glycolic acid). [8]

b)        What are the structural criteria required to classify the given polymer under Biodegradable category?                                                                                  [8]

QII) Write short note on following (any three) :                                                           [18]

  • Polymers used in –

a)        Mulches and Green Houses;

b)        Food Contact Applications;

c)        Drug Delivery;

d)        Aerospace applications.

OR

Q12) Write short note on following (any three) :                                                         [18]

  • Applications of Polymers in –

a)        Building and Construction;

b)        Cosmetics;

c)         Optics;

d)        Seed-coating (Agricultural).

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