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? 
b) W.r.t molecular orientation explain why aromatic polyamide fibers have higher moduli and strength as compared to aliphatic polyamides? 
c) Enlist various characteristics of Liquid crystalline phase. 
d) Give two examples and two applications of Thermotropic and Lyotropic LCPs. 
Q2) a) Referring to the figure below identify various phases of liquid crystalline polymers. Comment on the peculiar characteristics of these phases. 
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. 
c) What do you understand by Isotropic phase and Anisotropic Phase? Explain their role in liquid crystalline phase formation. 
With suitable example explain the development of band structure in Conducting Polymers. 
Write the note on Solvents and Electrolytes used in Electrochemical Synthesis route of conducting polymers. 
Explain in detail, alongwith various reactions involved, the application of conducting polymers in Lithium Rechargeable Batteries. 
Explain Template Polymerization technique and its significance with suitable example. 
What do you understand by Solvatochromism, Thermochromism and Electrochromism? 
Write a short note on Use of Conducting Polymers in Light Emitting Diodes (LEDs). 
An isothermal TGA thermogram is given in Figure I. Comment of the usefulness of given polymers in heat resistant application. 
Explain the terms Ablation and Ablative Polymers. Explain the role of ablative polymers in spacecraft applications. 
Write a short note on “Heat Resistant Polymers as Structural Resins in Aerospace Applications”. 
Although the primary bond strength of most inorganic polymers are high, very few are useful as heat resistant polymers. Explain. 
b) Enlist the Polymeric Properties and Characteristics which affect the performance of Ablative Polymers. 
SECTION – II
Q7) a) Enlist various types of polymeric coating additives. 
b) What do you understand by the term “Membrane”? What are the advantages of membrane technology compared to other unit operations in chemical engineering? 
c) Explain working of photosensitive polymers? Give two examples of materials used as positive and negative photoresists? 
Q8) a) What are the various requirements for polymer to work as coating additive? 
b) Enlist the parameters which act as driving force to cause trans-membrane gradient, thereby, passive transport through membranes. 
c) Classify the membranes and membrane processes used for separations via passive transport. 
d) Write a short note on “Photolithography”. 
Q9) a) Alongwith the reactions involved explain in detail synthesis of poly (lactic acid). 
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? 
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). 
b) What are the structural criteria required to classify the given polymer under Biodegradable category? 
QII) Write short note on following (any three) : 
- Polymers used in –
a) Mulches and Green Houses;
b) Food Contact Applications;
c) Drug Delivery;
d) Aerospace applications.
Q12) Write short note on following (any three) : 
- Applications of Polymers in –
a) Building and Construction;
d) Seed-coating (Agricultural).