Anna University Polymer Rheology Exam Paper

Anna University Polymer Rheology Exam Paper

POLYMER RHEOLOGY

Time: 3hrs                                                                                                 Max Marks: 100

Answer ALL Questions                                                                        PART – A (10 x 2 = 20 marks)

1.What is called viscous energy dissipation?

2.Define flow curve.

3.What are called thirotropic fluids?

4.What is the usefulness of Williams – Landell – Ferry equation?

5.Define creep recovery and elastic recovery?

6.What is meant by dynamic mechanical analysis?

7.What is the cause of non-Newtonian behaviour of polymer melts?

8.How does rheological behaviour influences the mechanical properties of finished products?

9.What is the principle of rheo optics? Mention its applications?

10.What are the shear rates approximately required for polymer melts during processing?

 

PART – B (5 x 16 = 80 marks)

Question 11 is compulsory

 

11.Discuss the viscoelastic behaviour of polymeric materials?                            (16)

 

12.a)How are the flow properties of polymers measured?

Discuss the importance of capillary rheometers.                                             (16)

 

(OR)

12.b)Discuss the Boltzmann super positive principle.                                             (16)

 

13.a) Describe the stress relaxation by Maxwell Element.                                       (16)

(OR)

13.b)Discuss the dynamic mechanical analysis using relaxation spectra.                (16)

 

14.a) Explain non-Newtonian flow behaviour of polymer melts.                            (16)

(OR)

14.b) Discuss the importance of polymer rheology towards polymer procession.   (16)

 

15.a) What are the different types of birefringence? How is useful to study the stress  relaxation of polymers?                                                                                   (16)

(OR)

15.b)How is thermodynamic interactions in polymer measured using the rheo optics?

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