M.Sc. (Semester IV) (CBCS) Examination Nov/Dec-2018
Polymer Chemistry
PROCESSING TECHNOLOGY AND POLYMER PROPERTIES
Time: 2½ Hours
Max. Marks: 70
Instructions: Attempt in all five questions. Section is compulsory Attempt any two questions from section II and section III. Answer to all questions should be written in same answer book. All questions carry equal mark. Figures to right indicate full marks. Use of log table non programmable calculator is allowed.
Section I
Q.1
Answer the following:
14
What is the role of screw extruder in extrusion moulding?
What is gloss?
How hollow articles are made by polymer processing?
What is dilatants fluid?
What is acid value?
Give few examples of conducting polymer.
What is dielectric strength?
Section II
Q.2
Explain Voit or Kelvin model. How it is useful to explain creep?
07
What is spinning method? Explain types of spinning process.
07
Q.3
Describe extrusion moulding process with neat labeled diagram. What types of article made by this process?
07
Explain Maxwell model. How it is useful to explain stress relaxation?
07
Q.4
Explain DMA behavior of polymer material.
07
What are the methods used for testing of polymer material.
07
Section III
Q.5
Describe calendaring process for polymer material.
05
What is Thermoforming method? Explain in detail.
05
What are the mechanical properties of viscoelastic material?
04
Q.6
Explain the dielectric relaxation in polymer material.
05
Describe the rotational moulding.
05
What is HDT? How it is determined.
04
Q.7
Write a note on any Three of the following.
14
Post spinning process
Yellowness index
Conducting polymer
Bulk density