M.Sc. (Semester IV) (CBCS) Examination Mar/Apr-2018
Polymer Chemistry
SELECTED TOPICS IN POLYMERS
Time: 2½ Hours
Max. Marks: 70
Instructions: Attempt five questions. Section-I is compulsory. Attempt any two questions from Section-II Attempt any two questions from Section-III All question carry equal marks. Figures to the right indicate full marks. Use of log table and non programmable calculator is allowed.
Section I
Q.1
Answer the following.
14
What are the important applications of poly (vinyl cyclohexane)?
What are biocides? Explain the role of biocides in processing of rubber.
Epoxy resins are used as excellent adhesive, Give reasons.
Draw the structures of repeat unit of cellulose and amylase. Bring out basic difference in their structure.
Write any four important characteristics of good paint.
Define the term of accelerator and mention two examples with their structure.
List out any four advantages of vulcanized rubber over gum rubber.
Section II
Q.2
Describe different methods of sortation used in waste polymer recycling.
07
Discuss the classification of varnishes. Bring out importance of each constituent used involved in varnishes preparations.
07
Q.3
What is lithography; In brief explain the negative mode of working of a photoresist. Draw a suitable diagram.
07
What do you mean by the compounding of rubber? Explain the role of filler, flame retardant and antioxidants additives in the compounding of rubber. Give two each suitable examples of filler, flame retardant and antioxidant.
07
Q.4
Discuss the role of polymer supported and reagents in organic synthesis with suitable examples.
07
Explain the meaning of term DS and MS and discuss the solution process for synthesis of celluloses acetate. Describe two different methods used for its characterization.
07
Section III
Q.5
What is doping? Mention various types of doping suitable examples.
05
Draw the chemical structure of repeating unit for Nitrile Rubber and mention their important properties and applications.
05
Explain the term incinerations and describe the process of incinerations used for polymers.
04
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SLR-UF-206
Q.6
Draw the flow diagram for manufacture process for paint.
05
Give historical review of natural rubber and explain how its chemical structure is assigned.
05
Kevlar show Lyotropic LCP behavior give reasons and explaining the conditions should to show LC behavior?
04
Q.7
Write a note on any Three of the following.
14
Polymers in control drug release applications
Reasons for failure of paint films and its prevention
Silicone resin with properties and applications
Epoxiation of natural Rubber
Modified cellulose esters