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2003 Course Rubber Technology (Elective)

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Total No. of Questions :12] P1314 [Total No. of Pages :3 [3864]-386 B.E. (Polymer) RUBBER TECHNOLOGY (Elective) (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) Answer any three questions from each section. Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Use of logarithmic tables, slide rule, Mollier charts electronic pocket calculator and steam tables is allowed. Assume suitable data, if necessary. SECTION - I Q1) Define Compounding. List various ingredients used in rubber compounding. Give the role of each ingredient with suitable examples. [16] OR Q2) Show the various steps in dry rubber technology with the help of a block diagram. Explain coagulation, pale crepe, smobed sheet and mastication in detail. [16] Q3) What is vulcanisation? Explain the process of vulcanisation giving chemical reactions of at least 3 commercial elastomer materials. [16] OR Q4) List the factors affecting the process of vulcanisation. Discuss in detail various techniques of vulcanisation. [16] Q5) Answer the following: a) b) c) List the molecular criteria for a material to behave as an elastomer. [4] Classify rubber materials in suitable groups. [3] List the changes in the rubber material after vulcanisation. [4] P.T.O.

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