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2003 Course Rubber Technology (Elective)

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Total No. of Questions : 12] P1524 [Total No. of Pages : 3 [3764]-356 B.E. (Polymer) RUBBER TECHNOLOGY (2003 Course) (Backlog) (Elective) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Your answers will be valued as a whole. 6) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 7) Assume suitable data, if necessary. SECTION - I Q1) a) b) Q2) a) b) Explain the various stages in the raw rubber technology. [8] What are the molecular - structure requirements for a material to act as a rubber? [8] OR Explain the thermodynamic theory for rubber elasticity. [8] Define the following terms: i) Scorch. ii) Mastication. iii) Reversion. iv) Vulcanisation. [8] Q3) a) List the various types of C-blocks and differentiate between them. [8] b) Explain the need for addition, mechanism of functioning and two examples of each of the following additives w.r.t. rubbers. [10] i) Peptizers. ii) Tackifiers. iii) Antiozonants. OR P.T.O. 1

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