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2003 Course Polymer Structure & Property Relationship

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Total No. of Questions : 12] [Total No. of Pages : 4 P1317 [3664]-293 B.E. (Polymer) POLYMER STRUCTURE AND PROPERTY RELATIONSHIP (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer three questions from Section - I and three questions from Section - II. 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) Assume suitable data, if necessary. SECTION - I Q1) a) Explain the reason for variation in density and melting point of PP, LDPE & HDPE. [5] b) Write a short note on how following factors are affected due to chemical composition of polymers [8] i) Density. ii) Flammability. iii) Charring. iv) Moisture absorption. v) Wheatherability. Out of N - 66 & N - 6, which absorb more moisture and why? [3] What is an isocynate linkage? [2] c) d) OR Q2) a) Explain the bonds carbon atom makes with other atoms & thus the properties. [8] b) Write a short note on LCP. [5] c) Write a note on the bonds formed by oxygen atom & its effect on properties. [5] P.T.O.

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