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2003 Course Polymer Structure & Property Relationship

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Total No. of Questions : 12] P1492 [Total No. of Pages :3 [3764] - 351 B.E. (Polymer) POLYMER STRUCTURE AND PROPERTY RELATIONSHIP (2003 Course) Time : 3 Hours] [Max. Marks:100 Instructions to the candidates: 1) Answer 3 questions from Section I and 3 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) What leads to charring in polymers. [2] b) Explain chromophoric effect. [2] c) Explain role of atoms on density. [2] d) Explain role of atoms on Hammability. [2] e) Give the effect of wheathering on polymer. [2] f) Explain the effect of presence of H-atom in any polymeric structure and also the type of bonds if forms. [8] OR Q2) a) Explain the type of bonds oxygen atom makes and thus the effect on properties. [6] b) Explain the type of bonds nitrogen atom makes and thus the effect on properties. [6] c) Explain the type of bonds carbon atom makes and thus the effect on properties. [6] P.T.O. Q3) a) b) Write short note on role of chemical groups in adhesion. [6] Give the various types of available additives that are available in the market and in short give the role played by each of them when added to polymer. [10] OR Q4) a) Corelate procenability with viscosity in various processes like injection, extrusion, spinning etc. [6] b) Even though the structural formula of LDPE and HDPE is same, why do they differ in properties like M.P, density, etc. [4] c) For PVC & PVDC, show their structure & justify which one has high Tg. [3] d) In ps what all modifications can be made to make it less brittle. Q5) a) [3] b) Explain what is meant by M.W.D. Also explain what is NMWD & BMWD. How do they both affect the properties of a polymer. Explain with egs. [8] Explain action of a plasticizer. [4] c) Explain the significance of structure on dielectric constant. [4] OR Q6) a) b) Draw plot of impact strength v/s MFI for NMWD and BMWD for two grades having density 0.950 and 0.960 gm/cc. [9] Give the factors affecting dielectric constant. [7] SECTION - II Q7) a) What is meant by amorphous and semicrystalline polymers. Explain with egs. [6] b) Give list of factors that can be used to obtain a tailor made polymer. [6] c) Write note on thermoplastics, thermosets & elastomers. [6] OR Q8) a) b) Explain the effect of structure on various polymer properties with eg.[10] Explain what is meant by freedom of rotation. Explain with egs. [3764]-351 2 [8] Q9) a) Discuss flexibility-structure relationship in detail. [10] b) In PMA and PMMA, which one will have higher Tg and why? [2] c) Will ps or 2,6, dimethyl ps will have higher Tg and why? [2] d) Explain why poly (butyl acrylate) is niffery and poly (methyl acrylate) is stiffly flexible. [2] OR Q10)a) b) c) Explain role of polarity on polymer properties. [4] What is the effect of orientation on properties. & how is it different from crystallisation. [6] What are the structural criterias to get a polymer undergo better crystallisation. [6] Q11)a) Explain fringed micelle model. Also explain lamella & effect of temperature on growth of sphermlite. [8] b) What are the different types of intermolecular bonding forces that contribute towards the attained intermolecular forces & thus properties.[8] OR Q12)Write short notes on any 3 : [16] a) Solubility parameter and its significance. b) Effect of halogens on properties. c) WLF equation. d) Why nylons are hygroscopic. kbkb [3764]-351 3

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