Polymer Science and Engineering exam (WPE 101) from the 2018 Level-1 Term-I finals, BUTEX affiliated colleges. Questions include end group and inhibitor definitions, number average molecular weight proofs, cationic mechanisms, DP-reaction extent relations, and biopolymers.
Level-1 Term-I, Final Exám-2018
Subject: Polymer Science and Engineering (Code: WPE 101)
Time: 3.0 Hrs. Full Marks: 72
(Use separate answer script for Part: A and Part: B)
(All parts of a question must be answered consecutively)
Part: A
(Answer any three questions)
1. (a) Define the terms (i) End group (ii) Repeating unit (iii) Inhibitor and (iv) Polymerization.
(b) Classification of polymer on the basis of chemical nature with example.
(c) Write the importance of polymer in textile field.
(d) Write the D.P value of following fibres: Cotton and Nylon 6.6.
[4+3+4+1=12]
2. (a) What are meant by term monodispersity and index of polydispersity.
(b) Prove that number average molecular weight, M̄n = Σnimi / Σni
(c) Write the name of different methods determination of M̄n.
(d) Find out M̄n, M̄w and index of polydispersity when these are four entities having molecular weight of 10, 20, 100 and 250 respectively. Also consider the number of each entities are 2, 4, 6 and 3 respectively.
[3+3+2+4=12]