Q.1
What is the molecular distribution breadth for polymerization reaction of trifunctional monomers, if the conversion is 90%?
  • a) 0.344
  • b) 1.344
  • c) 0.33
  • d) none of the mentioned
Q.2
Hydroxyacid is allowed to polymerize in the presence of another trifunctional monomer containing carboxylic groups. What kind of structure is formed at the end of the reaction?
  • a) linear
  • b) branched
  • c) cross-linked
  • d) none of the mentioned
Q.3
Which of the following monomer molecule’s presence could lead to the formation of cross linking polymer, when hydroxyl caproic acid and carboxyl acid monomers (f>are polymerized together?
  • a) glycol
  • b) ethanol
  • c) diamines
  • d) none of the mentioned
Q.4
How does weight fraction distribution vary with increasing functionality at constant conversion?
  • a) gets broader
  • b) gets narrower
  • c) remains constant
  • d) none of the mentioned
Q.5
What is true about the branching system involving trifunctional monomers?
  • a) weight fraction of monomer lower than other species
  • b) weight fraction of bigger species become higher progressively
  • c) weight fraction of monomer always larger than other species
  • d) none of the mentioned
Q.6
How does the weight distribution vary with increasing conversion and constant trifunctionality?
  • a) gets broader
  • b) gets narrower
  • c) remains constant
  • d) none of the mentioned
Q.7
Atcompletion of reaction, only gel is present and the distribution breadth, Xw/Xn becomes infinite. State true or false.
  • a) True
  • b) False
Q.8
Which is the correct expression for number average degree of polymerization for the non-linear multi-functional systems?
  • a) 1/{1-(pf/2)}
  • b) (1+p)/{1-(f-1)p}
  • c) 1-(pf/2)
  • d) 1/(pf/2)
Q.9
Before the interaction of W3 and W4 curves in the given figure, the system consists of most weight abundant species. State true or false.
Questionpolymer-engineering-questions-answers9.jpg
  • a) true
  • b) false
Q.10
What is the weight average degree of polymerization for non-linear trifunctional system, if the conversion is 0.3?
  • a) 2.35
  • b) 3.25
  • c) 5.5
  • d) 1.82
0 h : 0 m : 1 s