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Polymer Engineering Multiple Choice Questions | MCQs | Quiz

Polymer Engineering Interview Questions and Answers
Pratice Polymer Engineering questions and answers for interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams.

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•   Classification
•   Characteristics
•   Growth Polymerization
•   Linear Polycondensation
•   Growth & Weight
•   Gel Points Prediction
•   Radical Chain
•   Condensation
•   Chain Kinetics
•   Initiation System
•   Thermal Initiation Effect
•   Photo Initiation
•   Chain Length
•   Chain Transfer
•   Inhibition & Retardation
•   Equilibrium Chain
•   Radical Kinetics
•   Absolute Rate Constant
•   Olefin Metathesis
•   Binary Copolymerization
•   Copolymerization Types
•   Radical Structure
•   Techniques - 1
•   Techniques - 2
•   Cationic Polymerization
•   Anionic Polymerization
•   Living Polymers
•   Polyethylene - 1
•   Polyethylene - 2
•   Polypropylene
•   Polystyrene
•   Acrylic Plastics & Fibres
•   Poly (vinyl Acetate)
•   Poly (vinyl Chloride)
•   Fluoropolymers
•   Polyamides
•   Cellulose Plastics
•   Phenolic Resins
•   Amino Resins
•   Other Plastic Materials
•   Plastics Additives
•   Natural Rubber
•   Synthetic Rubber - 1
•   Synthetic Rubber - 2
•   Plastics & Rubbers - 1
•   Plastics & Rubbers - 2

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Polymer Engineering Questions and Answers – Binary Copolymerization of Vinyl Monomers by Free Radical Mechanism

Posted on May 15, 2017 by Manish

This set of Polymer Engineering Quiz focuses on “Binary Copolymerization of Vinyl Monomers by Free Radical Mechanism”.

1. Which of the following mechanism can produce a copolymer?
a) step-growth mechanism
b) free radical mechanism
c) cationic mechanism
d) all of the mentioned
View Answer

Answer: d
Explanation: Copolymers can be produced by both step-growth mechanism and chain- growth mechanism, which can occur by free radical as well as ionic mechanisms.

2. How is the reactivity of a chain radical practically determined in a free radical copolymerization?
a) number of the monomers present
b) free radical bearing terminal monomer unit
c) size of the monomer unit
d) chemical nature of monomer unit
View Answer

Answer: b
Explanation: The reactivity of a chain radical in free radical polymerization is practically determined by the free radical bearing terminal monomer unit. The size and chemical nature of the part preceding the radical bearing terminal unit is of very little significance.

3. How many propagation reactions occur simultaneously in a binary copolymerization process?
a) 2
b) 4
c) 1
d) 3
View Answer

Answer: b
Explanation: In binary copolymerization, there are two different chain radicals which can add both the monomers, though not necessarily with same ease, the system characterizes four simultaneous propagation reactions.

4. What does the copolymer composition depend upon, in binary copolymerization?
a) feed monomer composition
b) initiator concentration
c) rate of polymerization
d) all of the mentioned
View Answer

Answer: a
Explanation: It is clear from the copolymer equation that copolymer composition is dependent on the feed monomer composition.
{[M1]/[M2]}copolymer = {[M1/[M2]}(r1[M1]+[M2])/(r2[M2]+[M1])
Also, there is absence of initiator and termination rate constants in the copolymer equation, which makes the composition independent of these terms.

5. Consider the copolymer equation of binary copolymerization between monomers M1 and M2
{[M1]/[M2]}copolymer = {[M1/[M2]}(r1[M1]+[M2])/(r2[M2]+[M1])
What does the term [M1] on the right hand signify here?
a) absolute molar concentration of monomer M1
b) molar concentration of monomer M1 in feed
c) molar concentration of monomer M1 in copolymer
d) none of the mentioned
View Answer

Answer: b
Explanation: The term [M1] on the right hand side is the molar concentration of monomer M1 in the feed or reaction mixture.

6. In most cases, the copolymer composition is not measurably affected due to the presence of solvents and additives. State true or false.
a) True
b) False
View Answer

Answer: a
Explanation: The composition is controlled by the kinetic factors, i.e. the reactivity ratios, r1 and r2, which are not affected by the initiator concentration, rate of polymerization and presence of solvents or additives. So the copolymer composition remains unaffected by such factors.

7. Which of the following has more priority, in binary copolymerization involving monomers M1 and M2, if the reactivity ratio r1 is greater than 1?
a) chain radical ∙M1 to add monomer M1
b) chain radical ∙M1 to add monomer M2
c) chain radical ∙M2 to add monomer M1
d) chain radical ∙M2 to add monomer M2
View Answer

Answer: a
Explanation: The reactivity ratio r1 is given by-
r1= k1,1/k1,2
i.e. the ratio of homo-propagation rate constant to cross propagation rate constant, involving the chain radical ∙M1. When r1 is greater than 1, it signifies that chain radical ∙M1 has a preference to add monomer M1.

8. The values of reactivity ratios, r1 and r2 are independent of the change in the mechanism of chain propagation, form radical to ionic mechanism. State true or false.
a) True
b) False
View Answer

Answer: b
Explanation: The values of reactivity ratios significantly change for a drastic change in the mechanism of chain propagation from free radical to ionic, and even from cationic to anionic mode of chain propagation.

9. How is the monomer units arranged generally, in the copolymer structure of any vinyl copolymer?
a) sequentially
b) alternatively
c) randomly
d) all of the mentioned
View Answer

Answer:c
Explanation:In general, the monomer units in a copolymer structure are arranged in a random manner.

10. Where is the copolymer equation of binary copolymerization not applicable?
a) free radical systems
b) cationic systems
c) anionic systems
d) none of the mentioned
View Answer

Answer: d
Explanation: The copolymer equation is relevant and applicable to radical, cationic and anionic systems, despite variations in values of reactivity ratios depending on the mode of chain propagation.

Sanfoundry Global Education & Learning Series – Polymer Engineering.
To practice all areas of Polymer Engineering for Quizzes, here is complete set of 1000+ Multiple Choice Questions and Answers.

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