What is the effect of polymer transfer on the polymer product formed by radical polymerization?

becomes less resistant to foreign agents

What does the effect of chain transfer on Rp depend on?

re-initiation rate constant, ki’

WHAT_IS_THE_EFFECT_OF_POLYMER_TRANSFER_ON_THE_POLYMER_PRODUCT_FORMED_BY_RADICAL_POLYMERIZATION??$

becomes less resistant to foreign agents

What is the value of intercept, when (1/Xn) is plotted against Rp, if only monomer transfer has a significant occurence?

[I]¬¨¬®‚Äö√Ñ‚Ä†

What is the value of chain transfer constant for a transfer agent?

rate constant for chain transfer reaction, ktr

How is the value of average degree of polymerization defined, considering the chain transfer mechanism?

ratio of total rate of production of chain ends to overall rate of polymerization

ratio of overall rate of polymerization to total rate of production of pairs of chain ends

ratio of total rate of production of chain ends to overall rate of polymerization

ratio of overall rate of polymerization to rate of formation of pairs of chain ends by chain transfer

ratio of rate of formation of pairs of chain ends by chain transfer to overall rate of polymerization

What does the effect of chain transfer on Rp depend on?

re-initiation rate constant, ki‚Äö√Ñ√∂‚àö√ë‚àö¬•

ki‚Äö√Ñ√∂‚àö√ë‚àö¬•/kp

22 + Mcqs in Chain Transfer in Polymer Engineering Page 1 McqOptions

1.	The molecular weight of the polymer, when styrene is polymerized at 60ᵒC, is halved by diluting it with ethyl benzene. What is the value of transfer constant to the solvent, if the dilution factor is 7 and the term 1/Xn0 is 4.8*10-4?
A.	0.335
B.	0.68
C.	1.5
D.	0.82
Answer» C. 1.5

Discussion

2.	The transfer constant to the solvent for polymerization of of styrene in toluene at 60ᵒC is 0.12510-5. How much dilution is required to decrease the molecular weight by 4 times when 1/Xn0 is 3.510-4?
A.	75
B.	42
C.	84
D.	7
Answer» D. 7

Discussion

3.	Consider the expression for reciprocal of average degree of polymerization, when styrene is polymerized with t-butyl hydroperoxide at 60ᵒC-1/Xn = 0.610-4+10.0Rp+1.73104 Rp2Calculate the value of initiator transfer constant, if the monomer concentration is 8.35 mol/l and the value of the term kp2 fkd/kt= 3.29*10-9.
A.	0.035
B.	0.07
C.	0.063
D.	0.0175
Answer» B. 0.07

Discussion

4.	For polymerization of vinyl acetate with hydrogen peroxide at 60ᵒC, the reciprocal of number average degree of polymerization is given by,1/Xn = 1.7510-4 + 14.0Rp + 5.4104Rp2What is the value of monomer transfer constant?
A.	1.75*10-4
B.	0.875*10-4
C.	5.4*104
D.	14
Answer» B. 0.875*10-4

Discussion

5.	What is the effect of polymer transfer on the polymer product formed by radical polymerization?
A.	becomes less crystallizable
B.	becomes mechanically weak
C.	becomes less resistant to foreign agents
D.	all of the mentioned
Answer» E.

Discussion

6.	How does the value of solvent transfer constant, CS vary in the solvents with increasing substitution at the α-carbon?
A.	increases
B.	decreases
C.	constant
D.	none of the mentioned
Answer» B. decreases

Discussion

7.	What is the value of intercept and slope of the straight line, when the term [1/Xn– [(y+2)/(y+1)](kt/kp2)(Rp/[M]2)] is plotted against the ratio [I]/[M], when both monomer and initiator transfer are considered?
A.	CM, CI
B.	CI, CM
C.	0, CI
D.	none of the mentioned
Answer» B. CI, CM

Discussion

8.	What is the value of intercept, when (1/Xn) is plotted against Rp, if only monomer transfer has a significant occurence?
A.	0
B.	CM
C.	CI
D.	[I]
Answer» C. CI

Discussion

9.	What does the effect of chain transfer on Rp depend on?
A.	re-initiation rate constant, ki’
B.	monomer concentration
C.	ki’/kp
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

10.	WHAT_IS_THE_EFFECT_OF_POLYMER_TRANSFER_ON_THE_POLYMER_PRODUCT_FORMED_BY_RADICAL_POLYMERIZATION??$
A.	becomes less crystallizable
B.	becomes mechanically weak
C.	becomes less resistant to foreign agents
D.	all of the mentioned
Answer» E.

Discussion

11.	Consider the expression for reciprocal of average degree of polymerization, when styrene is polymerized with t-butyl hydroperoxide at 60¬¨‚àë¬¨¬µ‚àö‚â†C-$#
A.
B.
Answer» B.

Discussion

12.	For_polymerization_of_vinyl_acetate_with_hydrogen_peroxide_at_60¬¨‚àë¬¨¬µ‚àö‚â†C,_the_reciprocal_of_number_average_degree_of_polymerization_is_given_by,$#
A.
B.
Answer» B.

Discussion

13.	The molecular weight of the polymer, when styrene is polymerized at 60¬¨‚àë¬¨¬µ‚àö‚â†C, is halved by diluting it with ethyl benzene. What is the value of transfer constant to the solvent, if the dilution factor is 7 and the term 1/X_n0 is 4.8*10^-4?$
A.	0.335
B.	0.68
C.	1.5
D.	0.82
Answer» C. 1.5

Discussion

14.	The_transfer_constant_to_the_solvent_for_polymerization_of_of_styrene_in_toluene_at_60¬¨‚àë¬¨¬µ‚àö‚â†C_is_0.12510^-5._How_much_dilution_is_required_to_decrease_the_molecular_weight_by_4_times_when_1/X_n0_is_3.510^-4?$
A.	75
B.	42
C.	84
D.	7
Answer» D. 7

Discussion

15.	What is the slope of the linear plot of log [S] v/s log [M] in significant solvent transfer mechanism?
A.	C<sub>M</sub>
B.	C<sub>S</sub>
C.	k<sub>tr</sub>,S
D.	C<sub>I</sub>
Answer» C. k<sub>tr</sub>,S

Discussion

16.	Which of the following solvents is not useful for controlling the degree of polymerization?
A.	carbon tetra-bromide
B.	pentaphenyl ethane
C.	t-butyl mercaptan
D.	toluene
Answer» E.

Discussion

17.	How does the value of solvent transfer constant, C_S vary in the solvents with increasing substitution at the ‚âà√≠¬¨¬±-carbon?$
A.	increases
B.	decreases
C.	constant
D.	none of the mentioned
Answer» B. decreases

Discussion

18.	What is the value of intercept and slope of the straight line, when the term [1/X_n‚Äö√Ñ√∂‚àö√ë‚àö¬® [(y+2)/(y+1)](k_t/k_p²)(R_p/[M]²)] is plotted against the ratio [I]/[M], when both monomer and initiator transfer are considered?$
A.	C<sub>M</sub>, C<sub>I</sub>
B.	C<sub>I</sub>, C<sub>M</sub>
C.	0, C<sub>I</sub>
D.	none of the mentioned
Answer» B. C<sub>I</sub>, C<sub>M</sub>

Discussion

19.	What is the value of intercept, when (1/X_n) is plotted against R_p, if only monomer transfer has a significant occurence?
A.	0
B.	C<sub>M</sub>
C.	C<sub>I</sub>
D.	[I]¬¨¬®‚Äö√Ñ‚Ä†
Answer» C. C<sub>I</sub>

Discussion

20.	What is the value of chain transfer constant for a transfer agent?
A.	rate constant for chain transfer reaction, k<sub>tr</sub>
B.	product of k<sub>tr</sub> and k<sub>p</sub>
C.	ratio of k<sub>tr</sub> to k<sub>p</sub>
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

21.	How is the value of average degree of polymerization defined, considering the chain transfer mechanism?
A.	ratio of overall rate of polymerization to total rate of production of pairs of chain ends
B.	ratio of total rate of production of chain ends to overall rate of polymerization
C.	ratio of overall rate of polymerization to rate of formation of pairs of chain ends by chain transfer
D.	ratio of rate of formation of pairs of chain ends by chain transfer to overall rate of polymerization
Answer» B. ratio of total rate of production of chain ends to overall rate of polymerization

Discussion

22.	What does the effect of chain transfer on R_p depend on?
A.	re-initiation rate constant, k<sub>i</sub><sup>‚Äö√Ñ√∂‚àö√ë‚àö¬•</sup>
B.	monomer concentration
C.	k<sub>i</sub><sup>‚Äö√Ñ√∂‚àö√ë‚àö¬•</sup>/k<sub>p</sub>
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

Explore topic-wise MCQs in Polymer Engineering.

The molecular weight of the polymer, when styrene is polymerized at 60ᵒC, is halved by diluting it with ethyl benzene. What is the value of transfer constant to the solvent, if the dilution factor is 7 and the term 1/Xn0 is 4.8*10-4?

The transfer constant to the solvent for polymerization of of styrene in toluene at 60ᵒC is 0.125*10-5. How much dilution is required to decrease the molecular weight by 4 times when 1/Xn0 is 3.5*10-4?

For polymerization of vinyl acetate with hydrogen peroxide at 60ᵒC, the reciprocal of number average degree of polymerization is given by,1/Xn = 1.75*10-4 + 14.0Rp + 5.4*104Rp2What is the value of monomer transfer constant?

What is the effect of polymer transfer on the polymer product formed by radical polymerization?

How does the value of solvent transfer constant, CS vary in the solvents with increasing substitution at the α-carbon?

What is the value of intercept and slope of the straight line, when the term [1/Xn– [(y+2)/(y+1)](kt/kp2)(Rp/[M]2)] is plotted against the ratio [I]/[M], when both monomer and initiator transfer are considered?

What is the value of intercept, when (1/Xn) is plotted against Rp, if only monomer transfer has a significant occurence?

What does the effect of chain transfer on Rp depend on?

WHAT_IS_THE_EFFECT_OF_POLYMER_TRANSFER_ON_THE_POLYMER_PRODUCT_FORMED_BY_RADICAL_POLYMERIZATION??$

Consider the expression for reciprocal of average degree of polymerization, when styrene is polymerized with t-butyl hydroperoxide at 60¬¨‚àë¬¨¬µ‚àö‚â†C-$#

For_polymerization_of_vinyl_acetate_with_hydrogen_peroxide_at_60¬¨‚àë¬¨¬µ‚àö‚â†C,_the_reciprocal_of_number_average_degree_of_polymerization_is_given_by,$#

The molecular weight of the polymer, when styrene is polymerized at 60¬¨‚àë¬¨¬µ‚àö‚â†C, is halved by diluting it with ethyl benzene. What is the value of transfer constant to the solvent, if the dilution factor is 7 and the term 1/Xn0 is 4.8*10-4?$

The_transfer_constant_to_the_solvent_for_polymerization_of_of_styrene_in_toluene_at_60¬¨‚àë¬¨¬µ‚àö‚â†C_is_0.125*10-5._How_much_dilution_is_required_to_decrease_the_molecular_weight_by_4_times_when_1/Xn0_is_3.5*10-4?$

What is the slope of the linear plot of log [S] v/s log [M] in significant solvent transfer mechanism?

Which of the following solvents is not useful for controlling the degree of polymerization?

How does the value of solvent transfer constant, CS vary in the solvents with increasing substitution at the ‚âà√≠¬¨¬±-carbon?$

What is the value of intercept and slope of the straight line, when the term [1/Xn‚Äö√Ñ√∂‚àö√ë‚àö¬® [(y+2)/(y+1)](kt/kp2)(Rp/[M]2)] is plotted against the ratio [I]/[M], when both monomer and initiator transfer are considered?$

What is the value of intercept, when (1/Xn) is plotted against Rp, if only monomer transfer has a significant occurence?

What is the value of chain transfer constant for a transfer agent?

How is the value of average degree of polymerization defined, considering the chain transfer mechanism?

What does the effect of chain transfer on Rp depend on?

The transfer constant to the solvent for polymerization of of styrene in toluene at 60ᵒC is 0.12510-5. How much dilution is required to decrease the molecular weight by 4 times when 1/Xn0 is 3.510-4?

For polymerization of vinyl acetate with hydrogen peroxide at 60ᵒC, the reciprocal of number average degree of polymerization is given by,1/Xn = 1.7510-4 + 14.0Rp + 5.4104Rp2What is the value of monomer transfer constant?

The molecular weight of the polymer, when styrene is polymerized at 60¬¨‚àë¬¨¬µ‚àö‚â†C, is halved by diluting it with ethyl benzene. What is the value of transfer constant to the solvent, if the dilution factor is 7 and the term 1/X_n0 is 4.8*10^-4?$

The_transfer_constant_to_the_solvent_for_polymerization_of_of_styrene_in_toluene_at_60¬¨‚àë¬¨¬µ‚àö‚â†C_is_0.12510^-5._How_much_dilution_is_required_to_decrease_the_molecular_weight_by_4_times_when_1/X_n0_is_3.510^-4?$

How does the value of solvent transfer constant, C_S vary in the solvents with increasing substitution at the ‚âà√≠¬¨¬±-carbon?$

What is the value of intercept and slope of the straight line, when the term [1/X_n‚Äö√Ñ√∂‚àö√ë‚àö¬® [(y+2)/(y+1)](k_t/k_p²)(R_p/[M]²)] is plotted against the ratio [I]/[M], when both monomer and initiator transfer are considered?$

What is the value of intercept, when (1/X_n) is plotted against R_p, if only monomer transfer has a significant occurence?

What does the effect of chain transfer on R_p depend on?