2:41 2) If the number-average degree of polymerization for styrene obtained by the bulk polymerization at 25°C is 5,000, what would be the number-average degree of polymerization if conducted in a 10% solution in toluene (900g of toluene per 100 g of styrene) under otherwise identical conditions? State any assumptions that are needed. (see Table 2-4). Table 2-4 Representative Values of Chain-Transfer Constants Monomer Styrene Chain-Transfer Agent T (°C) C x 104 Styrene 25 bas 0.279 * 50 0.35-0.78 Polystyrene 50 1.9-16.6 Benzoyl peroxide 50 0.13 Toluene 60 0.125 Methyl methacrylate Methyl methacrylate 30 0.117 70 0.2 Poly(methyl methacrylate) 50 0.22-1000 Benzoyl peroxide 50 0.01 Toluene 40 0.170 3) 2 3) Methyl methacrylate is copolymerized with 2-methylbenzyl methacrylate (M₁) in 1,4- dioxane at 60°C using AIBN as the free-radical initiator. (a) Draw the repeating unit of poly(2-methylbenzyl methacrylate). (b) From the data given in the table below, estimate the reactivity ratios of both monomers. 14 F₁* 0.10 0.14 0.25 0.33 0.50 0.52 0.75 0.70 0.90 0.87 From 1H-NMR measurements. c) Given the Q-e values for MMA (Q=0.78, e=0.40) and calculated r values, estimate the Q, e values for 2-methylbenzyl methacrylate from this data. d) Comment on the expected monomer sequence distribution in the resulting copolymer 4. a) Draw the steps for initiation and propagation for radical, anionic, cationic and coordination polymerization with styrene. b) Explain briefly chemically with chemical structures showing why styrene is better for anionic and cationic polymerization than ethylene. c) See the attached article regarding Nova Chemicals Sclairtech Technology. I) pls explain the advantages of using a dual reactor.ii) how are the polymer properties different with a bimodal MWD made using this approach? d) Briefly explain for recycling polyethylene how more uniform integration of short chain branches using a metallocene catalyst could facilitate better recycling vs. PE made using a traditional multi-site Ziegler-Natta catalyst.
2:41 2) If the number-average degree of polymerization for styrene obtained by the bulk polymerization at 25°C is 5,000, what would be the number-average degree of polymerization if conducted in a 10% solution in toluene (900g of toluene per 100 g of styrene) under otherwise identical conditions? State any assumptions that are needed. (see Table 2-4). Table 2-4 Representative Values of Chain-Transfer Constants Monomer Styrene Chain-Transfer Agent T (°C) C x 104 Styrene 25 bas 0.279 * 50 0.35-0.78 Polystyrene 50 1.9-16.6 Benzoyl peroxide 50 0.13 Toluene 60 0.125 Methyl methacrylate Methyl methacrylate 30 0.117 70 0.2 Poly(methyl methacrylate) 50 0.22-1000 Benzoyl peroxide 50 0.01 Toluene 40 0.170 3) 2 3) Methyl methacrylate is copolymerized with 2-methylbenzyl methacrylate (M₁) in 1,4- dioxane at 60°C using AIBN as the free-radical initiator. (a) Draw the repeating unit of poly(2-methylbenzyl methacrylate). (b) From the data given in the table below, estimate the reactivity ratios of both monomers. 14 F₁* 0.10 0.14 0.25 0.33 0.50 0.52 0.75 0.70 0.90 0.87 From 1H-NMR measurements. c) Given the Q-e values for MMA (Q=0.78, e=0.40) and calculated r values, estimate the Q, e values for 2-methylbenzyl methacrylate from this data. d) Comment on the expected monomer sequence distribution in the resulting copolymer 4. a) Draw the steps for initiation and propagation for radical, anionic, cationic and coordination polymerization with styrene. b) Explain briefly chemically with chemical structures showing why styrene is better for anionic and cationic polymerization than ethylene. c) See the attached article regarding Nova Chemicals Sclairtech Technology. I) pls explain the advantages of using a dual reactor.ii) how are the polymer properties different with a bimodal MWD made using this approach? d) Briefly explain for recycling polyethylene how more uniform integration of short chain branches using a metallocene catalyst could facilitate better recycling vs. PE made using a traditional multi-site Ziegler-Natta catalyst.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
Related questions
Question
Transcribed Image Text:2:41
2)
If the number-average degree of polymerization for styrene obtained by the bulk
polymerization at 25°C is 5,000, what would be the number-average degree of
polymerization if conducted in a 10% solution in toluene (900g of toluene per 100 g of
styrene) under otherwise identical conditions? State any assumptions that are needed. (see
Table 2-4).
Table 2-4 Representative Values of Chain-Transfer Constants
Monomer
Styrene
Chain-Transfer Agent
T (°C) C x 104
Styrene
25 bas 0.279
* 50
0.35-0.78
Polystyrene
50
1.9-16.6
Benzoyl peroxide
50
0.13
Toluene
60
0.125
Methyl methacrylate
Methyl methacrylate
30
0.117
70
0.2
Poly(methyl methacrylate)
50
0.22-1000
Benzoyl peroxide
50
0.01
Toluene
40
0.170
3)
2
3)
Methyl methacrylate is copolymerized with 2-methylbenzyl methacrylate (M₁) in 1,4-
dioxane at 60°C using AIBN as the free-radical initiator.
(a) Draw the repeating unit of poly(2-methylbenzyl methacrylate).
(b) From the data given in the table below, estimate the reactivity ratios of both monomers.
14
F₁*
0.10
0.14
0.25
0.33
0.50
0.52
0.75
0.70
0.90
0.87
From 1H-NMR measurements.
c) Given the Q-e values for MMA (Q=0.78, e=0.40) and calculated r values, estimate the
Q, e values for 2-methylbenzyl methacrylate from this data.
d) Comment on the expected monomer sequence distribution in the resulting copolymer
4.
a) Draw the steps for initiation and propagation for radical, anionic, cationic
and coordination polymerization with styrene.
b) Explain briefly chemically with chemical structures showing why styrene is
better for anionic and cationic polymerization than ethylene.
c) See the attached article regarding Nova Chemicals Sclairtech Technology. I)
pls explain the advantages of using a dual reactor.ii) how are the polymer
properties different with a bimodal MWD made using this approach?
d) Briefly explain for recycling polyethylene how more uniform integration of
short chain branches using a metallocene catalyst could facilitate better
recycling vs. PE made using a traditional multi-site Ziegler-Natta catalyst.
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