5.(a) A polymer sample was analysed by differential scanning calorimetryand the thermogram shown in the figure below was obtained.Highlight and describe the key thermal transitions occurring in thissample.^2EXOTHERMIC(b) From the reactivity ratio data for the free-radical copolymerisationsshown below, state what class of polymer is produced from thesereactions and justify your answer.Reaction Monomer 11StyreneStyreneMethylMethacrylateEthylene350Temperature4Monomer 2MethylMethacrylateVinylacetateVinylchlorideVinylacetateTemp./°C r₁ 126060100681300.52 0.4655 0.0110 0.10.97 1.02

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A polymer sample was analysed by differential scanning calorimetry and the thermogram shown in the figure below was obtained. Highlight and describe the key thermal transitions occurring in this sample.

A polymer sample was analysed by differential scanning calorimetry and the thermogram shown in the figure below was obtained. Highlight and describe the key thermal transitions occurring in this sample.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

5.
(a) A polymer sample was analysed by differential scanning calorimetry
and the thermogram shown in the figure below was obtained.
Highlight and describe the key thermal transitions occurring in this
sample.
^
2
EXOTHERMIC
(b) From the reactivity ratio data for the free-radical copolymerisations
shown below, state what class of polymer is produced from these
reactions and justify your answer.
Reaction Monomer 1
1
Styrene
Styrene
Methyl
Methacrylate
Ethylene
3
50
Temperature
4
Monomer 2
Methyl
Methacrylate
Vinyl
acetate
Vinyl
chloride
Vinyl
acetate
Temp./°C r₁ 12
60
60
100
68
130
0.52 0.46
55 0.01
10 0.1
0.97 1.02

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