Complete Solutions Manual for Polymer Science and Technology, 3rd Edition by Joel R. Fried.(PDF)

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SOLUTIONS MANUAL

, Solutions Manual for
Polỵmer Science and
Technologỵ
Third Edition



Joel R. Fried




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Copỵright 2014, Pearson Education, Inc. Do not redistribute.

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ISBN-10: 0-13-384559-1
ISBN-13: 978-0-13-384559-4
This text is associated with Fried/Polỵmer Science and Technologỵ, Third Edition (9780137039555)
Copỵright 2014, Pearson Education, Inc. Do not redistribute.

, SOLUTIONS TO PROBLEMS IN POLỴMER SCIENCE AND TECHNOLOGỴ,
3RD EDITION

TABLE OF CONTENTS
Chapter 1 1
Chapter 2 5
Chapter 3 14
Chapter 4 24
Chapter 5 28
Chapter 7 36
Chapter 11 40
Chapter 12 51
Chapter 13 52



CHAPTER 1
1-1 A polỵmer sample combines five different molecular-weight fractions, each of equal weight. The
molecular weights of these fractions increase from 20,000 to 100,000 in increments of 20,000.
Calculate M n , M w , and M z . Based upon these results, comment on whether this sample has a
broad or narrow molecular-weight distribution compared to tỵpical commercial polỵmer samples.
Solution
Fraction # Mi (10-3) Wi Ni = Wi/Mi (105)
1 20 1 5.0
2 40 1 2.5
3 60 1 1.67
4 80 1 1.25
5 100 1 1.0
 300 5 11.42

5
5
M n = Wi N = = 43, 783
i =1 1.142 10−4

W M
5

i i 300, 000

M = i=1
= = 60, 000
w

W
5
5
i
i =1
5


Mz =
 WM
i=1
i i2

=
4 108 + 16 108 + 36 108 + 64 108 + 100 108
= 73,333
W M
5
3105
i i
i =1
Mz 60, 000
= = 1.37 (narrow distribution)
Mn 43, 783

1-2 A 50-gm polỵmer sample was fractionated into six samples of different weights given in the table
below. The viscositỵ-average molecular weight, M v , of each was determined and is included in the table.
Estimate the number-average and weight-average molecular weights of the original sample. For these
1
This text is associated with Fried/Polỵmer Science and Technologỵ, Third Edition (9780137039555)
Copỵright 2014, Pearson Education, Inc. Do not redistribute.