Degarmo's Materials And Processes In Manufacturing
13th Edition
ISBN: 9781119492825
Author: Black, J. Temple, Kohser, Ronald A., Author.
Publisher: Wiley,
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Textbook Question
Chapter 8, Problem 15RQ
What does it mean when a polymer “crystallizes”? How is this different from the crystal structures observed in metals and ceramics?
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I1
An unknown polymer sample was found to have the following molecular weight distribution:
Molecular weight range
8,000 - 20,000
20,000 - 32,000
32,000 - 44,000
44,000 - 56,000
56,000 - 68,000
68,000 -80,000
80,000 - 92,000
0.03
Knowing that the monomer is methyl methacrylate, which of the below is the number average degree of polymerization for this polymer sample?
Select one:
O a.
O b. DP 476
O C.
DP = 338
DP = 664
O d. DP 544
O e. DP = 801
Xi
0.05
0.15
0.21
0.28
0.18
0.10
Wi
0.02
0.08
0.17
0.29
0.23
0.16
0.05
For a given polymer, the activation energy for stress relaxation was measured to be 10 kJ/mol. If the stress relaxation time for this polymer at room
temperature is 3,600 s, what would be the relaxation time at 100 ◦C?
Chapter 8 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 8 - Discuss the terms plastics and polymers. In...Ch. 8 - What are some naturally occurring nonmetallic...Ch. 8 - What are some material families that would be...Ch. 8 - How might plastics be defined from the viewpoints...Ch. 8 - What is the primary type of atomic bonding within...Ch. 8 - What is the difference between a saturated and an...Ch. 8 - What is an isomer?Ch. 8 - Describe and differentiate the two means of...Ch. 8 - What is a mer?Ch. 8 - What is degree of polymerization?
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- For a given polymer, the activation energy for the stress relaxation was measured to be 59kj/mol. If the stress relaxation time for this polymer at 7 degree Celsius is 3150 seconds. What is the relaxation time at 110 degree Celsiusarrow_forwardNowadays, many cooking utensils are made of polymeric materials. However, people believe that heating plastic utensils would cause harm such as releasing toxic substances. Hence, people are looking for other alternatives to replace plastic. Choose ONE cooking utensil (spatula) and identify the suitable material that will satisfy its criteria. Justify your answer. Your discussion must include the interrelationship between structure-properties-processing of the selected cooking utensil.arrow_forwardCan you explain elastic hysteresis in polymers with the aid of a diagram?arrow_forward
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