Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 17.14, Problem 7KCP
To determine
What are biopolymers.
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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
(a) Why most prosthetic limbs do not flex at the
ankle, but the ones designed for athletes do?
(b) Why is there almost no single test for
biocompatibility?
(c) Why is titanium such a commonly used
biomaterial?
(d) Why are most biomaterials not reused or
recycled?
What monomers and polymers and give some examples of each
Chapter 17 Solutions
Foundations of Materials Science and Engineering
Ch. 17.14 - Explain the difference between a biomaterial and...Ch. 17.14 - Explain why bone may be classified as a composite...Ch. 17.14 - Prob. 3KCPCh. 17.14 - Prob. 4KCPCh. 17.14 - Prob. 5KCPCh. 17.14 - What is stress shielding? How can it be avoided?Ch. 17.14 - Prob. 7KCPCh. 17.14 - What properties of biopolymers make them suitable...Ch. 17.14 - Prob. 9KCPCh. 17.14 - Prob. 10KCP
Ch. 17.14 - Prob. 11KCPCh. 17.14 - Prob. 12KCPCh. 17.14 - Prob. 13KCPCh. 17.14 - Prob. 14KCPCh. 17.14 - Prob. 15KCPCh. 17.14 - Prob. 16KCPCh. 17.14 - Prob. 17KCPCh. 17.14 - Prob. 18KCPCh. 17.14 - Prob. 19KCPCh. 17.14 - Prob. 20KCPCh. 17.14 - Prob. 21KCPCh. 17.14 - Prob. 22KCPCh. 17.14 - Prob. 23KCPCh. 17.14 - Prob. 24KCPCh. 17.14 - Prob. 25KCPCh. 17.14 - Prob. 26KCPCh. 17.14 - What is tissue engineering? What is the principle...Ch. 17.14 - Prob. 28KCPCh. 17.14 - Prob. 29KCPCh. 17.14 - Prob. 30AAPCh. 17.14 - Prob. 32AAPCh. 17.14 - Prob. 33AAPCh. 17.14 - Prob. 34AAPCh. 17.14 - Prob. 39SEPCh. 17.14 - Prob. 40SEPCh. 17.14 - Prob. 41SEPCh. 17.14 - Prob. 42SEPCh. 17.14 - Prob. 43SEPCh. 17.14 - Prob. 44SEPCh. 17.14 - A bone has fractured along an inclined plane as...Ch. 17.14 - Prob. 46SEPCh. 17.14 - Prob. 47SEPCh. 17.14 - Prob. 48SEPCh. 17.14 - Prob. 49SEPCh. 17.14 - What role does the water content play in the...Ch. 17.14 - Prob. 51SEPCh. 17.14 - Prob. 52SEPCh. 17.14 - When you wake up in the morning, you are taller...Ch. 17.14 - Prob. 54SEPCh. 17.14 - Prob. 55SEP
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- cis-1, 2-Dimethylcyclobutane is less stable than its trans isomer, but cis-1, 3-dimethylcyclobutane is more stable than its trans isomer.Draw the most stable conformations of both, and explain.arrow_forward( B ) A stress of 6.7 MPa is employed to one type of a polymer under constant strain . After 40 days at 20 ° C the stress is reduced to only 8.4 MPa . When the same polymer is heated to 40 ° C the relaxation time is 40 days . 1- Calculate the relaxation time constant for this material at 25 ° C ? 2- Estimate the stress after 50 days at 25 ° C ? 3- Estimate the stress relaxation activation energy for the same polymer .arrow_forwardWhich of the statements below are accurate regarding the stress-strain behavior of polymers: (This question has more than one correct answer) а. Strain softening happens in elastomers where the deformation gradually leads to a decrease in stress under constant strain rate b. As temperature is reduced, the necking behavior of plastic tensile bars completely disappears C- The slope of the stress-strain curve for totally elastic and brittle polymers is always positive d. The stress-strain curve for vulcanized elastomers has a greater slope than unvulcanized polymers throughoutarrow_forward
- Can you explain elastic hysteresis in polymers with the aid of a diagram?arrow_forwardThere are 4 classifications of structural molecular characteristics of polymers - Linear, Network, Crosslinked. What is the final type? Answer:arrow_forwardMolecular weight data for some polymer are tabulated here. Compute (a) the number-average molecular weight, (b) the weight-average molecular weight. (c) If it is known that this material's degree of polymerization is 710, which one of the polymers listed in Table 14.3 is this polymer? Why? Molecular Weight Range g/mol 15,000-30,000 Xi Wi 0.04 0.01 30,000-45,000 0.07 0.04 45,000-60,000 0.16 0.11 60,000-75,000 0.26 0.24 75,000-90,000 0.24 0.27 90,000 105,000 0.12 0.16 105,000-120,000 0.08 0.12 120,000-135,000 0.03 0.05arrow_forward
- What factors influence the crystallinity ofpolymers? Explain the development androle of crystallinity in PET and nylon.arrow_forwardWhich of these models would best give a description of viscoelastic behavior for polymers? Explain your answerarrow_forward[Materials Engineering] An endovascular stent graft is a fabric tube supported by a metal mesh. It is implanted inside the thoracic aorta to help reinforce the blood vessel. Identify two (2) biomaterials used each for the stent portion and the graft portion of endovascular stent graft.arrow_forward
- 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_forwardScanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) are powerful tools for imaging the micro- and nano-structure of a material. (a) Which technique provides higher imaging resolution, SEM or TEM? (b) Why does this technique provide higher resolution? Describe your reasoning. (c) A polymer sample is mounted on a solid metal stub and coated with a conductive layer. Which electron microscopy technique is the sample prepared for? (d) Why do we need a conductive coating on the polymer sample? Explain in terms of both the material and the imaging technique. (e) What information could Energy Dispersive X-ray (EDX) spectroscopy tell us about the sample? (f) Atomic Force Microscopy (AFM) enables high resolution surface imaging and measuring surface properties of samples. Describe one way that this (stiffness mapping) procedure can be done?arrow_forward
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