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 49RQ
What are some of the materials that can be added to natural rubber, and for what purpose?
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How does the degree of cross-linking affect the mechanical properties of a tough polymer?
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Drawing increases alignment and strength, and decreases ductility (% elongation)
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Annealing increases alignment, strength and elastic modulus
c.
Increasing temperature results in increased elastic modulus and strength, and decreased elongation
d.
Decreasing strain rate causes decreased strength and elastic modulus and increased elongation
e.
A higher degree of crosslinking generally results in decreased percent elongation at break, and increases strength
What is the purpose of a plasticizer, and what specific effect on room temperature behavior is likely when a plasticizer is added?
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?
Ch. 8 - How does increasing the chain length tend to...Ch. 8 - In what way are copolymers similar to alloys in...Ch. 8 - Describe and differentiate thermoplastic and...Ch. 8 - Describe the mechanism by which thermoplastic...Ch. 8 - What does it mean when a polymer crystallizes? How...Ch. 8 - What are some of the ways that a thermoplastic...Ch. 8 - What are the four most common thermoplastic...Ch. 8 - Why are thermosetting polymers characteristically...Ch. 8 - How do thermosetting polymers respond to...Ch. 8 - Describe how thermoplastic or thermosetting...Ch. 8 - What are some attractive engineering properties of...Ch. 8 - What are some limiting properties of plastics, and...Ch. 8 - What are some environmental conditions that might...Ch. 8 - What is the most common polymer (accounting for...Ch. 8 - What are some reasons that additive agents are...Ch. 8 - What are some functions of a filler material in a...Ch. 8 - What are some of the more common filler materials...Ch. 8 - What is the function of a plasticizer?Ch. 8 - What is the difference between a dye and a...Ch. 8 - What is the role of a stabilizer or antioxidant?Ch. 8 - How might electrical conductivity be imparted to a...Ch. 8 - What is an oriented plastic, and what is the...Ch. 8 - What are some properties and characteristics of...Ch. 8 - Describe the use of plastic materials as...Ch. 8 - What are some potential benefits of using plastics...Ch. 8 - Describe some of the applications for foamed...Ch. 8 - Provide some examples where plastics have competed...Ch. 8 - What are some features of plastics that make them...Ch. 8 - In a cost comparison, why might cost per unit...Ch. 8 - How has the use of plastics grown in the...Ch. 8 - What kinds of plastics are most easily recycled?Ch. 8 - Why is the recycling of mixed plastics more...Ch. 8 - What are some recycling alternatives for...Ch. 8 - What are some of the natural materials used to...Ch. 8 - What are some of the approaches to producing a...Ch. 8 - What is the unique mechanical property of...Ch. 8 - How can cross�linking be used to control the...Ch. 8 - What is the cause of stress relaxation in...Ch. 8 - What are some of the materials that can be added...Ch. 8 - What are some of the limitations of natural...Ch. 8 - What are some of the common artificial elastomers?Ch. 8 - Prob. 52RQCh. 8 - Prob. 53RQCh. 8 - Prob. 54RQCh. 8 - Prob. 55RQCh. 8 - Prob. 56RQCh. 8 - Prob. 57RQCh. 8 - Prob. 58RQCh. 8 - Prob. 59RQCh. 8 - What kinds of ceramic products are classified as...Ch. 8 - Prob. 61RQCh. 8 - Prob. 62RQCh. 8 - Prob. 63RQCh. 8 - What is the unique feature of piezoelectric...Ch. 8 - Prob. 65RQCh. 8 - Prob. 66RQCh. 8 - Prob. 67RQCh. 8 - What are cermets, and what properties or...Ch. 8 - What are some of the attractive features of a...Ch. 8 - Prob. 70RQCh. 8 - Prob. 71RQCh. 8 - Prob. 72RQCh. 8 - Prob. 73RQCh. 8 - Prob. 74RQCh. 8 - Prob. 75RQCh. 8 - Prob. 76RQCh. 8 - Prob. 77RQCh. 8 - What is a composite material?Ch. 8 - What are the basic features of a composite...Ch. 8 - Prob. 80RQCh. 8 - Prob. 81RQCh. 8 - Prob. 82RQCh. 8 - What are some reasons for creating clad...Ch. 8 - Prob. 84RQCh. 8 - Prob. 85RQCh. 8 - Prob. 86RQCh. 8 - Prob. 87RQCh. 8 - Prob. 88RQCh. 8 - Prob. 89RQCh. 8 - Prob. 90RQCh. 8 - Prob. 91RQCh. 8 - What is the most common matrix material used in...Ch. 8 - Prob. 93RQCh. 8 - What are the attractive features of a...Ch. 8 - Prob. 95RQCh. 8 - Prob. 96RQCh. 8 - Prob. 97RQCh. 8 - Prob. 98RQCh. 8 - Prob. 99RQCh. 8 - Prob. 100RQCh. 8 - Prob. 101RQCh. 8 - Prob. 102RQCh. 8 - What are some of the limitations that might...Ch. 8 - Prob. 104RQCh. 8 - Prob. 105RQCh. 8 - Prob. 1PCh. 8 - Many of the materials presented in this chapter...Ch. 8 - Prob. 4PCh. 8 - Prob. 5PCh. 8 - Prob. 6PCh. 8 - Prob. 7PCh. 8 - Locate a current or recent article describing an...Ch. 8 - The array of medical devices spans a wide range of...Ch. 8 - Use the Internet and other sources to research...Ch. 8 - Prob. 2CSCh. 8 - The US Army helmet has evolved from sheet steel,...Ch. 8 - Prob. 4CS
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- What polymer derived from acetylene gas is called polychloroprene (neoprene)?arrow_forwardWhy do thermoplastic polymers start to turn white as they are plastically deformed?arrow_forwardWhat happens to the stiffness of a polymer as the temperature Tg is exceeded? For what group of polymers is this change the greatest? The smallest?arrow_forward
- Polymer deterioration by swelling may be reduced by which of the following? Increasing degree of crosslinking, increasing molecular weight, and decreasing degree of crystallinity Decreasing degree of crosslinking, decreasing molecular weight, and decreasing degree of crystallinity Increasing degree of crosslinking, increasing molecular weight, and increasing degree of crystallinity Decreasing degree of crosslinking, increasing molecular weight, and increasing degree of crystallinityarrow_forwardWhat factors determine whether polymer behavior is predominantly elastic, viscoelastic, or viscoplastic?arrow_forwardWhich of the following are incorrect regarding the crystallinity and mechanical behavior of polymers? a. Strain softening happens in elastomers where the deformation gradually leads to a decrease in stiffness under constant strain rate b. As temperature is reduced, necking behavior of plastic tensile bars completely disappears C. The stress-strain curve slope for totally elastic and brittle polymers is always positive d. Heat treatment always results in enhanced polymer strength, modulus, and brittleness e. Semi-crystalline polymers are heat treated to increase crystallinity and improve strength f. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus, and ductility in semi-crystalline polymersarrow_forward
- Which of the following are incorrect regarding the crystallinity and mechanical behavior of polymers? a. As temperature is reduced, necking behavior of plastic tensile bars completely disappears b. Semi-crystalline polymers are heat treated to increase crystallinity and improve strength c. Heat treatment always results in enhanced polymer strength, modulus, and brittleness d. Strain softening happens in elastomers where the deformation gradually leads to a decrease in stiffness under constant strain rate e. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus, and ductility in semi-crystalline polymers f. The stress-strain curve slope for totally elastic and brittle polymers is always positivearrow_forwardwhich is correct? 0.20 , 0.80, 2.00, 0.25arrow_forwardThe σ - ε diagram for elastic fibers is shown. (Figure 1) Figure 385 σ(MPa) 77 < 1 of 1 €(mm/mm) 1 2 2.25arrow_forward
- Answer the following questions. i) Write down the important properties of polymers. ii) What do you mean by a highly elastic material and provide an example for that material. . iii) Which type of polymer is used to manufacture plastic pipes and explain the characteristics of that polymer. (Minimum 2 points) -arrow_forwardBriefly explain how each of the following influences the tensile or yield strength of a semicrystalline polymer and why: (a) Molecular weight (b) Degree of crystallinity (c) Deformation by drawingarrow_forwardBased on the graph below, reinforcing plastic with glass fibers results in: A. An increase in plasticity B. An increase in inelastic deformation C, An increase in stiffness D. A decrease in stiffnessarrow_forward
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