You've been asked to select suitable candidate polymers for these applications: an ice tray with an operational temperature of -10C, a boat bumper with an operational temperature of -20C, a safety helmet, and a hairdryer with an operational temperature of 55C. Which of the below is a good choice of materials? O a. Low-density polyethylene, nylon, polypropylene, and high-density polyethylene O b. High-density polyethylene, low-density polyethylene, polypropylene, and polypropylene O c. High-density polyethylene, polypropylene, polytetrafluoroethylene, and high-density polyethylene O d. polypropylene, low-density polyethylene, poly(vinyl chloride), and polypropylene Oe. Low-density polyethylene, low-density polyethylene, polytetrafluoroethylene, and high-density polyethylene

You've been asked to select suitable candidate polymers for these applications: an ice tray with an operational temperature of -10C, a boat bumper with an operational temperature of -20C, a safety helmet, and a hairdryer with an operational temperature of 55C. Which of the below is a good choice of materials? O a. Low-density polyethylene, nylon, polypropylene, and high-density polyethylene O b. High-density polyethylene, low-density polyethylene, polypropylene, and polypropylene O c. High-density polyethylene, polypropylene, polytetrafluoroethylene, and high-density polyethylene O d. polypropylene, low-density polyethylene, poly(vinyl chloride), and polypropylene Oe. Low-density polyethylene, low-density polyethylene, polytetrafluoroethylene, and high-density polyethylene

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Connecting rod (as shown below) is a car part that connects engine piston to crankshaft and converts reciprocating motion into rotating motion. It performs under load at high temperature around 150°C. Long carbon fiber thermoplastic composite (LFT) with 30% carbon fiber has been considered to replace metal (steel or aluminum) rod to improve efficiency. Based on the data for different polymers listed in the table above, which polymer(s) would you choose as the polymer matrix for the connecting rod? What is your rationale?
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Which 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 polymers
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