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Which of the following are incorrect regarding the crystallinity and mechanical behavior of polymers? a. Semi-crystalline polymers are heat treated to increase crystallinity and improve strength O b. Strain softening happens in elastomers where the deformation gradually leads to a decrease in stiffness under constant strain rate O c. Heat treatment always results in enhanced polymer strength, modulus, and brittleness The stress-strain curve slope for totally elastic and brittle polymers is always positive d. e. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus, and ductility in semi-crystalline polymers O f. As temperature is reduced, necking behavior of plastic tensile bars completely disappears

Which of the following are incorrect regarding the crystallinity and mechanical behavior of polymers? a. Semi-crystalline polymers are heat treated to increase crystallinity and improve strength O b. Strain softening happens in elastomers where the deformation gradually leads to a decrease in stiffness under constant strain rate O c. Heat treatment always results in enhanced polymer strength, modulus, and brittleness The stress-strain curve slope for totally elastic and brittle polymers is always positive d. e. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus, and ductility in semi-crystalline polymers O f. As temperature is reduced, necking behavior of plastic tensile bars completely disappears

Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter23: Organic Polymers, Natural And Synthetic
Section: Chapter Questions
Problem 51QAP
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Which of the following are incorrect regarding the crystallinity and mechanical behavior of polymers? a. Semi-crystalline polymers are heat treated to increase crystallinity and improve strength b. Strain softening happens in elastomers where the deformation gradually leads to a decrease in stiffness under constant strain rate O c. Heat treatment always results in enhanced polymer strength, modulus, and brittleness O d. The stress-strain curve slope for totally elastic and brittle polymers is always positive ○ e. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus, and ductility in semi-crystalline polymers O f. As temperature is reduced, necking behavior of plastic tensile bars completely disappears
Transcribed Image Text:Which of the following are incorrect regarding the crystallinity and mechanical behavior of polymers? a. Semi-crystalline polymers are heat treated to increase crystallinity and improve strength b. Strain softening happens in elastomers where the deformation gradually leads to a decrease in stiffness under constant strain rate O c. Heat treatment always results in enhanced polymer strength, modulus, and brittleness O d. The stress-strain curve slope for totally elastic and brittle polymers is always positive ○ e. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus, and ductility in semi-crystalline polymers O f. As temperature is reduced, necking behavior of plastic tensile bars completely disappears
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