What is the difference between thermoplastics and thermosets?Select one:O a. There is no significant difference.O b. Thermosets are cross-linked, thermoplastics are linear polymers.O c. Thermoplastics are more elastic then thermosets.O d. Thermoplastics cannot be melted, while thermosets can be.

Answered: What is the difference between…

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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STRESS STRAIN Typical for thermosets Typical for thermoplastics Q/Interpret the following drawing
1 Which one below is true for thermoplastic polymers? * O They do not soften when heated and do not harden when cooled. O Most cross-linked polymers are thermoplastics. O None of them. O They are harder and stronger than thermosetting polymers.
Which statements are correct regarding the mechanical properties of polymers? a. Drawing increases alignment and strength, and decreases ductility (% elongation) b. 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
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 positive
State the critical difference in the processing behavior of thermoplastics vs. thermosets.
Choose the characteristic of thermoset polymer I. High rigidity II. Not sensitive to UV light II. Cannot be re-melted and re-form IV. High electrical insulating property A. I, Il and III II, III and IV I, III and IV C. D. I, II, III and IV B.
When a polymer takes on a crystalline structure, its density, stiffness, and melting temperature decrease. T or F
What is the difference between thermoplastics and thermosets? A)Thermosets are cross-linked, thermoplastics are linear polymers. B)There is no significant difference. C)Thermoplastics cannot be melted, while thermosets can be. D)Thermoplastics are more elastic then thermosets.
Which of the following is incorrect regarding the degree of crystallinity of semi-crystalline polymers? (This question has more than one correct answer) a. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus and ductility in semi-crystalline polymers b. Semi-crystalline polymers are heat treated to increase the crystallinity and improve polymer strength c. The tendency of a polymer to crystalize decreases with increasing molecular weight d. Heat treatment always results in enhanced polymer strength, elastic modulus and brittleness
Question 6. Calculate the average molecular weight Mm for a thermoplastic that has the following weight fractions fi for the molecular weight ranges listed: Molecular Weight _fi 0.01 Molecular Weight Range (g/mol) 20,000-25,000 25,000-30,000 30,000-35,000 35,000-40,000 Range (g/mol) fi 0-5000 0.19 5000-10,000 0.04 0.21 0.15 10,000-15,000 15,000-20,000 0.16 0.17 0.07
Make introduction First paragraph: Generally, explain thermoplastic fundamental and their demand in industry. Second paragraph: Highlight the recent demand for conductive thermoplastic. Third paragraph: Highlight the current approach to make conductive thermoplastic.
Compared to thermoplastics, thermosets are more rigid, brittle, capable of higher service temperatures, and cannot be remelted. Question 25 options: True False

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