Thermoset polymers can be recycled with little to no degradation in properties. True or False
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Thermoset polymers can be recycled with little to no degradation in properties.
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- At room temperature, most polymers have similar fracture toughness compared to metals. O True FalseWhich 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 strengthEAC in metals causes cracks to form and grow. What other feature can form and grow in amorphous polymers suffering from EAC?
- 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 polymersIn general, polymers have lower strength, hardness, stiffness, density, and temperature resistance compared to ceramics. T or FPolymeric materials are liable to creep at room temperature, stress and time of loading, which one of the following statements is correct? a. the longer the time, the creep strain increase. b. The higher the temperature, the higher the creep limit. c. Reduce the stress increases the strain. d. Increase the temperature increases the creep strain.
- As crystallinity of polymers increases density decreases true or falseWhich 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 brittlenessWhich 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
- Draw stress-strain graphs for two polymers: one is stiffer than the other and exhibits ayield point and the other shows no clear yield point but is much tougher.STRESS STRAIN Typical for thermosets Typical for thermoplastics Q/Interpret the following drawingWhich statement is correct regarding the structure of polymers? O a. Degree of crystallinity and elongation at break have an inverse relationship O b. Strength increases at higher temperatures as the material softens O c. The tendency of a polymer to crystallize increases with increasing molecular weight Semi-crystalline polymers are heat treated to increase the crystallinity and improve polymer strength Amorphous & semi-crystalline polymers have lower strength than crystalline polymers Increasing the degree of crystallinity generally increases polymer strength, elastic modulus, and ductility in semi-crystalline polymers O g. It is desirable to have a ductile-to-brittle transition temperature below room temperature O d. Oe. O f.