HW-solution-Chapter 10

HW-solution-Chapter 10 - Chapter 10 Properties and...

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Chapter 10 Properties and Processing of Polymers and Reinforced Plastics; Rapid Prototyping Tooling 10.1 The mechanical and physical properties of plastics are: a) Thermoplastics are about two orders of magnitude less stiff than metals. Their ultimate tensile strength is about one order of magnitude lower than that of metals. b) Thermosets are not affected by temperature or rate of deformation and possess better mechanical, thermal, and chemical properties, electrical resistance, and dimensional stability than do thermoplastics. However, if the temperature is increased sufficiently, the thermosetting polymer begins to burn up, degrade and char. 10.2 Metal: high strength, heavy, require surface finish, can endure high temperature Plastic: low strength, low density, don’t require surface finish, will change state or shape in high temperature. 10.8 The mechanical and physical properties of polymers are greatly influenced by the degree of crystallinity increases, polymers become stiffer, harder, less ductile, more
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This note was uploaded on 10/27/2008 for the course MEM 437 taught by Professor Zhou during the Spring '08 term at Drexel.

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HW-solution-Chapter 10 - Chapter 10 Properties and...

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