3 a) Sketch the graph of specific volume versus temperature for ideal crystalline, semi crystalline and amorphous polymers b) Label the phases and show Tm and Tg on the graph c) Consider the below graph of modulus versus temperature of polymers Which curve represents an ideal crystalline polymer, an amorphous polymer and a heavily crosslinked thermoset Explain your answer d) Polylactic acid, commonly known as PLA, is a popular material used in fused deposition modelling 3D printing During 3D printing, a heated build plate and a heated extruder are used In general, the best build plate temperature for PLA printing is around 60 oC, while the best extruder temperature is around 210 oC Explain why these temperatures are used in PLA printing (Hint check the glass transition temperature and melting temperature of PLA) 3 a) Sketch the graph of specific volume versus temperature for ideal crystalline, semi 3 crystalline and amorphous polymers b) Label the phases and show Tm and Tg on the graph c) Consider the below graph of modulus versus temperature of polymers Which curve 6 represents an ideal crystalline polymer, an amorphous polymer and a heavily crosslinked thermoset Explain your answer d) Polylactic acid, commonly known as PLA, is a popular material used in fused 2 deposition modelling 3D printing During 3D printing, a heated build plate and a heated extruder are used In general, the best build plate temperature for PLA printing is around 60C, while the best extruder temperature is around 210C Explain why these temperatures are used in PLA printing (Hint check the glass transition temperature and melting temperature of PLA)

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3. a) Sketch the graph of specific volume versus temperature for ideal crystalline, semi -crystalline and amorphous polymers b) Label the phases and show Tm

3. a) Sketch the graph of specific volume versus temperature for ideal crystalline, semi -crystalline and amorphous polymers b) Label the phases and show Tm and Tg on the graph. c) Consider the below graph of modulus versus temperature of polymers. Which curve represents an ideal crystalline polymer, an amorphous polymer and a heavily crosslinked thermoset? Explain your answer. d) Polylactic acid, commonly known as PLA, is a popular material used in fused deposition modelling 3D printing. During 3D printing, a heated build plate and a heated extruder are used. In general, the best build plate temperature for PLA printing is around 60 oC, while the best extruder temperature is around 210 oC. Explain why these temperatures are used in PLA printing? (Hint: check the glass transition temperature and melting temperature of PLA) image text in transcribed

3. a) Sketch the graph of specific volume versus temperature for ideal crystalline, semi- 3 crystalline and amorphous polymers. b) Label the phases and show Tm and Tg on the graph. c) Consider the below graph of modulus versus temperature of polymers. Which curve 6 represents an ideal crystalline polymer, an amorphous polymer and a heavily crosslinked thermoset? Explain your answer. d) Polylactic acid, commonly known as PLA, is a popular material used in fused 2 deposition modelling 3D printing. During 3D printing, a heated build plate and a heated extruder are used. In general, the best build plate temperature for PLA printing is around 60C, while the best extruder temperature is around 210C. Explain why these temperatures are used in PLA printing? (Hint: check the glass transition temperature and melting temperature of PLA)