a. Is polytetrafluoroethylene (PTFE) a thermoset or thermoplastic? Explain your answer. b. Table Q4b lists molecular weight data for the polymer polytetrafluoroethylene (PTFE) in addition to the atomic weights for

a selection of atoms. Using the data in the table,calculate the following: c. Explain the effects of the glass transition and melting temperatures on the density of amorphous, semi crystalline and crystalline polymers. d. An E-glass fibre/epoxy composite has a longitudinal composite elastic modulus of46 GPa. The properties of the E-glass fibre and epoxy are shown in Table Q4d. You can assume that the E-glass fibres are continuous and unidirectional,therefore the following equations can apply: \sigma_{c l}=\sigma_{m} V_{m}+\sigma_{f} V_{f} E_{c l}=E_{m} V_{m}+E_{f} V_{f} Where o is the yield strength, V is the volume fraction and E is the elasticmodulus. The subscript 'f' denotes fibre, 'm' is matrix, 'c' is composite and I' is longitudinal. i.What are the volume fractions of E-glass fibre and epoxy phases? ii.What is the composite tensile strength?!! The volume fractions were changed to increase the longitudinal composite modulus by 10 % from 46 GPa to 50.6 GPa. What is the percentage increase in longitudinal composite Yield strength?