The following data were obtained from tensile test: Which of the three experiments (A,B, or C) was studying a semi-crystalline polymer above Tg? Question 7Select one or more: a. A b. B c. C

Discuss the relationship between the following variables in the context of polymeric material.(9 marks)i. Chain length and viscosityii. Crystallinity and tensile strengthiii. Chain structure and density

Which of the following will increase the strain to failure of polymers?  a. cross-linking of the molecules b. Increased molecular length  c. Addition of a plasticizer  d. Increase degree of crystallization

shows results for a series of tensile tests on a specific type of polymer. Thesetests were done under varying test conditions which is represented with the “Arrow A”.Suggest how “arrow A” could be labelled. Furthermore, explain why this change in testconditions produced this change in stress-strain curve.

Choose the correct statements.(a)    Polymers behave as elastic body at low temperatures and high rates of strain(b)    At high temperatures and low rates of strain polymers behave in a viscous manner, flowing like a liquid(c)    At low temperatures and high rates of strain polymers behave in a viscous manner, flowing like a liquid(d)   Polymers behave as elastic body at high temperatures and low strain ratesQuestion 4Select one or more:a.(a)b.(c)c.(b)d.(d)

hat is the glass transistional temperature (Tg) in the context of polymeric materials?What effect does crystallinity have on Tg ? Draw a stress/strain graph and draw twocurves; one for a plastic below its Tg and one for when it is above Tg.