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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Primary raw material for most polymers






2. Process of pushing polymers through a spinneret and winding the solidified fibers onto a tow - which imposes a shear stress on the fibers upstream as they emerge from the spinneret






3. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group






4. Is not asymetric and cannot have multiple configurations






5. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets






6. Atoms attached to the polymer backbone.






7. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA






8. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern






9. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance






10. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density






11. Double bounded organic molecule used to begin addition polymerization






12. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties






13. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber






14. Term used to represent the average molecular weight of a sample containing a wide range of polymer chain lengths. this term is used to avoid confusion between the number average and the weight molecular average weight






15. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain






16. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret






17. Carbon atom capable of multiple configurations due to four different substituents






18. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light






19. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability






20. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device






21. Covalent bonding of the polymer backbone and side groups






22. Formation of a plymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chains. this reaction also forms a biproduct - usually water






23. Polymer that is made up a single repeat unit






24. Low- molecular- weight building blocks repeated in the polymer chain






25. One of the two different types of termination in the polymerization process. during this type of termination - the free radicals from two different polymer chains join to end the propogation process






26. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties






27. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber






28. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination






29. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit






30. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.






31. Covalently bonded chains of molecules with small monomer units repeated from end to end






32. Additives whose primary purpose is to reduce the final cost of the product






33. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed






34. Number of repeat/structural units in a polymer chain






35. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit






36. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)






37. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains






38. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process






39. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






40. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group






41. Process used to make thermoset fibers by performing the polymerization reacting in a solbent as the material flows through a spinneret and into a quenching bath






42. Specific arrangements of atoms that cause organic compounds to behave in predictable ways






43. One method of expressing the molecular weight of sample of polymers with averaging based on weight; this method is more useful when large molecules in the sample dominate the behavior






44. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






45. Coloring agents that do not dissolve into the polymer






46. Porcess of breaking large organic hydrocarbons into smaller molecules






47. An acid and an alcohol






48. Number of bonds a molecule has formed






49. Configuration of a substituent in a polymer - in which the substituent is located on the same side of the polymer chain in all repeating units






50. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property