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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. Conformation in which the largest substituents are offset by 180






2. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings






3. Molecule containing a highly reactive unpaired electron






4. 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






5. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...






6. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals






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






8. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel






9. 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






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






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






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






13. Number of bonds a molecule has formed






14. 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






15. Polymer made up of two of more differenet monomers covalently bonded together






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






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






18. Double bounded organic molecule used to begin addition polymerization






19. Broad category of polymers that includes polymers containing urethane linkages






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






21. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






22. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants






23. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end






24. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.






25. 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






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






27. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air






28. Formation of a polymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chain. this reaction also forms a byproduct - which is typically water






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






30. Atoms attached to the polymer backbone.






31. Polymer that is made up a single repeat unit






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






33. First step in the process of polymerization - during which a free radical is formed






34. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings






35. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed






36. Arrangement of the largest substituents where the substituets are offset by 120






37. Coloring agents that do not dissolve into the polymer






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






39. Two or more polymers mechanically mixed together but without covalent bonding between them






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






41. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color






42. Porcess of breaking large organic hydrocarbons into smaller molecules






43. Simple polymeric material produced as pellets in large quantities






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






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






46. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer






47. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion






48. 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






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






50. One type of polymer that contains at least 85% of polyacrylonitrile PAN