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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. Smallest repeating unit in a polymer. aka repeat unit






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






3. Primary raw material for most polymers






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






5. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads






6. 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






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






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






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






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






11. 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






12. 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






13. An acid and an alcohol






14. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






17. Relative configuration of adjecent asymmetric carbons






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






19. 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






20. 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






21. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly






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






23. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared






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






25. Covalent bonding of the polymer backbone and side groups






26. 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






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






28. Polymers that contain amide (- N-) groups in the chain






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






30. Double bounded organic molecule used to begin addition polymerization






31. Molecule containing a highly reactive unpaired electron






32. Part of the polymer processing apparatus through which the polymer is pushed - causing the polymer to form a simple shape - such as a rod or tube






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






34. 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






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






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






37. Atoms attached to the polymer backbone.






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






39. Polymer that is made up a single repeat unit






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






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






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






43. Conformation in which the largest substituents are offset by 180






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






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






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






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






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






49. Simple polymeric material produced as pellets in large quantities






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