Test your basic knowledge |

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. 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






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






3. Softening agents






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






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






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






7. Covalent bonding of the polymer backbone and side groups






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






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






10. 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






11. 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






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






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






14. 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






15. 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






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






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






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






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






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






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






22. Conformation that occurs when the largest substituent in a molecule are offset by 60






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






24. Molecule containing a highly reactive unpaired electron






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






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






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






28. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






31. An acid and an alcohol






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






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






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






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






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






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






38. Double bounded organic molecule used to begin addition polymerization






39. Primary raw material for most polymers






40. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow






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






42. Smallest repeating unit in a polymer. aka repeat unit






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






44. Pigments or dyes that change the way light is absorbed or reflected by a polymer






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






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






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






48. 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






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






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