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






2. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret






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






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






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






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






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






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






9. 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






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






11. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants






12. Is not asymetric and cannot have multiple configurations






13. An acid and an alcohol






14. Simple polymeric material produced as pellets in large quantities






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






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






17. 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






18. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






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






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






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






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






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






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






25. 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






26. Number of bonds a molecule has formed






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






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






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






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






31. 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






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






33. Polymer that is made up a single repeat unit






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






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






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






37. 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






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






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






40. Softening agents






41. 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






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






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






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






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






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






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






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






49. Double bounded organic molecule used to begin addition polymerization






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