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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. Broad category of polymers that includes polymers containing urethane linkages






2. 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






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






4. Is not asymetric and cannot have multiple configurations






5. 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






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






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






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






9. 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






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






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






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






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






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






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






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






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






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






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






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






21. 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






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






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






24. Molecule containing a highly reactive unpaired electron






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






26. An acid and an alcohol






27. 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






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






29. 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






30. 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






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






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






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






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






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






36. 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






37. Polymer that is made up a single repeat unit






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






39. Coloring agents that do not dissolve into the polymer






40. Simple polymeric material produced as pellets in large quantities






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






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






43. 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






44. Porcess of breaking large organic hydrocarbons into smaller molecules






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






46. 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






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






48. Number of bonds a molecule has formed






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






50. Covalent bonding of the polymer backbone and side groups