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






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






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






4. Softening agents






5. 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






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






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






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






9. Molecule containing a highly reactive unpaired electron






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






11. Porcess of breaking large organic hydrocarbons into smaller molecules






12. 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






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






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






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






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






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






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






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






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






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






23. Is not asymetric and cannot have multiple configurations






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






25. 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






26. 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






27. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber






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






29. 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






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






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






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






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






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






35. Atoms attached to the polymer backbone.






36. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






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






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






44. Covalent bonding of the polymer backbone and side groups






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






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






47. 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






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






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






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