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






2. 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






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






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






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






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






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






8. Atoms attached to the polymer backbone.






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






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






11. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings






12. Primary raw material for most polymers






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






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






15. Relative configuration of adjecent asymmetric carbons






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






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






18. Coloring agents that do not dissolve into the polymer






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






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






21. Double bounded organic molecule used to begin addition polymerization






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






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






24. 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






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






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






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






28. An acid and an alcohol






29. Covalent bonding of the polymer backbone and side groups






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






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






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






33. 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






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






35. 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






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






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






38. Number of bonds a molecule has formed






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






40. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






44. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






45. Polymer that is made up a single repeat unit






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






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. 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






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






50. 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