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






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






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






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






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






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






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






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






9. Molecule containing a highly reactive unpaired electron






10. Number of bonds a molecule has formed






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






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






13. An acid and an alcohol






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






15. 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






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






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






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






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






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






21. Covalent bonding of the polymer backbone and side groups






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






23. 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






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






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






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






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






28. Atoms attached to the polymer backbone.






29. Primary raw material for most polymers






30. 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






31. 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






32. 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






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






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






35. Coloring agents that do not dissolve into the polymer






36. 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






37. Relative configuration of adjecent asymmetric carbons






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






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






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






41. Simple polymeric material produced as pellets in large quantities






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






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






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






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






47. 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






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






49. 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






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