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






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






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






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






5. Number of bonds a molecule has formed






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






7. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






13. 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






14. 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






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






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






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






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






19. Double bounded organic molecule used to begin addition polymerization






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






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. 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






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






24. Polymer that is made up a single repeat unit






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






26. 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






27. An acid and an alcohol






28. 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






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






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






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






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






33. Part of the polymer processing apparatus through which the polymer is pushed - causing the polymer to form a simple shape - such as a rod or tube






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






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






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






37. Softening agents






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






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






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






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






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






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






44. Primary raw material for most polymers






45. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






49. 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






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