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






2. Coloring agents that do not dissolve into the polymer






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






4. 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






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






6. An acid and an alcohol






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






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






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






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






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






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






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






14. Relative configuration of adjecent asymmetric carbons






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






16. 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






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






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






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






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






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






22. Molecule containing a highly reactive unpaired electron






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






24. 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






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






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






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






28. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber






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






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






31. 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






32. 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






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






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






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






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






37. 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






38. Polymer that is made up a single repeat unit






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






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






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






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






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






44. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






47. Simple polymeric material produced as pellets in large quantities






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






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






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