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






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






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






4. 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






5. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared






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






7. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






8. 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






9. Coloring agents that do not dissolve into the polymer






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






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






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






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






14. Polymer that is made up a single repeat unit






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






16. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group






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






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






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






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






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






22. Primary raw material for most polymers






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






24. Simple polymeric material produced as pellets in large quantities






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






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






27. 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






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






29. Number of bonds a molecule has formed






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






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






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






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






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






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






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






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






38. 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






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






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






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






43. 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






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






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






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






47. 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






48. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device






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






50. Softening agents