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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. 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






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






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






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






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






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






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






8. Coloring agents that do not dissolve into the polymer






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






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






11. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






17. Simple polymeric material produced as pellets in large quantities






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






19. 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






20. 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






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






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






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






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






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






26. 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






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






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






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






30. 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






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






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






33. Polymer that is made up a single repeat unit






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






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






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






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






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






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






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






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






42. Primary raw material for most polymers






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






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






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






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






47. Relative configuration of adjecent asymmetric carbons






48. 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






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






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