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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. Coloring agents that do not dissolve into the polymer






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






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






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






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






7. Molecule containing a highly reactive unpaired electron






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






9. 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






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






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






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






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






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






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






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






17. 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






18. 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






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






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






21. 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






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






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






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






25. Number of bonds a molecule has formed






26. Polymer that is made up a single repeat unit






27. 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






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






29. Covalent bonding of the polymer backbone and side groups






30. Simple polymeric material produced as pellets in large quantities






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






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






33. 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






34. 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






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






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






37. 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






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






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






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






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






42. An acid and an alcohol






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






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






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






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






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






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






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