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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. 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






2. 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






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






4. 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






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






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






7. 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






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






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






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






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






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






14. Covalent bonding of the polymer backbone and side groups






15. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






21. Softening agents






22. 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






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






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






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






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






27. Porcess of breaking large organic hydrocarbons into smaller molecules






28. Polymer that is made up a single repeat unit






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






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






31. 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






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






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






34. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






40. 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






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






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






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






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






45. Primary raw material for most polymers






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






47. Double bounded organic molecule used to begin addition polymerization






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






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






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