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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. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow






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






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






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






5. Primary raw material for most polymers






6. 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






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






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






9. Specific arrangements of atoms that cause organic compounds to behave in predictable ways






10. Atoms attached to the polymer backbone.






11. Number of bonds a molecule has formed






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






13. 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






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






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






16. Molecule containing a highly reactive unpaired electron






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






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






19. 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






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






21. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed






22. 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






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






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






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






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






27. 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






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






29. 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






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






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






32. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






39. 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






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






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






42. 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






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






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






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






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






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






48. 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






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






50. Softening agents