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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. 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






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






3. Softening agents






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






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






6. Coloring agents that do not dissolve into the polymer






7. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density






8. Number of bonds a molecule has formed






9. 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






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






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






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. 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






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






15. 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






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






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






18. 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






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






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






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






23. Molecule containing a highly reactive unpaired electron






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






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






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






27. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






33. Primary raw material for most polymers






34. Polymer that is made up a single repeat unit






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






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






37. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






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






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






40. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






46. 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






47. An acid and an alcohol






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






49. Relative configuration of adjecent asymmetric carbons






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