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






2. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret






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






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






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






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






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






8. Atoms attached to the polymer backbone.






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






10. Number of bonds a molecule has formed






11. 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






12. 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






13. 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






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






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






16. 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






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






18. 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






19. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






25. Softening agents






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






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






28. Covalent bonding of the polymer backbone and side groups






29. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






35. 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






36. Double bounded organic molecule used to begin addition polymerization






37. 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






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






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






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






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






42. 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






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






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






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






46. 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






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






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






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






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