Test your basic knowledge |

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






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






3. 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






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






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






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






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






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






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






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






11. An acid and an alcohol






12. 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






13. Porcess of breaking large organic hydrocarbons into smaller molecules






14. Molecule containing a highly reactive unpaired electron






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






16. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets






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






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






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






20. Double bounded organic molecule used to begin addition polymerization






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






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






23. 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






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






25. Polymer that is made up a single repeat unit






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






27. 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






28. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






34. 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






35. Simple polymeric material produced as pellets in large quantities






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






37. Is not asymetric and cannot have multiple configurations






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






39. 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






40. 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






41. Smallest repeating unit in a polymer. aka repeat unit






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






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






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






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






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






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






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






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






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