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






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






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






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






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






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






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






8. Relative configuration of adjecent asymmetric carbons






9. 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






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






11. 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






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






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






14. 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






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






16. 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






17. 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






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






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






20. Simple polymeric material produced as pellets in large quantities






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






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






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






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






25. Atoms attached to the polymer backbone.






26. An acid and an alcohol






27. 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






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






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






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






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






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






33. 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






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






35. Double bounded organic molecule used to begin addition polymerization






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






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






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






39. 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






40. 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






41. Coloring agents that do not dissolve into the polymer






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






43. 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






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






45. Number of bonds a molecule has formed






46. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)






47. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






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






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






50. Primary raw material for most polymers