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






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






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






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






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






6. Molecule containing a highly reactive unpaired electron






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






8. Primary raw material for most polymers






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






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






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






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






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






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






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






16. Relative configuration of adjecent asymmetric carbons






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






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






19. 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






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






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






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






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






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






25. 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






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






27. 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






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






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






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






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






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






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






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






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






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






37. Simple polymeric material produced as pellets in large quantities






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






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






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






42. 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






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






44. Is not asymetric and cannot have multiple configurations






45. 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






46. 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






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






48. 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






49. Number of bonds a molecule has formed






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