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






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






3. Softening agents






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






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






6. Polymer that is made up a single repeat unit






7. 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






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






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






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






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






12. Covalent bonding of the polymer backbone and side groups






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






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






16. 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






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






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






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






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






21. 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






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






23. Primary raw material for most polymers






24. Is not asymetric and cannot have multiple configurations






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






26. 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






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






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






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






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






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






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






33. 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






34. Number of bonds a molecule has formed






35. Simple polymeric material produced as pellets in large quantities






36. 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






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






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






39. Molecule containing a highly reactive unpaired electron






40. 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






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






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






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






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






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






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






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






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






49. 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






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