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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. 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






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






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






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






6. Relative configuration of adjecent asymmetric carbons






7. 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






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






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






10. Primary raw material for most polymers






11. 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






12. 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






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






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






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






16. An acid and an alcohol






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






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






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






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






21. Covalent bonding of the polymer backbone and side groups






22. 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






23. Porcess of breaking large organic hydrocarbons into smaller molecules






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






25. Simple polymeric material produced as pellets in large quantities






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






27. Softening agents






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






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






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






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






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






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






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






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






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






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






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






39. 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






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






41. 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






42. Coloring agents that do not dissolve into the polymer






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






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






45. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density






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






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






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






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






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