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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. Number of repeat/structural units in a polymer chain






2. 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






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






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






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






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






7. 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






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






9. Is not asymetric and cannot have multiple configurations






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






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






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






13. An acid and an alcohol






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






15. 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






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






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






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






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






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






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






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






23. 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






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






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






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






27. Additives whose primary purpose is to reduce the final cost of the product






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






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






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






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






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






33. 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






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






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






36. Simple polymeric material produced as pellets in large quantities






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






38. 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






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






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






42. 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






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






44. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber






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






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






47. Coloring agents that do not dissolve into the polymer






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






49. Polymer that is made up a single repeat unit






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