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






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






4. 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






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






6. 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






7. 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






8. Relative configuration of adjecent asymmetric carbons






9. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






14. 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






15. Simple polymeric material produced as pellets in large quantities






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






17. 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






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






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






20. Coloring agents that do not dissolve into the polymer






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






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






23. 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






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






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






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






27. 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






28. Double bounded organic molecule used to begin addition polymerization






29. Primary raw material for most polymers






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






31. 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






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






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






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






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






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






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






39. An acid and an alcohol






40. Atoms attached to the polymer backbone.






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






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






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






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






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






46. Covalent bonding of the polymer backbone and side groups






47. Is not asymetric and cannot have multiple configurations






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






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






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