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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. 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






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






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






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






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






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






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






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






9. Covalent bonding of the polymer backbone and side groups






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






11. 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






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






13. 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






14. 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






15. 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






16. 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






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






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






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






20. 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






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






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






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






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






25. Coloring agents that do not dissolve into the polymer






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






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






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






29. 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






30. Softening agents






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






32. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end






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






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






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






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






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






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






39. An acid and an alcohol






40. Porcess of breaking large organic hydrocarbons into smaller molecules






41. 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






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






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






45. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit






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






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






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






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






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