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






2. 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






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






4. 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






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






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






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






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






9. 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






10. Coloring agents that do not dissolve into the polymer






11. Number of bonds a molecule has formed






12. Polymer that is made up a single repeat unit






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






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






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






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






17. 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






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






19. 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






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






21. Softening agents






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






23. 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






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






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






26. 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






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






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






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






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






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






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






33. Covalent bonding of the polymer backbone and side groups






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






35. Simple polymeric material produced as pellets in large quantities






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






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






38. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






39. 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






40. An acid and an alcohol






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






42. 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






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






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






45. Molecule containing a highly reactive unpaired electron






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






47. 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






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






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






50. 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