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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. Conformation in which the largest substituents are offset by 180






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






3. 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






4. 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






5. 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






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






7. 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






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






9. 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






10. Softening agents






11. Covalent bonding of the polymer backbone and side groups






12. Is not asymetric and cannot have multiple configurations






13. 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






14. Coloring agents that do not dissolve into the polymer






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






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






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






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






19. An acid and an alcohol






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






21. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret






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






23. 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






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






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






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






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






28. 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






29. Polymer that is made up a single repeat unit






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






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






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






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






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






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






36. Porcess of breaking large organic hydrocarbons into smaller molecules






37. 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






38. 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






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






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






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






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






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






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






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






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






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






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






49. 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






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