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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. Porcess of breaking large organic hydrocarbons into smaller molecules






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






3. Double bounded organic molecule used to begin addition polymerization






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






5. Simple polymeric material produced as pellets in large quantities






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






7. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






13. 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






14. 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






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






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






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






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






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






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






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






23. Molecule containing a highly reactive unpaired electron






24. 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






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






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






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






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






29. Polymer that is made up a single repeat unit






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






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






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






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






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






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






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






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






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






39. 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






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






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






42. Relative configuration of adjecent asymmetric carbons






43. 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






44. 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






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






46. 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






47. 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






48. 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






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






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