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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. 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






2. Coloring agents that do not dissolve into the polymer






3. Primary raw material for most polymers






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






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






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






7. 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






8. Softening agents






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






10. 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






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






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






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






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






15. Is not asymetric and cannot have multiple configurations






16. 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






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






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






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






20. 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






21. 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






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






23. 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






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






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






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






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






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






29. An acid and an alcohol






30. Covalent bonding of the polymer backbone and side groups






31. 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






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






33. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






40. 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






41. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






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






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






44. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






49. Number of bonds a molecule has formed






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