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






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






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






4. 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






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






6. 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






7. 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






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






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






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






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






12. Molecule containing a highly reactive unpaired electron






13. An acid and an alcohol






14. 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






15. 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






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






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






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






19. 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






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






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






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






23. Simple polymeric material produced as pellets in large quantities






24. Covalent bonding of the polymer backbone and side groups






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






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






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






28. 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






29. Polymer that is made up a single repeat unit






30. Smallest repeating unit in a polymer. aka repeat unit






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






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






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






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






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






36. 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






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






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






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






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






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






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






43. 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






44. Number of bonds a molecule has formed






45. Double bounded organic molecule used to begin addition polymerization






46. Primary raw material for most polymers






47. Coloring agents that do not dissolve into the polymer






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






49. 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






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