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






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






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






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






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






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






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






9. 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






10. Molecule containing a highly reactive unpaired electron






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






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






13. 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






14. 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






15. Covalent bonding of the polymer backbone and side groups






16. 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






17. Pigments or dyes that change the way light is absorbed or reflected by a polymer






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






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






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






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






22. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






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






24. 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






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






26. 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






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






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






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






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






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






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






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






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






35. Simple polymeric material produced as pellets in large quantities






36. 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






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






38. Primary raw material for most polymers






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






40. Relative configuration of adjecent asymmetric carbons






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






42. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber






43. 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






44. An acid and an alcohol






45. 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






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






47. Coloring agents that do not dissolve into the polymer






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






49. 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






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