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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. 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






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






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






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






5. 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






6. 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






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






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






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






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






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






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






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






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






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






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






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






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






20. Molecule containing a highly reactive unpaired electron






21. 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






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






23. 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






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






25. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion






26. Covalent bonding of the polymer backbone and side groups






27. Polymer that is made up a single repeat unit






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






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






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






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






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






33. 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






34. Atoms attached to the polymer backbone.






35. Double bounded organic molecule used to begin addition polymerization






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






37. Simple polymeric material produced as pellets in large quantities






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






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






40. Primary raw material for most polymers






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






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






43. 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






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






45. Is not asymetric and cannot have multiple configurations






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






47. 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






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






49. Softening agents






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