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






2. 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






3. Primary raw material for most polymers






4. Molecule containing a highly reactive unpaired electron






5. 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






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






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






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






9. Porcess of breaking large organic hydrocarbons into smaller molecules






10. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






16. 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






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






18. 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






19. 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






20. Relative configuration of adjecent asymmetric carbons






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






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






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






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






25. 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






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






27. 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






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






29. 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






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






31. 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






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






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






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






35. Covalent bonding of the polymer backbone and side groups






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






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






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






39. 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






40. Simple polymeric material produced as pellets in large quantities






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






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






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






44. Coloring agents that do not dissolve into the polymer






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






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






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






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






49. Is not asymetric and cannot have multiple configurations






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