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






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






3. Relative configuration of adjecent asymmetric carbons






4. 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






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






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






7. 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






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






9. Covalent bonding of the polymer backbone and side groups






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






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






12. 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






13. 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






14. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group






15. Softening agents






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






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






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






19. Coloring agents that do not dissolve into the polymer






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






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






22. Atoms attached to the polymer backbone.






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






24. Molecule containing a highly reactive unpaired electron






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






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






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






28. Is not asymetric and cannot have multiple configurations






29. 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






30. 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






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






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






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






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






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






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






37. 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






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






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






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






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






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






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






44. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






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