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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. 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






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






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






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






5. Double bounded organic molecule used to begin addition polymerization






6. 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






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






8. Molecule containing a highly reactive unpaired electron






9. 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






10. 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






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






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






13. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






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






20. 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






21. Softening agents






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






23. 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






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






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






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






27. 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






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






29. An acid and an alcohol






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






31. Atoms attached to the polymer backbone.






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






33. 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






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






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






36. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






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






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






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






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






46. 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






47. Primary raw material for most polymers






48. Number of bonds a molecule has formed






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