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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. 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






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






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






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






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






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






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






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






9. 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






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






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






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






13. Double bounded organic molecule used to begin addition polymerization






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






15. 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






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






17. 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






18. Relative configuration of adjecent asymmetric carbons






19. Primary raw material for most polymers






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






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






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






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






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






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






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






27. Atoms attached to the polymer backbone.






28. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination






29. 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






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






31. 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






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






33. 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






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






35. Simple polymeric material produced as pellets in large quantities






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






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






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






39. Porcess of breaking large organic hydrocarbons into smaller molecules






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






41. 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






42. An acid and an alcohol






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






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






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






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






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






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






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






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