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






4. 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






5. 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






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






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






8. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






14. Softening agents






15. Is not asymetric and cannot have multiple configurations






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






17. Number of bonds a molecule has formed






18. 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






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






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






21. Primary raw material for most polymers






22. Molecule containing a highly reactive unpaired electron






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






24. Porcess of breaking large organic hydrocarbons into smaller molecules






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






26. 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






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






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






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






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






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






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






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






34. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow






35. Coloring agents that do not dissolve into the polymer






36. 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






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






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






39. Polymer that is made up a single repeat unit






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






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






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






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






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






45. An acid and an alcohol






46. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties






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






48. Covalent bonding of the polymer backbone and side groups






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






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