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






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






3. Atoms attached to the polymer backbone.






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






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






6. Polymer that is made up a single repeat unit






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






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






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






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






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






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






13. 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






14. Primary raw material for most polymers






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






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






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






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






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






20. 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






21. Double bounded organic molecule used to begin addition polymerization






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






23. An acid and an alcohol






24. Softening agents






25. 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






26. Relative configuration of adjecent asymmetric carbons






27. 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






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






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






30. 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






31. Porcess of breaking large organic hydrocarbons into smaller molecules






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






33. 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






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






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






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






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






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






39. 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






40. 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






41. Number of bonds a molecule has formed






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






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






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






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






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






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






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






49. 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






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