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






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






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






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






6. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)






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






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






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






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






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






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






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






14. 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






15. 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






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






17. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret






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






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






20. Polymer that is made up a single repeat unit






21. 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






22. 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






23. 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






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






25. Covalent bonding of the polymer backbone and side groups






26. 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






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






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






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






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






31. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






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






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






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






40. Molecule containing a highly reactive unpaired electron






41. Relative configuration of adjecent asymmetric carbons






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






43. Softening agents






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






45. 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






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






47. 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






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






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






50. 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