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






2. Coloring agents that do not dissolve into the polymer






3. 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






4. 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






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






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






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






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






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






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






11. Simple polymeric material produced as pellets in large quantities






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






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






14. Is not asymetric and cannot have multiple configurations






15. Double bounded organic molecule used to begin addition polymerization






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






17. 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






18. 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






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






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






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






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






23. Number of bonds a molecule has formed






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






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






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






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






28. 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






29. Atoms attached to the polymer backbone.






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






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






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






33. Relative configuration of adjecent asymmetric carbons






34. 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






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






36. 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






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






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






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






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






41. 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






42. 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






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






44. 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






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






46. Polymer that is made up a single repeat unit






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






48. Covalent bonding of the polymer backbone and side groups






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






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