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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. Double bounded organic molecule used to begin addition polymerization






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






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






4. Relative configuration of adjecent asymmetric carbons






5. An acid and an alcohol






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






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






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






9. 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






10. 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






11. 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






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






13. 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






14. Number of bonds a molecule has formed






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






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






17. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






33. 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






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






35. 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






36. Simple polymeric material produced as pellets in large quantities






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






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






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






40. 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






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






42. 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






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






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






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






46. Atoms attached to the polymer backbone.






47. Covalent bonding of the polymer backbone and side groups






48. Coloring agents that do not dissolve into the polymer






49. 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






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