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






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






3. 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






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






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






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






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






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






9. Simple polymeric material produced as pellets in large quantities






10. 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






11. 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






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






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






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






15. 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






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






17. 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






18. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.






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






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






21. 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






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






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






24. Porcess of breaking large organic hydrocarbons into smaller molecules






25. Covalent bonding of the polymer backbone and side groups






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






27. 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






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






29. 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






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






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






32. An acid and an alcohol






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






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






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






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






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






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






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






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






42. Coloring agents that do not dissolve into the polymer






43. Double bounded organic molecule used to begin addition polymerization






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






45. Molecule containing a highly reactive unpaired electron






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






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






48. 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






49. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA






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