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






2. 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






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






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






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






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






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






8. 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






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






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






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






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






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






14. 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






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






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






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






18. 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






19. 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






20. Simple polymeric material produced as pellets in large quantities






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






23. Number of bonds a molecule has formed






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






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






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






27. Double bounded organic molecule used to begin addition polymerization






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






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






30. An acid and an alcohol






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






32. Relative configuration of adjecent asymmetric carbons






33. 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






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






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






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






37. Softening agents






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






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






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






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






42. Atoms attached to the polymer backbone.






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






44. 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






45. 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






46. Polymer that is made up a single repeat unit






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






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






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






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