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






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






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






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






5. 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






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






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






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






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






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






11. 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






12. 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






13. Atoms attached to the polymer backbone.






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






15. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






20. Covalent bonding of the polymer backbone and side groups






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






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






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






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






25. Polymer that is made up a single repeat unit






26. 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






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






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






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






30. Molecule containing a highly reactive unpaired electron






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






32. 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






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






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






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






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






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






39. Softening agents






40. 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






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






42. 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






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






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






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






46. 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






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






48. 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






49. An acid and an alcohol






50. Number of bonds a molecule has formed