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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. 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






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






3. 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






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






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






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






7. 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






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






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






12. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end






13. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






16. 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






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






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






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






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






21. 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






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






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






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






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






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






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






28. Is not asymetric and cannot have multiple configurations






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. An acid and an alcohol






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






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






33. Primary raw material for most polymers






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






35. Covalent bonding of the polymer backbone and side groups






36. 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






37. 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






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






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






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






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






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






44. Relative configuration of adjecent asymmetric carbons






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






46. 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






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






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






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






50. Double bounded organic molecule used to begin addition polymerization