Test your basic knowledge |

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






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






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






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






5. 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






6. 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






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






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






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






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






11. 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






12. Primary raw material for most polymers






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






14. 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






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






16. Simple polymeric material produced as pellets in large quantities






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






18. An acid and an alcohol






19. 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






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






21. 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






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






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






24. Number of bonds a molecule has formed






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






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






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






28. Porcess of breaking large organic hydrocarbons into smaller molecules






29. 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






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






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






32. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






46. 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






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






48. Double bounded organic molecule used to begin addition polymerization






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






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