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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. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






7. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants






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






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






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






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






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






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






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






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






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






17. Number of bonds a molecule has formed






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






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






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






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






22. 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






23. Relative configuration of adjecent asymmetric carbons






24. 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






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






26. Primary raw material for most polymers






27. 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






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






29. 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






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






31. 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






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






33. Molecule containing a highly reactive unpaired electron






34. 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






35. Polymer that is made up a single repeat unit






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






37. 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






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






39. 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






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






41. 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






42. 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






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






44. 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






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






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






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






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






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






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