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. Number of repeat/structural units in a polymer chain






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






3. Is not asymetric and cannot have multiple configurations






4. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






10. 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






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






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






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






15. Atoms attached to the polymer backbone.






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






17. Softening agents






18. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets






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






20. 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






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






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






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






24. 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






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






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






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






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






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






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






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






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






33. Relative configuration of adjecent asymmetric carbons






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






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






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






37. 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






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






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






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






41. 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






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






43. Coloring agents that do not dissolve into the polymer






44. Double bounded organic molecule used to begin addition polymerization






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






46. 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






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






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






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






50. 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