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. 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






2. 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






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






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






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






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






7. 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






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






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






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






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






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






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






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






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






16. 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






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






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






19. 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






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






21. Relative configuration of adjecent asymmetric carbons






22. 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






23. 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






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






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






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






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






28. 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






29. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






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






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






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






38. Coloring agents that do not dissolve into the polymer






39. Polymer that is made up a single repeat unit






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






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






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






43. Number of bonds a molecule has formed






44. Primary raw material for most polymers






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






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






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






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






49. Is not asymetric and cannot have multiple configurations






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