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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. Primary raw material for most polymers






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






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






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






5. 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






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






7. Additives whose primary purpose is to reduce the final cost of the product






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






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






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






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






12. 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






13. Atoms attached to the polymer backbone.






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






15. 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






16. Covalent bonding of the polymer backbone and side groups






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






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






19. Double bounded organic molecule used to begin addition polymerization






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






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






22. 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






23. 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






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






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






26. 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






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






28. Molecule containing a highly reactive unpaired electron






29. Coloring agents that do not dissolve into the polymer






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






31. Number of bonds a molecule has formed






32. Relative configuration of adjecent asymmetric carbons






33. 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






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






35. 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






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






37. Is not asymetric and cannot have multiple configurations






38. Process used to make thermoset fibers by performing the polymerization reacting in a solbent as the material flows through a spinneret and into a quenching bath






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






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






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






42. 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






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






44. Softening agents






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






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






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






48. An acid and an alcohol






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






50. 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