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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. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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. Softening agents






21. Polymer that is made up a single repeat unit






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






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






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






26. 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






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






28. Is not asymetric and cannot have multiple configurations






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






30. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)






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






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






33. 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






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






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






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






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






38. Covalent bonding of the polymer backbone and side groups






39. Number of bonds a molecule has formed






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






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






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






43. 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






44. Carbon atom capable of multiple configurations due to four different substituents






45. Simple polymeric material produced as pellets in large quantities






46. Atoms attached to the polymer backbone.






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






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






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






50. 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