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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. 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






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






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






4. Double bounded organic molecule used to begin addition polymerization






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






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






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






8. Atoms attached to the polymer backbone.






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






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






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






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






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






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






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






16. 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






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






18. 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






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






20. 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






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






22. 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






23. 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






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






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






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






27. Is not asymetric and cannot have multiple configurations






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






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






30. Broad category of polymers that includes polymers containing urethane linkages






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






32. Number of bonds a molecule has formed






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






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






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






36. 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






37. 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






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






39. 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






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






41. Simple polymeric material produced as pellets in large quantities






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






43. 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






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






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






46. Coloring agents that do not dissolve into the polymer






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






48. 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






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






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