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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. Number of repeat/structural units in a polymer chain






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. 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






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






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






6. Simple polymeric material produced as pellets in large quantities






7. Number of bonds a molecule has formed






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. 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






10. 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






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






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






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






14. 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






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






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






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






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






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






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






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






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






23. Porcess of breaking large organic hydrocarbons into smaller molecules






24. 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






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






26. 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






27. Coloring agents that do not dissolve into the polymer






28. Atoms attached to the polymer backbone.






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






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






31. 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






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






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






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






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






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






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






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






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






40. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






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






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






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






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






45. Molecule containing a highly reactive unpaired electron






46. An acid and an alcohol






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






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






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






50. Is not asymetric and cannot have multiple configurations