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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. 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






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






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






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






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






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






7. Is not asymetric and cannot have multiple configurations






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






9. 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






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






11. Polymer that is made up a single repeat unit






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






13. Number of bonds a molecule has formed






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






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






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






17. Softening agents






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






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






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






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






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






23. 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






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






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






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






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






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






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






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






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






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






33. 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






34. Primary raw material for most polymers






35. 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






36. 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






37. Porcess of breaking large organic hydrocarbons into smaller molecules






38. 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






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. 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






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






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






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






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






45. 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






46. 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






47. Coloring agents that do not dissolve into the polymer






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






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






50. Relative configuration of adjecent asymmetric carbons