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






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






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






4. 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






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






6. 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






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






8. Is not asymetric and cannot have multiple configurations






9. 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






10. Number of bonds a molecule has formed






11. 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






12. 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






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






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






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






16. 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






17. 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






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






19. Polymer that is made up a single repeat unit






20. An acid and an alcohol






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






22. 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






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






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






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






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






27. 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






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






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






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






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






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






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






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






35. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






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






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






44. 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






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






46. 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






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






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






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






50. Molecule containing a highly reactive unpaired electron