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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads






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






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






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






5. Two or more polymers mechanically mixed together but without covalent bonding between them






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






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






8. 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






9. Primary raw material for most polymers






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






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






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






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






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






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






16. Double bounded organic molecule used to begin addition polymerization






17. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow






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






19. 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






20. 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






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






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






23. Polymer that is made up a single repeat unit






24. 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






25. 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






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






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






28. 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






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






30. 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






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






32. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion






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






34. 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






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






36. Coloring agents that do not dissolve into the polymer






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






38. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






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






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






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






48. Porcess of breaking large organic hydrocarbons into smaller molecules






49. Simple polymeric material produced as pellets in large quantities






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