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






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






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






5. Porcess of breaking large organic hydrocarbons into smaller molecules






6. Double bounded organic molecule used to begin addition polymerization






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






8. 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






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






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






11. 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






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






13. 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






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






15. 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






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






17. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






23. 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






24. Is not asymetric and cannot have multiple configurations






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






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






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






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






29. 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






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






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






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






33. Softening agents






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






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






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






37. 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






38. 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






39. Relative configuration of adjecent asymmetric carbons






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






41. 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






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






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






44. 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






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






46. 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






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






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






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






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