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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. Atoms attached to the polymer backbone.






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






4. Relative configuration of adjecent asymmetric carbons






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






6. 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






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






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






9. Double bounded organic molecule used to begin addition polymerization






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






11. 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






12. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






18. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






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






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






21. 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






22. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants






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






24. Is not asymetric and cannot have multiple configurations






25. 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






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






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






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






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






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






31. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






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






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






39. Number of bonds a molecule has formed






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






41. 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






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






43. 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






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






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






46. 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






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






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






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






50. 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