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






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






3. 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






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






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






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






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






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






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






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






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






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






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






15. First step in the process of polymerization - during which a free radical is formed






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






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






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






19. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)






20. Molecule containing a highly reactive unpaired electron






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






22. 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






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






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






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






26. Softening agents






27. 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






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






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






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






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






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






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






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






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






36. Polymer that is made up a single repeat unit






37. Atoms attached to the polymer backbone.






38. Coloring agents that do not dissolve into the polymer






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






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






41. 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






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






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






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






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






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






47. Covalent bonding of the polymer backbone and side groups






48. 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






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






50. An acid and an alcohol