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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. Atoms attached to the polymer backbone.






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






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






4. 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






5. Molecule containing a highly reactive unpaired electron






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






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






8. 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






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






10. 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






11. 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






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






13. 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






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






15. Is not asymetric and cannot have multiple configurations






16. 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






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






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






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






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






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






23. 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






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






25. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






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






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






28. 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






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






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






31. An acid and an alcohol






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






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






34. 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






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






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






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






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






39. Porcess of breaking large organic hydrocarbons into smaller molecules






40. Coloring agents that do not dissolve into the polymer






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






42. 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






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






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






45. Relative configuration of adjecent asymmetric carbons






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






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






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






49. Number of bonds a molecule has formed






50. Softening agents