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






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






3. 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






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






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






6. Covalent bonding of the polymer backbone and side groups






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






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






9. 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






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






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






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






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






14. 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






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






16. An acid and an alcohol






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






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






19. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






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






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






27. Primary raw material for most polymers






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






29. 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






30. Molecule containing a highly reactive unpaired electron






31. Number of bonds a molecule has formed






32. 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






33. 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






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






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






36. Polymer that is made up a single repeat unit






37. Relative configuration of adjecent asymmetric carbons






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. 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






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






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






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






43. Atoms attached to the polymer backbone.






44. 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






45. Is not asymetric and cannot have multiple configurations






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






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






48. Porcess of breaking large organic hydrocarbons into smaller molecules






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






50. 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