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






2. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance






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






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






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






6. 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






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






8. Number of bonds a molecule has formed






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






10. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






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






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






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






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






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






21. 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






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






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






24. Double bounded organic molecule used to begin addition polymerization






25. 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






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






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






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






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






30. 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






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






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






33. Molecule containing a highly reactive unpaired electron






34. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination






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






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






37. 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






38. Is not asymetric and cannot have multiple configurations






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






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






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






42. Polymer that is made up a single repeat unit






43. An acid and an alcohol






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






45. 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






46. 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






47. 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






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






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






50. Primary raw material for most polymers