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






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






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






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






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






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






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






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






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






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






11. Is not asymetric and cannot have multiple configurations






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






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






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






15. 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






16. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






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






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






24. 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






25. Softening agents






26. 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






27. Covalent bonding of the polymer backbone and side groups






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






29. 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






30. Primary raw material for most polymers






31. 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






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






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






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






35. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






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






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






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






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






45. 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






46. 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






47. 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






48. Porcess of breaking large organic hydrocarbons into smaller molecules






49. 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






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