Test your basic knowledge |

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. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






7. Primary raw material for most polymers






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






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






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






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






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






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






14. Arrangement of the largest substituents where the substituets are offset by 120






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






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






17. Simple polymeric material produced as pellets in large quantities






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






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






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






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






22. Coloring agents that do not dissolve into the polymer






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






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






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






26. Molecule containing a highly reactive unpaired electron






27. Relative configuration of adjecent asymmetric carbons






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






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






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






31. Atoms attached to the polymer backbone.






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






33. 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






34. 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






35. Covalent bonding of the polymer backbone and side groups






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






37. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties






38. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






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






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






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






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






43. 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






44. Smallest repeating unit in a polymer. aka repeat 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. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals






48. Double bounded organic molecule used to begin addition polymerization






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






50. 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