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. 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






2. 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






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






4. Atoms attached to the polymer backbone.






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






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






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






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






9. 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






10. Coloring agents that do not dissolve into the polymer






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






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






13. Process used to make thermoset fibers by performing the polymerization reacting in a solbent as the material flows through a spinneret and into a quenching bath






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






15. 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






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






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






18. 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






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






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






21. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






27. 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






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






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






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






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






32. 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






33. Molecule containing a highly reactive unpaired electron






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






35. 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






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






37. Double bounded organic molecule used to begin addition polymerization






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






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






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






41. Relative configuration of adjecent asymmetric carbons






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






43. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...






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






45. An acid and an alcohol






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






47. Softening agents






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






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






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