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. 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






2. 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






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






4. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






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






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






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






8. 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






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. Softening agents






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






13. Porcess of breaking large organic hydrocarbons into smaller molecules






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






15. Atoms attached to the polymer backbone.






16. 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






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






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






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






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






21. 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






22. Primary raw material for most polymers






23. 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






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






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






26. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






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






33. Relative configuration of adjecent asymmetric carbons






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






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






36. 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






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






39. Number of bonds a molecule has formed






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






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






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






43. 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






44. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






50. Polymer that is made up a single repeat unit