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






2. 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






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






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. 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






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






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






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






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






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






11. 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






12. Porcess of breaking large organic hydrocarbons into smaller molecules






13. An acid and an alcohol






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






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






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






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






18. 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






19. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






33. 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






34. Number of bonds a molecule has formed






35. Softening agents






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






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






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






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






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






41. 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






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






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






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






45. Coloring agents that do not dissolve into the polymer






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






47. Atoms attached to the polymer backbone.






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






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






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