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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 agents that do not dissolve into the polymer






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






3. 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






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






5. 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






6. 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






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






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






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






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






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






12. 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






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






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






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






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






17. 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






18. Is not asymetric and cannot have multiple configurations






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






20. An acid and an alcohol






21. Softening agents






22. 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






23. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






39. Molecule containing a highly reactive unpaired electron






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






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






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






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






44. 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






45. Relative configuration of adjecent asymmetric carbons






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






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






48. Double bounded organic molecule used to begin addition polymerization






49. 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






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