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






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






3. Covalent bonding of the polymer backbone and side groups






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






5. Molecule containing a highly reactive unpaired electron






6. 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






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






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






9. Polymer that is made up a single repeat unit






10. 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






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






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






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






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






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






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






17. Is not asymetric and cannot have multiple configurations






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






19. 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






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






21. 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






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






23. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber






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






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






26. 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






27. 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






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






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






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






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






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






33. Number of bonds a molecule has formed






34. 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






35. 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






36. Softening agents






37. 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






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






39. Simple polymeric material produced as pellets in large quantities






40. 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






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






42. 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






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






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






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






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






47. Atoms attached to the polymer backbone.






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






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






50. Double bounded organic molecule used to begin addition polymerization