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






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






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






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






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






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






7. 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






8. Simple polymeric material produced as pellets in large quantities






9. An acid and an alcohol






10. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain






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






12. 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






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






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






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






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






19. Relative configuration of adjecent asymmetric carbons






20. Softening agents






21. 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






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






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






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






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






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






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. Is not asymetric and cannot have multiple configurations






29. Molecule containing a highly reactive unpaired electron






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






31. 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






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






33. Porcess of breaking large organic hydrocarbons into smaller molecules






34. 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






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






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






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






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






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






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






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






43. 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






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






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






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






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






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






49. Atoms attached to the polymer backbone.






50. Primary raw material for most polymers