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






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






3. 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






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






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






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






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






8. Number of bonds a molecule has formed






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






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






11. 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






12. 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






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






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






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






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






17. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads






18. Porcess of breaking large organic hydrocarbons into smaller molecules






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






20. Formation of a plymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chains. this reaction also forms a biproduct - usually water






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






22. Simple polymeric material produced as pellets in large quantities






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






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






25. An acid and an alcohol






26. 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






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






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






30. 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






31. 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






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






33. Softening agents






34. 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






35. 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






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






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






38. Primary raw material for most polymers






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






40. Relative configuration of adjecent asymmetric carbons






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






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






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






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






45. 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






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






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






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






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






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