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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 polymer processing apparatus through which the polymer is pushed - causing the polymer to form a simple shape - such as a rod or tube






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






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






4. 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






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






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






7. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group






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






9. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






12. 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






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






14. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.






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






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






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






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






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






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






21. 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






22. 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






23. 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






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






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






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






27. Number of bonds a molecule has formed






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






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






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






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






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






33. 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






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. 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






36. Covalent bonding of the polymer backbone and side groups






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






38. Double bounded organic molecule used to begin addition polymerization






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






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






41. 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






42. 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






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






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






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






46. Simple polymeric material produced as pellets in large quantities






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






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






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






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