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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 contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber






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






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






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






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






6. 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






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






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






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






10. 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






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






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






15. 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






16. 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






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






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






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






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






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






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






23. 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






24. Atoms attached to the polymer backbone.






25. Softening agents






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






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






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






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






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






31. Polymer that is made up a single repeat unit






32. Covalent bonding of the polymer backbone and side groups






33. Double bounded organic molecule used to begin addition polymerization






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






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






36. 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






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






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






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






40. Number of bonds a molecule has formed






41. Porcess of breaking large organic hydrocarbons into smaller molecules






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






43. Additives whose primary purpose is to reduce the final cost of the product






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






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






46. 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






47. 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






48. Relative configuration of adjecent asymmetric carbons






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






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