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






2. 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






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






4. 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






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






6. 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






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






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






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






10. Primary raw material for most polymers






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






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






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






14. 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






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






16. 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






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






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






19. Relative configuration of adjecent asymmetric carbons






20. 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






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






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






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






24. Polymer that is made up a single repeat unit






25. 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






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






27. Number of bonds a molecule has formed






28. Double bounded organic molecule used to begin addition polymerization






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






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






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






32. Atoms attached to the polymer backbone.






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






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






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






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






37. 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






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






39. 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






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






41. Simple polymeric material produced as pellets in large quantities






42. 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






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






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






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






46. Softening agents






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






48. 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






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






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