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






2. 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






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






4. 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






5. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






11. 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






12. 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






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






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






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






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






17. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






23. Coloring agents that do not dissolve into the polymer






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






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






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






27. 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






28. 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






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






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






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






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






33. 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






34. 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






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






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






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






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






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






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






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






42. Simple polymeric material produced as pellets in large quantities






43. 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






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






45. Primary raw material for most polymers






46. One type of polymer that contains at least 85% of polyacrylonitrile PAN






47. Molecule containing a highly reactive unpaired electron






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






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






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