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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. 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






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






3. An acid and an alcohol






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






5. Simple polymeric material produced as pellets in large quantities






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






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






8. Covalent bonding of the polymer backbone and side groups






9. 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






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






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






12. Softening agents






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






14. 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






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






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






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






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






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






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






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






22. Relative configuration of adjecent asymmetric carbons






23. Is not asymetric and cannot have multiple configurations






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. Double bounded organic molecule used to begin addition polymerization






26. 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






27. Atoms attached to the polymer backbone.






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






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






30. 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






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






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






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






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






35. 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






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






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






38. 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






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






40. 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






41. Specific arrangements of atoms that cause organic compounds to behave in predictable ways






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






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






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






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






46. 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






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






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






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






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






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