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






2. Simple polymeric material produced as pellets in large quantities






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






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






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






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






7. An acid and an alcohol






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






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






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






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






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






13. 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






14. Is not asymetric and cannot have multiple configurations






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






16. 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






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






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






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






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






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






22. 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






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






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






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






26. 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






27. Atoms attached to the polymer backbone.






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






29. Relative configuration of adjecent asymmetric carbons






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






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






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






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






34. Number of bonds a molecule has formed






35. 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






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






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






38. 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






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






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






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






42. Coloring agents that do not dissolve into the polymer






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






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






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






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






47. Primary raw material for most polymers






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






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






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






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