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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. Relative configuration of adjecent asymmetric carbons






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






3. Softening agents






4. Double bounded organic molecule used to begin addition polymerization






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






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






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






8. Primary raw material for most polymers






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






10. Molecule containing a highly reactive unpaired electron






11. 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






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






13. 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






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






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






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






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






18. 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






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






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






21. 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






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






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






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






25. Coloring agents that do not dissolve into the polymer






26. 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






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






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






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






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






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






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






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. Number of bonds a molecule has formed






35. 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






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






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






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






40. 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






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






42. 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






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






44. 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






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






46. Atoms attached to the polymer backbone.






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






48. 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






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






50. 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