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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. 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






2. 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






3. Softening agents






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






5. 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






6. 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






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






8. 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






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






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






11. 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






12. Polymer that is made up a single repeat unit






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






14. 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






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






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






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






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






19. Simple polymeric material produced as pellets in large quantities






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






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






22. Is not asymetric and cannot have multiple configurations






23. An acid and an alcohol






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






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






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






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






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






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






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






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






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






33. Coloring agents that do not dissolve into the polymer






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






35. Primary raw material for most polymers






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






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






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






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






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






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






42. Number of bonds a molecule has formed






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






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






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






46. Double bounded organic molecule used to begin addition polymerization






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






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






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






50. 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