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






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






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






4. Primary raw material for most polymers






5. Polymer that is made up a single repeat unit






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






7. 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






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






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






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






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






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






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






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






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






16. Coloring agents that do not dissolve into the polymer






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






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






19. Molecule containing a highly reactive unpaired electron






20. Porcess of breaking large organic hydrocarbons into smaller molecules






21. 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






22. 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






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






24. An acid and an alcohol






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






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






27. Simple polymeric material produced as pellets in large quantities






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. Atoms attached to the polymer backbone.






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






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






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






33. 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






34. Process of pushing polymers through a spinneret and winding the solidified fibers onto a tow - which imposes a shear stress on the fibers upstream as they emerge from the spinneret






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






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






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






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






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






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






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






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






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






44. 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






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






46. 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






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






48. 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






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






50. 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