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






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






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






4. 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






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






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






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






8. Primary raw material for most polymers






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






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






11. 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






12. 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






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






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






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






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






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






18. 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






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






20. 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






21. 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






22. 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






23. 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






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






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






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






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






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






29. 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






30. Simple polymeric material produced as pellets in large quantities






31. Covalent bonding of the polymer backbone and side groups






32. 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






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






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






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






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






37. 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






38. 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






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






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






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






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






43. Coloring agents that do not dissolve into the polymer






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






45. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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