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






2. 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






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






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






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






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






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






8. 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






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






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






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






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






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






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






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






16. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






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






23. Is not asymetric and cannot have multiple configurations






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






25. An acid and an alcohol






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






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






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






29. Polymer that is made up a single repeat unit






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






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






32. 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






33. 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






34. 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






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






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






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






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






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






40. 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






41. 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






42. Relative configuration of adjecent asymmetric carbons






43. 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






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






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






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






47. Coloring agents that do not dissolve into the polymer






48. 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






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






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