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






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






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






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






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






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






7. 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






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






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






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






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






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






13. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants






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






15. 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






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






17. Molecule containing a highly reactive unpaired electron






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






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






20. 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






21. 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






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






23. An acid and an alcohol






24. 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






25. 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






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






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






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






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






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






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






32. 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






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






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






35. Smallest repeating unit in a polymer. aka repeat unit






36. 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






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






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






40. 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






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






42. 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






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






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






45. Relative configuration of adjecent asymmetric carbons






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






47. Porcess of breaking large organic hydrocarbons into smaller molecules






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






49. 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






50. Is not asymetric and cannot have multiple configurations