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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. Conformation in which the largest substituents are offset by 180






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






3. Coloring agents that do not dissolve into the polymer






4. 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






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






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






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






8. Relative configuration of adjecent asymmetric carbons






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






10. 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






11. 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






12. Is not asymetric and cannot have multiple configurations






13. 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






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






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






16. 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






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






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






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






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






21. 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






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






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






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






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






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






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






28. 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






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






30. 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






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






32. Simple polymeric material produced as pellets in large quantities






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






34. Covalent bonding of the polymer backbone and side groups






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






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






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






38. Softening agents






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






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






41. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






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






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






44. 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






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






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






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






48. 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






49. Number of bonds a molecule has formed






50. Atoms attached to the polymer backbone.