Test your basic knowledge |

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






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






3. 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






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






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






6. 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






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






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






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






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






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






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






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






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






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






16. Covalent bonding of the polymer backbone and side groups






17. Atoms attached to the polymer backbone.






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






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






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






21. Polymer that is made up a single repeat unit






22. Relative configuration of adjecent asymmetric carbons






23. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air






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






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






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






27. Molecule containing a highly reactive unpaired electron






28. Softening agents






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






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






31. 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






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






33. 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






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






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






36. Porcess of breaking large organic hydrocarbons into smaller molecules






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






38. 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






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






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






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






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






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






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






45. Primary raw material for most polymers






46. 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






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






48. 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






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






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