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






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






3. Relative configuration of adjecent asymmetric carbons






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






5. Softening agents






6. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






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






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






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






10. 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






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






12. Molecule containing a highly reactive unpaired electron






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






14. 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






15. 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






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






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






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






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






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






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






22. Double bounded organic molecule used to begin addition polymerization






23. Is not asymetric and cannot have multiple configurations






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






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






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






27. 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






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






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






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






31. Primary raw material for most polymers






32. 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






33. 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






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






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






36. 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






37. 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






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






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






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






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






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






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






44. 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






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






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






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






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






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






50. An acid and an alcohol