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






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






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






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






5. 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






6. 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






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






8. 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






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






10. 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






11. Covalent bonding of the polymer backbone and side groups






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






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






14. Atoms attached to the polymer backbone.






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






16. Polymer that is made up a single repeat unit






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






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






19. An acid and an alcohol






20. Primary raw material for most polymers






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






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






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






24. 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






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






26. 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






27. 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






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






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






30. 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






31. 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






32. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






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






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






35. Softening agents






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






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






38. Molecule containing a highly reactive unpaired electron






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






40. 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






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






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






43. 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






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






45. Number of bonds a molecule has formed






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






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






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






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






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