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






2. 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






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






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






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






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






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






8. 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






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






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






11. Molecule containing a highly reactive unpaired electron






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






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






14. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






20. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






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






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






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






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






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






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






33. 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






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






35. Covalent bonding of the polymer backbone and side groups






36. Is not asymetric and cannot have multiple configurations






37. Simple polymeric material produced as pellets in large quantities






38. 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






39. 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






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






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






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






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






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






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






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






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






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






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






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