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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. 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






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






4. 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






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






6. Primary raw material for most polymers






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






8. Covalent bonding of the polymer backbone and side groups






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






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






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






12. Simple polymeric material produced as pellets in large quantities






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






14. Coloring agents that do not dissolve into the polymer






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






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






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






19. 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






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






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






22. 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






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






24. 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






25. Number of bonds a molecule has formed






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






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. 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






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






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






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






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






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






34. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






40. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance






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






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






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






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






45. Atoms attached to the polymer backbone.






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






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






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






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






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