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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. Polymer that is made up a single repeat unit






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






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






4. 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






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






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






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






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






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






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






11. 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






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






13. Covalent bonding of the polymer backbone and side groups






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






15. Double bounded organic molecule used to begin addition polymerization






16. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






33. 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






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






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






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






37. 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






38. Polymer made up of two of more differenet monomers covalently bonded together






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






40. 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






41. 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






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






43. An acid and an alcohol






44. Softening agents






45. Relative configuration of adjecent asymmetric carbons






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






47. 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






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






49. Simple polymeric material produced as pellets in large quantities






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