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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. 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






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






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






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






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






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






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






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






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






10. 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






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






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






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






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






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






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






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






18. An acid and an alcohol






19. 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






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






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






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






23. 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






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






25. Is not asymetric and cannot have multiple configurations






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






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






28. Number of bonds a molecule has formed






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






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






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






32. 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






33. Atoms attached to the polymer backbone.






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






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






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






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






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






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






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






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






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






43. 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






44. 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






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






46. 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






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






48. Simple polymeric material produced as pellets in large quantities






49. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)






50. 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