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






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






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






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






5. Primary raw material for most polymers






6. 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






7. Atoms attached to the polymer backbone.






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






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






10. 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






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






12. One of the two different types of termination in the polymerization process. during this type of termination - the free radicals from two different polymer chains join to end the propogation process






13. Is not asymetric and cannot have multiple configurations






14. 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






15. Polymer that is made up a single repeat unit






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






17. Double bounded organic molecule used to begin addition polymerization






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






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






20. 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






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






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






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






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






25. Molecule containing a highly reactive unpaired electron






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






27. Simple polymeric material produced as pellets in large quantities






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






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






30. Covalent bonding of the polymer backbone and side groups






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






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






33. Porcess of breaking large organic hydrocarbons into smaller molecules






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






35. 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






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






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






38. 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






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






40. 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






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






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






43. An acid and an alcohol






44. 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






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






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






47. 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






48. 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






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






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