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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. 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






2. Softening agents






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






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






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






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






7. Number of bonds a molecule has formed






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






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






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






11. 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






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






13. 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






14. Polymer that is made up a single repeat unit






15. 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






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






19. 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






20. 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






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






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






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






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






26. 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






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






28. Coloring agents that do not dissolve into the polymer






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






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






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






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






33. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit






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






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






36. Covalent bonding of the polymer backbone and side groups






37. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared






38. Is not asymetric and cannot have multiple configurations






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






40. Double bounded organic molecule used to begin addition polymerization






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






42. Atoms attached to the polymer backbone.






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






44. Relative configuration of adjecent asymmetric carbons






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






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






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






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






49. 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






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