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






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






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






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






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






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






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






8. 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






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






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






11. 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






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






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






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






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






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






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






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






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






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






21. Molecule containing a highly reactive unpaired electron






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






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






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






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






26. 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






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






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






29. Polymer that is made up a single repeat unit






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






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






32. 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






33. 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






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. Double bounded organic molecule used to begin addition polymerization






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






37. Atoms attached to the polymer backbone.






38. Covalently bonded chains of molecules with small monomer units repeated from end to end






39. 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






40. Softening agents






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






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






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






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






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






46. 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






47. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains






48. 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






49. Relative configuration of adjecent asymmetric carbons






50. 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