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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. 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






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






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






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






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






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






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






8. Is not asymetric and cannot have multiple configurations






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






10. Number of bonds a molecule has formed






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






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






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






14. 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






15. 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






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






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






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






19. 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






20. 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






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






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






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






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






25. An acid and an alcohol






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






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






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






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






30. Polymer that is made up a single repeat unit






31. 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






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






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






34. 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






35. Relative configuration of adjecent asymmetric carbons






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






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






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






39. 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






40. Molecule containing a highly reactive unpaired electron






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






42. 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






43. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






49. Softening agents






50. 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