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






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






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






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






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






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






7. An acid and an alcohol






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






9. 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






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






11. 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






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






13. 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






14. 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






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






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






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






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






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






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






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






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






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






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






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






26. Is not asymetric and cannot have multiple configurations






27. First step in the process of polymerization - during which a free radical is formed






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






29. 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






30. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties






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






32. Softening agents






33. Simple polymeric material produced as pellets in large quantities






34. 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






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






36. Coloring agents that do not dissolve into the polymer






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






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






39. Porcess of breaking large organic hydrocarbons into smaller molecules






40. 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






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






42. Molecule containing a highly reactive unpaired electron






43. 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






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






45. 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






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






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






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






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






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