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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. 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






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






3. 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






4. 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






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






6. 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






7. 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






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






9. Molecule containing a highly reactive unpaired electron






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






11. 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






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






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






14. 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






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






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






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






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






19. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance






20. 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






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






22. Porcess of breaking large organic hydrocarbons into smaller molecules






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






24. Coloring agents that do not dissolve into the polymer






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






26. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






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






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






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






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






36. 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






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






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






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






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






41. Softening agents






42. 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






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






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






45. 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






46. Is not asymetric and cannot have multiple configurations






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






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






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






50. Number of bonds a molecule has formed