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






2. Is not asymetric and cannot have multiple configurations






3. Relative configuration of adjecent asymmetric carbons






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






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






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






7. Softening agents






8. Covalent bonding of the polymer backbone and side groups






9. 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






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






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






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






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






14. 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






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






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






17. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






21. 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






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






23. 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






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






25. Number of bonds a molecule has formed






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






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






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






29. 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






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






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






32. 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






33. Double bounded organic molecule used to begin addition polymerization






34. 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






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






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






37. 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






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






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






40. 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






41. Primary raw material for most polymers






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






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






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






45. Atoms attached to the polymer backbone.






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






47. 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






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






49. 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






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