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






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






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






4. 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






5. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






8. 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






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






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






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






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






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






14. Coloring agents that do not dissolve into the polymer






15. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






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






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






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






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






20. An acid and an alcohol






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






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






24. Relative configuration of adjecent asymmetric carbons






25. Number of bonds a molecule has formed






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






27. 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






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






29. 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






30. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






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






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






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






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






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






42. 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






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






44. 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






45. Double bounded organic molecule used to begin addition polymerization






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






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






48. 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






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






50. 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