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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. Molecule containing a highly reactive unpaired electron






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






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






4. 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






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






6. 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






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






8. Simple polymeric material produced as pellets in large quantities






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






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






11. 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






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






13. 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






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






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






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






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






18. Softening agents






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






20. Atoms attached to the polymer backbone.






21. Coloring agents that do not dissolve into the polymer






22. 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






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






24. One type of polymer that contains at least 85% of polyacrylonitrile PAN






25. Covalent bonding of the polymer backbone and side groups






26. 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






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






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






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






30. An acid and an alcohol






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






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






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






34. Is not asymetric and cannot have multiple configurations






35. Double bounded organic molecule used to begin addition polymerization






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






37. 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






38. 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






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






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






41. 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






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






43. Number of bonds a molecule has formed






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






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






46. 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






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






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






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






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