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






2. 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






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






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






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






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






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






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






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






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






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






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






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






14. 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






15. 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






16. 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






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






18. 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






19. 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






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






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






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






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






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






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






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






27. Polymer that is made up a single repeat unit






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






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






30. Simple polymeric material produced as pellets in large quantities






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






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






33. Coloring agents that do not dissolve into the polymer






34. Molecule containing a highly reactive unpaired electron






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






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. Atoms attached to the polymer backbone.






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






39. 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






40. 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






41. 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






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






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






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






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






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






47. 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






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






49. 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






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