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






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






3. Simple polymeric material produced as pellets in large quantities






4. 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






5. 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






6. 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






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






8. 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






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






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






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






12. 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






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






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






15. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret






16. Softening agents






17. Polymer that is made up a single repeat unit






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






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






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






21. 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






22. Double bounded organic molecule used to begin addition polymerization






23. 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






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






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






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






27. 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






28. Primary raw material for most polymers






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






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






32. 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






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






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






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






36. Molecule containing a highly reactive unpaired electron






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






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






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






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






41. 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






42. 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






43. An acid and an alcohol






44. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






50. Atoms attached to the polymer backbone.