Test your basic knowledge |

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






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






3. 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






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






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






6. An acid and an alcohol






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






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






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






10. 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






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






12. 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






13. Simple polymeric material produced as pellets in large quantities






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






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






16. 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






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






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






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






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






21. 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






22. 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






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






24. 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






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






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






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






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






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






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






31. 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






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






33. 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






34. Covalent bonding of the polymer backbone and side groups






35. 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






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






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






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






39. 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






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






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






42. Relative configuration of adjecent asymmetric carbons






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






44. Atoms attached to the polymer backbone.






45. Primary raw material for most polymers






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






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






48. 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






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






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