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






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






3. 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






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






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






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






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






8. Atoms attached to the polymer backbone.






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






10. Is not asymetric and cannot have multiple configurations






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






12. Relative configuration of adjecent asymmetric carbons






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






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






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






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






17. 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






18. Double bounded organic molecule used to begin addition polymerization






19. 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






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






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






22. 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






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






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






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






26. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared






27. 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






28. Simple polymeric material produced as pellets in large quantities






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






30. 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






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






32. Polymer that is made up a single repeat unit






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






34. 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






35. 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






36. 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






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






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






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






40. 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






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






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






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






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






45. Molecule containing a highly reactive unpaired electron






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






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






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






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






50. Coloring agents that do not dissolve into the polymer






//