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Test your basic knowledge |
Modern Material Science And Engineering 2
Start Test
Study First
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. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermosets
block copolymers
polyurethanes
primary termination
2. 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
injection molding
tacticity
functionality
solution spinning
3. 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
asymetric
melt spinning
injection molding
pigments
4. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
polyesters
vulcanization
constitution
structural unit
5. 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
nylon
asymetric
functionality
die
6. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
number average molecular weight Mn
extruder
quenching
7. 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
mutual termination
propagation
polymethylmethacrylate PMMA
die
8. An acid and an alcohol
isotactic dan
condensation/step- growth polymerization
alternating copolymers
most common condensation/step- growth polymerization occur between....
9. Polymer that is made up a single repeat unit
polymer backbone
homopolymer
polypphenylene terephyhalamide PPTA
additives
10. Coloring agents that do not dissolve into the polymer
pigments
condensation/step- growth polymerization
relative molecular mass RMM
tow
11. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
oligomers
end groups
cracking
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
injection molding
copolymer
isotactic dan
staggered conformation
13. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
aramid
coloring agents
degree of polymerization DPn
extruder
14. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
extruder
hopper
initiation
termination
15. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
nylon
structural unit
polyurethanes
poly- p- phenylene benzobisoxazole PBO
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
branching
step- growth/condensation polymerization
die
random copolymers
17. Carbon atom capable of multiple configurations due to four different substituents
structural unit
isotactic dan
asymetric
glass transition temperature Tg
18. Arrangement of the largest substituents where the substituets are offset by 120
random copolymers
staggered conformation
plyacrylonitrile PAN
solution spinning
19. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
polyviyl chloride PVC
atactic
plasticizers
cracking
20. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
poly- p- phenylene benzobisoxazole PBO
viscose process
constitution
quenching
21. Number of repeat/structural units in a polymer chain
die
degree of polymerization DPn
acrylic
side groups/ substituents
22. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
spinneret
freeze line
polymethylmethacrylate PMMA
oligomers
23. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
functional groups
secondary bonding
polyviyl chloride PVC
24. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
isotactic dan
screen pack
addition polymerization/chain growth/free- radical polymerization
oligomers
25. 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
melt spinning
weight average molecular weight Mw
branching
syndiotactic dyad
26. Polymer made up of two of more differenet monomers covalently bonded together
dyes
copolymer
secondary bonding
High volume thermoplastics HVTP
27. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
additives
syndiotactic dyad
High volume thermoplastics HVTP
relative molecular mass RMM
28. 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
quenching
glass transition temperature Tg
aramid
plasticizers
29. Covalent bonding of the polymer backbone and side groups
thermosets
barrel
primary bonding
end groups
30. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
aramid
polyamides
shot size
conformation
31. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
tow
side groups/ substituents
polyamides
end groups
32. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
side groups/ substituents
atactic
configuration
condensation/step- growth polymerization
33. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
hopper
polypphenylene terephyhalamide PPTA
extruder
branching
34. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
step- growth/condensation polymerization
secondary bonding
graft copolymers
primary termination
35. Broad category of polymers that includes polymers containing urethane linkages
degree of polymerization DPn
polyurethanes
graft copolymers
viscose process
36. Atoms attached to the polymer backbone.
solution spinning
quenching
mutual termination
side groups/ substituents
37. Smallest repeating unit in a polymer. aka repeat unit
aramid
most common condensation/step- growth polymerization occur between....
block copolymers
structural unit
38. Number of bonds a molecule has formed
elastomers
functionality
petroleum
plasticizers
39. 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
vulcanization
polyesters
gauche conformation
plasticizers
40. Polymers that contain amide (- N-) groups in the chain
initiation
polyamides
shot size
copolymer
41. Pigments or dyes that change the way light is absorbed or reflected by a polymer
coloring agents
conformation
hopper
primary bonding
42. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
die
aramid
additives
random copolymers
43. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
viscose process
fillers
end groups
secondary bonding
44. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
coloring agents
monomers
initiation
45. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
quenching
plasticizers
injection molding
solution spinning
46. 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
barrel
fillers
poly- p- phenylene benzobisoxazole PBO
number average molecular weight Mn
47. 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
block copolymers
shot size
homopolymer
relative molecular mass RMM
48. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
vinyl monomer
functionality
addition polymerization/chain growth/free- radical polymerization
rayon
49. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
aramid
asymetric
stabilizers
50. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
polyviyl chloride PVC
gauche conformation
shot size