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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. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
polymethylmethacrylate PMMA
oligomers
hopper
blends
2. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
freeze line
number average molecular weight Mn
tow
polyamides
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
aramid
atactic
melt spinning
polyviyl chloride PVC
4. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
functional groups
atactic
vinyl monomer
additives
5. Polymer made up of two of more differenet monomers covalently bonded together
polyamides
quenching
copolymer
monomers
6. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
step- growth/condensation polymerization
freeze line
oligomers
asymetric
7. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
structural unit
stabilizers
syndiotactic dyad
8. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
oligomers
glass transition temperature Tg
constitution
addition polymerization/chain growth/free- radical polymerization
9. Simple polymeric material produced as pellets in large quantities
polyviyl chloride PVC
functionality
High volume thermoplastics HVTP
gauche conformation
10. 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
poly- p- phenylene benzobisoxazole PBO
freeze line
relative molecular mass RMM
melt spinning
11. 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
freeze line
polyurethanes
rayon
12. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
free radical
thermoplastics
atactic
13. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
coloring agents
vulcanization
screen pack
monomers
14. Low- molecular- weight building blocks repeated in the polymer chain
fillers
asymetric
monomers
staggered conformation
15. 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
copolymer
configuration
vinyl monomer
step- growth/condensation polymerization
16. First step in the process of polymerization - during which a free radical is formed
initiation
glass transition temperature Tg
side groups/ substituents
branching
17. 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
weight average molecular weight Mw
configuration
vulcanization
die
18. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
configuration
polymer backbone
elastomers
structural unit
19. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
coloring agents
rayon
random copolymers
extruder
20. Two or more polymers mechanically mixed together but without covalent bonding between them
relative molecular mass RMM
thermoplastics
oligomers
blends
21. 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
plasticizers
block copolymers
spinneret
hopper
22. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
pigments
conformation
quenching
coloring agents
23. Covalently bonded chains of molecules with small monomer units repeated from end to end
primary termination
polymers
side groups/ substituents
polymethylmethacrylate PMMA
24. Porcess of breaking large organic hydrocarbons into smaller molecules
gauche conformation
acrylic
cracking
structural unit
25. Covalent bonding of the polymer backbone and side groups
functionality
screen pack
primary bonding
polyamides
26. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
shot size
atactic
functionality
27. 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
weight average molecular weight Mw
gauche conformation
petroleum
hopper
28. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
staggered conformation
hopper
dyes
glass transition temperature Tg
29. 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
vinyl monomer
solution spinning
condensation/step- growth polymerization
stabilizers
30. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
mutual termination
aramid
poly- p- phenylene benzobisoxazole PBO
step- growth/condensation polymerization
31. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
monomers
degree of polymerization DPn
graft copolymers
hopper
32. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
tacticity
constitution
secondary bonding
33. Arrangement of the largest substituents where the substituets are offset by 120
pigments
staggered conformation
acrylic
solution spinning
34. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
side groups/ substituents
elastomers
end groups
35. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
random copolymers
screen pack
thermoplastics
dyes
36. Pigments or dyes that change the way light is absorbed or reflected by a polymer
monomers
oligomers
coloring agents
initiation
37. Conformation in which the largest substituents are offset by 180
tacticity
extruder
polyesters
trans - conformation
38. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
primary termination
tacticity
poly- p- phenylene benzobisoxazole PBO
elastomers
39. Additives whose primary purpose is to reduce the final cost of the product
conformation
fillers
termination
High volume thermoplastics HVTP
40. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
oligomers
staggered conformation
polypphenylene terephyhalamide PPTA
condensation/step- growth polymerization
41. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
coloring agents
oligomers
glass transition temperature Tg
thermosets
42. Coloring agents that do not dissolve into the polymer
pigments
screen pack
weight average molecular weight Mw
alternating copolymers
43. Double bounded organic molecule used to begin addition polymerization
staggered conformation
configuration
poly- p- phenylene benzobisoxazole PBO
vinyl monomer
44. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
quenching
free radical
termination
45. Molecule containing a highly reactive unpaired electron
pigments
nylon
free radical
constitution
46. Broad category of polymers that includes polymers containing urethane linkages
aramid
polyurethanes
poly- p- phenylene benzobisoxazole PBO
addition polymerization/chain growth/free- radical polymerization
47. Number of repeat/structural units in a polymer chain
spinneret
degree of polymerization DPn
polyurethanes
screen pack
48. 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
isotactic dan
stabilizers
extruder
mutual termination
49. 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
polypphenylene terephyhalamide PPTA
block copolymers
number average molecular weight Mn
cracking
50. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
plyacrylonitrile PAN
vinyl monomer
aramid
quenching