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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. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
hopper
polymer backbone
trans - conformation
blends
2. Molecule containing a highly reactive unpaired electron
isotactic dan
injection molding
High volume thermoplastics HVTP
free radical
3. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
High volume thermoplastics HVTP
polyurethanes
viscose process
polypphenylene terephyhalamide PPTA
4. 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
block copolymers
number average molecular weight Mn
shot size
vulcanization
5. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
polyviyl chloride PVC
gauche conformation
trans - conformation
6. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
poly- p- phenylene benzobisoxazole PBO
free radical
atactic
secondary bonding
7. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
solution spinning
alternating copolymers
functional groups
polyviyl chloride PVC
8. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
termination
branching
eclipsed conformation/ cis - conformation
glass transition temperature Tg
9. 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
branching
polyviyl chloride PVC
additives
plasticizers
10. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
polymethylmethacrylate PMMA
asymetric
cracking
11. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
aramid
random copolymers
freeze line
screen pack
12. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
propagation
screen pack
any carbon with double bonds or repeated substituents
most common condensation/step- growth polymerization occur between....
13. Number of bonds a molecule has formed
primary termination
functionality
stabilizers
primary bonding
14. 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
thermosets
random copolymers
rayon
15. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
secondary bonding
termination
addition polymerization/chain growth/free- radical polymerization
16. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
block copolymers
relative molecular mass RMM
free radical
17. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
nylon
primary termination
glass transition temperature Tg
polyviyl chloride PVC
18. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
elastomers
polyurethanes
freeze line
blends
19. Softening agents
primary bonding
viscose process
weight average molecular weight Mw
plasticizers
20. 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
thermoplastics
freeze line
functionality
mutual termination
21. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
screen pack
thermosets
die
22. Low- molecular- weight building blocks repeated in the polymer chain
stabilizers
monomers
additives
termination
23. Arrangement of the largest substituents where the substituets are offset by 120
isotactic dan
nylon
staggered conformation
oligomers
24. 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
branching
polypphenylene terephyhalamide PPTA
graft copolymers
barrel
25. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
initiation
syndiotactic dyad
screen pack
thermoplastics
26. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
configuration
structural unit
primary termination
27. Conformation in which the largest substituents are offset by 180
side groups/ substituents
polyviyl chloride PVC
polymers
trans - conformation
28. Covalently bonded chains of molecules with small monomer units repeated from end to end
hopper
alternating copolymers
polyviyl chloride PVC
polymers
29. Conformation that occurs when the largest substituent in a molecule are offset by 60
freeze line
thermoplastics
staggered conformation
gauche conformation
30. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
die
freeze line
screen pack
termination
31. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
termination
pigments
block copolymers
32. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
pigments
glass transition temperature Tg
side groups/ substituents
33. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
staggered conformation
die
free radical
conformation
34. 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
tow
cracking
relative molecular mass RMM
step- growth/condensation polymerization
35. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
degree of polymerization DPn
free radical
secondary bonding
36. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
polyurethanes
any carbon with double bonds or repeated substituents
screen pack
tacticity
37. 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
thermosets
aramid
38. Porcess of breaking large organic hydrocarbons into smaller molecules
number average molecular weight Mn
step- growth/condensation polymerization
cracking
shot size
39. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
extruder
thermoplastics
trans - conformation
40. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
coloring agents
step- growth/condensation polymerization
block copolymers
poly- p- phenylene benzobisoxazole PBO
41. Primary raw material for most polymers
side groups/ substituents
petroleum
tacticity
polyamides
42. Simple polymeric material produced as pellets in large quantities
glass transition temperature Tg
petroleum
High volume thermoplastics HVTP
isotactic dan
43. 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
barrel
polyamides
secondary bonding
weight average molecular weight Mw
44. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
any carbon with double bonds or repeated substituents
coloring agents
addition polymerization/chain growth/free- radical polymerization
alternating copolymers
45. Coloring agents that do not dissolve into the polymer
thermoplastics
plyacrylonitrile PAN
pigments
isotactic dan
46. Atoms attached to the polymer backbone.
condensation/step- growth polymerization
acrylic
conformation
side groups/ substituents
47. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
initiation
melt spinning
tow
shot size
48. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
polymers
functional groups
homopolymer
49. Carbon atom capable of multiple configurations due to four different substituents
asymetric
High volume thermoplastics HVTP
structural unit
condensation/step- growth polymerization
50. Covalent bonding of the polymer backbone and side groups
primary bonding
extruder
plasticizers
initiation