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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 contain amide (- N-) groups in the chain
polyamides
polyurethanes
constitution
side groups/ substituents
2. 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
hopper
relative molecular mass RMM
polypphenylene terephyhalamide PPTA
additives
3. Primary raw material for most polymers
primary bonding
staggered conformation
petroleum
side groups/ substituents
4. Molecule containing a highly reactive unpaired electron
asymetric
step- growth/condensation polymerization
vinyl monomer
free radical
5. 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
number average molecular weight Mn
primary termination
functional groups
6. Conformation that occurs when the largest substituent in a molecule are offset by 60
glass transition temperature Tg
gauche conformation
injection molding
propagation
7. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
asymetric
atactic
isotactic dan
thermoplastics
8. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
gauche conformation
oligomers
thermoplastics
syndiotactic dyad
9. Porcess of breaking large organic hydrocarbons into smaller molecules
solution spinning
acrylic
copolymer
cracking
10. Double bounded organic molecule used to begin addition polymerization
alternating copolymers
configuration
glass transition temperature Tg
vinyl monomer
11. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
condensation/step- growth polymerization
most common condensation/step- growth polymerization occur between....
polypphenylene terephyhalamide PPTA
mutual termination
12. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
end groups
viscose process
High volume thermoplastics HVTP
13. Polymer made up of two of more differenet monomers covalently bonded together
extruder
plasticizers
copolymer
rayon
14. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
free radical
fillers
configuration
melt spinning
15. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
polymethylmethacrylate PMMA
aramid
asymetric
High volume thermoplastics HVTP
16. 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
dyes
poly- p- phenylene benzobisoxazole PBO
glass transition temperature Tg
barrel
17. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
rayon
gauche conformation
petroleum
alternating copolymers
18. 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
glass transition temperature Tg
polyurethanes
weight average molecular weight Mw
polymer backbone
19. 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
polyurethanes
conformation
acrylic
mutual termination
20. Relative configuration of adjecent asymmetric carbons
propagation
eclipsed conformation/ cis - conformation
tacticity
shot size
21. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
coloring agents
polymer backbone
dyes
screen pack
22. Pigments or dyes that change the way light is absorbed or reflected by a polymer
initiation
coloring agents
homopolymer
polymers
23. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
plyacrylonitrile PAN
polyesters
freeze line
plasticizers
24. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
blends
graft copolymers
functional groups
number average molecular weight Mn
25. 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
number average molecular weight Mn
isotactic dan
trans - conformation
polyesters
26. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
conformation
vulcanization
plasticizers
functional groups
27. 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
spinneret
polyurethanes
extruder
die
28. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
secondary bonding
poly- p- phenylene benzobisoxazole PBO
hopper
plyacrylonitrile PAN
29. 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
asymetric
polyviyl chloride PVC
initiation
block copolymers
30. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
trans - conformation
mutual termination
poly- p- phenylene benzobisoxazole PBO
constitution
31. 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
fillers
homopolymer
branching
weight average molecular weight Mw
32. Low- molecular- weight building blocks repeated in the polymer chain
petroleum
screen pack
monomers
asymetric
33. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
structural unit
melt spinning
condensation/step- growth polymerization
oligomers
34. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
termination
polyviyl chloride PVC
acrylic
solution spinning
35. Covalent bonding of the polymer backbone and side groups
primary bonding
constitution
melt spinning
trans - conformation
36. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
polyviyl chloride PVC
weight average molecular weight Mw
cracking
constitution
37. Carbon atom capable of multiple configurations due to four different substituents
staggered conformation
mutual termination
asymetric
configuration
38. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
screen pack
vulcanization
polymethylmethacrylate PMMA
39. 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
conformation
fillers
melt spinning
plasticizers
40. Simple polymeric material produced as pellets in large quantities
termination
High volume thermoplastics HVTP
step- growth/condensation polymerization
any carbon with double bonds or repeated substituents
41. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
viscose process
poly- p- phenylene benzobisoxazole PBO
High volume thermoplastics HVTP
42. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
melt spinning
polyamides
extruder
43. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
barrel
shot size
relative molecular mass RMM
initiation
44. Coloring agents that do not dissolve into the polymer
staggered conformation
vulcanization
pigments
plyacrylonitrile PAN
45. First step in the process of polymerization - during which a free radical is formed
termination
viscose process
initiation
dyes
46. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
polymers
solution spinning
mutual termination
thermosets
47. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
cracking
polyviyl chloride PVC
additives
48. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
functionality
additives
weight average molecular weight Mw
barrel
49. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
isotactic dan
step- growth/condensation polymerization
tacticity
50. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
plasticizers
plasticizers
stabilizers
most common condensation/step- growth polymerization occur between....