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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. 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
cracking
solution spinning
glass transition temperature Tg
initiation
2. Conformation in which the largest substituents are offset by 180
tacticity
primary termination
primary bonding
trans - conformation
3. Low- molecular- weight building blocks repeated in the polymer chain
monomers
polyamides
polymers
functional groups
4. Softening agents
copolymer
plasticizers
coloring agents
trans - conformation
5. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
syndiotactic dyad
polyviyl chloride PVC
plyacrylonitrile PAN
initiation
6. First step in the process of polymerization - during which a free radical is formed
tacticity
initiation
freeze line
spinneret
7. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
polyamides
staggered conformation
end groups
atactic
8. 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
petroleum
polypphenylene terephyhalamide PPTA
weight average molecular weight Mw
any carbon with double bonds or repeated substituents
9. 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
die
homopolymer
plasticizers
free radical
10. Two or more polymers mechanically mixed together but without covalent bonding between them
viscose process
polyurethanes
coloring agents
blends
11. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
degree of polymerization DPn
viscose process
vinyl monomer
12. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
primary termination
thermoplastics
melt spinning
alternating copolymers
13. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
pigments
end groups
hopper
thermoplastics
14. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
polymers
primary termination
copolymer
barrel
15. Pigments or dyes that change the way light is absorbed or reflected by a polymer
coloring agents
asymetric
fillers
structural unit
16. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
functionality
quenching
solution spinning
elastomers
17. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
homopolymer
free radical
conformation
tacticity
18. Relative configuration of adjecent asymmetric carbons
extruder
primary termination
constitution
tacticity
19. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
polymer backbone
initiation
configuration
polyviyl chloride PVC
20. Coloring agents that do not dissolve into the polymer
pigments
injection molding
melt spinning
acrylic
21. Simple polymeric material produced as pellets in large quantities
random copolymers
termination
step- growth/condensation polymerization
High volume thermoplastics HVTP
22. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
step- growth/condensation polymerization
random copolymers
monomers
23. Atoms attached to the polymer backbone.
polyamides
graft copolymers
side groups/ substituents
petroleum
24. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
plasticizers
vinyl monomer
alternating copolymers
25. Arrangement of the largest substituents where the substituets are offset by 120
staggered conformation
thermoplastics
hopper
constitution
26. Smallest repeating unit in a polymer. aka repeat unit
condensation/step- growth polymerization
solution spinning
asymetric
structural unit
27. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
freeze line
polypphenylene terephyhalamide PPTA
isotactic dan
28. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
polymer backbone
propagation
most common condensation/step- growth polymerization occur between....
29. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
polyurethanes
relative molecular mass RMM
random copolymers
polymethylmethacrylate PMMA
30. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
asymetric
spinneret
cracking
propagation
31. Molecule containing a highly reactive unpaired electron
free radical
freeze line
secondary bonding
polymethylmethacrylate PMMA
32. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
degree of polymerization DPn
monomers
polymer backbone
block copolymers
33. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
isotactic dan
propagation
injection molding
34. 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
injection molding
number average molecular weight Mn
plasticizers
isotactic dan
35. 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
fillers
die
asymetric
solution spinning
36. Double bounded organic molecule used to begin addition polymerization
functionality
barrel
vinyl monomer
acrylic
37. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
dyes
additives
aramid
constitution
38. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
polyurethanes
dyes
viscose process
shot size
39. Additives whose primary purpose is to reduce the final cost of the product
petroleum
fillers
asymetric
end groups
40. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
syndiotactic dyad
branching
propagation
41. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
solution spinning
additives
termination
weight average molecular weight Mw
42. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
propagation
staggered conformation
syndiotactic dyad
fillers
43. 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
melt spinning
tow
branching
petroleum
44. 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
hopper
functionality
cracking
step- growth/condensation polymerization
45. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
constitution
die
coloring agents
vulcanization
46. Polymer made up of two of more differenet monomers covalently bonded together
freeze line
copolymer
fillers
alternating copolymers
47. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
glass transition temperature Tg
vinyl monomer
primary termination
rayon
48. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
syndiotactic dyad
functional groups
initiation
49. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
relative molecular mass RMM
polyviyl chloride PVC
poly- p- phenylene benzobisoxazole PBO
additives
50. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
polyurethanes
cracking
stabilizers
shot size
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