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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
die
polyamides
weight average molecular weight Mw
branching
2. 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
injection molding
graft copolymers
step- growth/condensation polymerization
monomers
3. Polymer made up of two of more differenet monomers covalently bonded together
initiation
homopolymer
copolymer
polyamides
4. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
cracking
asymetric
atactic
5. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
functionality
spinneret
side groups/ substituents
6. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
branching
nylon
structural unit
7. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
additives
vinyl monomer
branching
tow
8. Covalent bonding of the polymer backbone and side groups
primary bonding
end groups
polymers
High volume thermoplastics HVTP
9. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
plyacrylonitrile PAN
nylon
plasticizers
viscose process
10. Number of bonds a molecule has formed
functionality
eclipsed conformation/ cis - conformation
number average molecular weight Mn
oligomers
11. Smallest repeating unit in a polymer. aka repeat unit
trans - conformation
relative molecular mass RMM
viscose process
structural unit
12. 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
copolymer
glass transition temperature Tg
nylon
block copolymers
13. 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
elastomers
barrel
die
polyamides
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
additives
cracking
isotactic dan
tow
15. Two or more polymers mechanically mixed together but without covalent bonding between them
shot size
polyesters
blends
melt spinning
16. Conformation that occurs when the largest substituent in a molecule are offset by 60
side groups/ substituents
homopolymer
gauche conformation
constitution
17. 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
aramid
secondary bonding
eclipsed conformation/ cis - conformation
18. 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
isotactic dan
termination
conformation
block copolymers
19. 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
plasticizers
atactic
melt spinning
vinyl monomer
20. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
degree of polymerization DPn
polymer backbone
spinneret
21. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
initiation
cracking
rayon
tacticity
22. Atoms attached to the polymer backbone.
barrel
plyacrylonitrile PAN
block copolymers
side groups/ substituents
23. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
atactic
freeze line
polymers
24. Coloring agents that do not dissolve into the polymer
pigments
graft copolymers
extruder
any carbon with double bonds or repeated substituents
25. Primary raw material for most polymers
functional groups
alternating copolymers
propagation
petroleum
26. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
side groups/ substituents
plasticizers
gauche conformation
hopper
27. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
weight average molecular weight Mw
injection molding
die
graft copolymers
28. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
branching
configuration
polymer backbone
rayon
29. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
weight average molecular weight Mw
secondary bonding
stabilizers
fillers
30. 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
configuration
rayon
relative molecular mass RMM
conformation
31. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
plyacrylonitrile PAN
addition polymerization/chain growth/free- radical polymerization
glass transition temperature Tg
gauche conformation
32. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
condensation/step- growth polymerization
graft copolymers
dyes
rayon
33. 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
primary bonding
nylon
branching
side groups/ substituents
34. Molecule containing a highly reactive unpaired electron
polyamides
polyurethanes
free radical
viscose process
35. Broad category of polymers that includes polymers containing urethane linkages
homopolymer
thermoplastics
polyurethanes
viscose process
36. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
extruder
functional groups
staggered conformation
alternating copolymers
37. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
die
screen pack
plyacrylonitrile PAN
polymethylmethacrylate PMMA
38. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
poly- p- phenylene benzobisoxazole PBO
injection molding
relative molecular mass RMM
side groups/ substituents
39. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
propagation
conformation
staggered conformation
spinneret
40. 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
die
number average molecular weight Mn
tacticity
initiation
41. Softening agents
free radical
plasticizers
screen pack
functional groups
42. Low- molecular- weight building blocks repeated in the polymer chain
monomers
primary termination
degree of polymerization DPn
primary bonding
43. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
thermoplastics
polymethylmethacrylate PMMA
polyviyl chloride PVC
hopper
44. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermosets
rayon
any carbon with double bonds or repeated substituents
staggered conformation
45. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
step- growth/condensation polymerization
eclipsed conformation/ cis - conformation
alternating copolymers
shot size
46. 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
termination
vinyl monomer
functionality
die
47. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
elastomers
isotactic dan
acrylic
48. Arrangement of the largest substituents where the substituets are offset by 120
thermosets
shot size
weight average molecular weight Mw
staggered conformation
49. Pigments or dyes that change the way light is absorbed or reflected by a polymer
tacticity
plasticizers
coloring agents
thermoplastics
50. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
polyesters
barrel
elastomers
petroleum