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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. Number of repeat/structural units in a polymer chain
fillers
acrylic
degree of polymerization DPn
shot size
2. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
condensation/step- growth polymerization
primary bonding
polyviyl chloride PVC
tacticity
3. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
poly- p- phenylene benzobisoxazole PBO
polyurethanes
branching
4. Covalent bonding of the polymer backbone and side groups
tacticity
staggered conformation
injection molding
primary bonding
5. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
polyamides
hopper
degree of polymerization DPn
thermoplastics
6. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
additives
dyes
screen pack
solution spinning
7. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
initiation
oligomers
acrylic
conformation
8. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
solution spinning
number average molecular weight Mn
polyamides
primary termination
9. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
constitution
addition polymerization/chain growth/free- radical polymerization
number average molecular weight Mn
High volume thermoplastics HVTP
10. 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
stabilizers
weight average molecular weight Mw
most common condensation/step- growth polymerization occur between....
11. 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
viscose process
copolymer
number average molecular weight Mn
end groups
12. Low- molecular- weight building blocks repeated in the polymer chain
shot size
monomers
staggered conformation
polyamides
13. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
graft copolymers
quenching
oligomers
most common condensation/step- growth polymerization occur between....
14. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
most common condensation/step- growth polymerization occur between....
additives
acrylic
High volume thermoplastics HVTP
15. Atoms attached to the polymer backbone.
block copolymers
coloring agents
side groups/ substituents
acrylic
16. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
weight average molecular weight Mw
atactic
spinneret
17. Softening agents
oligomers
plasticizers
trans - conformation
block copolymers
18. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
polyamides
plyacrylonitrile PAN
graft copolymers
tow
19. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
thermosets
primary termination
monomers
polymer backbone
20. 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
polyurethanes
tacticity
branching
atactic
21. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
syndiotactic dyad
termination
rayon
any carbon with double bonds or repeated substituents
22. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
eclipsed conformation/ cis - conformation
vinyl monomer
shot size
23. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymethylmethacrylate PMMA
functionality
polymers
polyviyl chloride PVC
24. 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
step- growth/condensation polymerization
thermoplastics
relative molecular mass RMM
petroleum
25. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
eclipsed conformation/ cis - conformation
stabilizers
injection molding
block copolymers
26. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
number average molecular weight Mn
polyurethanes
mutual termination
thermoplastics
27. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
freeze line
poly- p- phenylene benzobisoxazole PBO
fillers
viscose process
28. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
melt spinning
propagation
trans - conformation
polymethylmethacrylate PMMA
29. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
primary bonding
eclipsed conformation/ cis - conformation
hopper
thermoplastics
30. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
shot size
extruder
melt spinning
free radical
31. Conformation that occurs when the largest substituent in a molecule are offset by 60
vulcanization
end groups
gauche conformation
barrel
32. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
pigments
nylon
viscose process
hopper
33. Relative configuration of adjecent asymmetric carbons
polypphenylene terephyhalamide PPTA
tacticity
homopolymer
termination
34. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
polyviyl chloride PVC
functional groups
alternating copolymers
35. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
most common condensation/step- growth polymerization occur between....
atactic
stabilizers
copolymer
36. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
tow
secondary bonding
thermoplastics
cracking
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
conformation
barrel
polymers
staggered conformation
38. Conformation in which the largest substituents are offset by 180
quenching
trans - conformation
staggered conformation
primary bonding
39. Pigments or dyes that change the way light is absorbed or reflected by a polymer
freeze line
viscose process
random copolymers
coloring agents
40. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
graft copolymers
staggered conformation
polyviyl chloride PVC
41. 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
tow
weight average molecular weight Mw
shot size
hopper
42. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
thermosets
degree of polymerization DPn
termination
addition polymerization/chain growth/free- radical polymerization
43. Coloring agents that do not dissolve into the polymer
fillers
nylon
secondary bonding
pigments
44. Double bounded organic molecule used to begin addition polymerization
primary termination
staggered conformation
vinyl monomer
tow
45. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
alternating copolymers
tow
copolymer
barrel
46. 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
polypphenylene terephyhalamide PPTA
plasticizers
asymetric
47. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
injection molding
homopolymer
aramid
pigments
48. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
primary termination
polyurethanes
quenching
shot size
49. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
number average molecular weight Mn
acrylic
blends
addition polymerization/chain growth/free- radical polymerization
50. 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
tacticity
aramid
shot size
polyesters