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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. Formation of a plymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chains. this reaction also forms a biproduct - usually water
thermosets
nylon
cracking
condensation/step- growth polymerization
2. 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
polyurethanes
polyviyl chloride PVC
pigments
die
3. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
melt spinning
blends
spinneret
4. 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
initiation
additives
structural unit
isotactic dan
5. 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
end groups
free radical
die
6. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
mutual termination
polyamides
eclipsed conformation/ cis - conformation
secondary bonding
7. 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
relative molecular mass RMM
step- growth/condensation polymerization
stabilizers
secondary bonding
8. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
primary termination
number average molecular weight Mn
vinyl monomer
shot size
9. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
vulcanization
syndiotactic dyad
secondary bonding
petroleum
10. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
die
addition polymerization/chain growth/free- radical polymerization
end groups
most common condensation/step- growth polymerization occur between....
11. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
atactic
conformation
thermosets
eclipsed conformation/ cis - conformation
12. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
elastomers
any carbon with double bonds or repeated substituents
tacticity
conformation
13. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
stabilizers
termination
asymetric
alternating copolymers
14. Covalent bonding of the polymer backbone and side groups
conformation
primary bonding
graft copolymers
petroleum
15. Molecule containing a highly reactive unpaired electron
elastomers
free radical
poly- p- phenylene benzobisoxazole PBO
addition polymerization/chain growth/free- radical polymerization
16. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
random copolymers
shot size
polyamides
graft copolymers
17. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
extruder
free radical
branching
glass transition temperature Tg
18. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
hopper
addition polymerization/chain growth/free- radical polymerization
graft copolymers
pigments
19. Pigments or dyes that change the way light is absorbed or reflected by a polymer
initiation
coloring agents
polyurethanes
polymer backbone
20. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
polyviyl chloride PVC
viscose process
syndiotactic dyad
polymers
21. Softening agents
homopolymer
plasticizers
High volume thermoplastics HVTP
cracking
22. 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
relative molecular mass RMM
number average molecular weight Mn
asymetric
random copolymers
23. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
propagation
solution spinning
die
thermoplastics
24. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
thermosets
freeze line
number average molecular weight Mn
free radical
25. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
tow
polypphenylene terephyhalamide PPTA
weight average molecular weight Mw
constitution
26. One type of polymer that contains at least 85% of polyacrylonitrile PAN
copolymer
acrylic
polymethylmethacrylate PMMA
syndiotactic dyad
27. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
additives
thermosets
stabilizers
28. Polymer that is made up a single repeat unit
barrel
homopolymer
primary termination
rayon
29. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
initiation
secondary bonding
eclipsed conformation/ cis - conformation
poly- p- phenylene benzobisoxazole PBO
30. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
barrel
copolymer
random copolymers
graft copolymers
31. 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
oligomers
rayon
vulcanization
polyesters
32. 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
polyurethanes
end groups
condensation/step- growth polymerization
33. Carbon atom capable of multiple configurations due to four different substituents
freeze line
polyurethanes
asymetric
shot size
34. Simple polymeric material produced as pellets in large quantities
degree of polymerization DPn
coloring agents
High volume thermoplastics HVTP
polyesters
35. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
coloring agents
acrylic
constitution
conformation
36. Number of repeat/structural units in a polymer chain
homopolymer
random copolymers
degree of polymerization DPn
eclipsed conformation/ cis - conformation
37. Arrangement of the largest substituents where the substituets are offset by 120
constitution
quenching
solution spinning
staggered conformation
38. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
addition polymerization/chain growth/free- radical polymerization
termination
stabilizers
polymer backbone
39. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
addition polymerization/chain growth/free- radical polymerization
nylon
eclipsed conformation/ cis - conformation
polyurethanes
40. 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
fillers
barrel
functionality
shot size
41. Conformation in which the largest substituents are offset by 180
tacticity
number average molecular weight Mn
dyes
trans - conformation
42. Additives whose primary purpose is to reduce the final cost of the product
step- growth/condensation polymerization
nylon
fillers
any carbon with double bonds or repeated substituents
43. Polymers that contain amide (- N-) groups in the chain
extruder
polyamides
tacticity
spinneret
44. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
any carbon with double bonds or repeated substituents
number average molecular weight Mn
injection molding
dyes
45. Primary raw material for most polymers
stabilizers
additives
gauche conformation
petroleum
46. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
nylon
injection molding
end groups
addition polymerization/chain growth/free- radical polymerization
47. Double bounded organic molecule used to begin addition polymerization
alternating copolymers
fillers
vinyl monomer
polyamides
48. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
functional groups
polyesters
secondary bonding
random copolymers
49. First step in the process of polymerization - during which a free radical is formed
side groups/ substituents
melt spinning
solution spinning
initiation
50. Broad category of polymers that includes polymers containing urethane linkages
asymetric
staggered conformation
polyurethanes
conformation