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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. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
injection molding
functional groups
tacticity
tow
2. Molecule containing a highly reactive unpaired electron
free radical
asymetric
graft copolymers
relative molecular mass RMM
3. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
random copolymers
additives
polymethylmethacrylate PMMA
eclipsed conformation/ cis - conformation
4. Relative configuration of adjecent asymmetric carbons
free radical
configuration
cracking
tacticity
5. Softening agents
alternating copolymers
staggered conformation
plasticizers
isotactic dan
6. Conformation that occurs when the largest substituent in a molecule are offset by 60
mutual termination
solution spinning
fillers
gauche conformation
7. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
secondary bonding
thermosets
condensation/step- growth polymerization
shot size
8. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
rayon
isotactic dan
screen pack
polymer backbone
9. Arrangement of the largest substituents where the substituets are offset by 120
relative molecular mass RMM
staggered conformation
additives
elastomers
10. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
primary bonding
configuration
melt spinning
hopper
11. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
weight average molecular weight Mw
plasticizers
petroleum
12. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
glass transition temperature Tg
plyacrylonitrile PAN
oligomers
extruder
13. Smallest repeating unit in a polymer. aka repeat unit
polymethylmethacrylate PMMA
structural unit
asymetric
rayon
14. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
syndiotactic dyad
poly- p- phenylene benzobisoxazole PBO
injection molding
spinneret
15. One type of polymer that contains at least 85% of polyacrylonitrile PAN
functional groups
additives
acrylic
polymer backbone
16. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
condensation/step- growth polymerization
graft copolymers
weight average molecular weight Mw
thermoplastics
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
free radical
any carbon with double bonds or repeated substituents
weight average molecular weight Mw
polyesters
18. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
weight average molecular weight Mw
primary bonding
polymethylmethacrylate PMMA
die
19. Number of bonds a molecule has formed
isotactic dan
addition polymerization/chain growth/free- radical polymerization
degree of polymerization DPn
functionality
20. 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
melt spinning
random copolymers
mutual termination
hopper
21. 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
plasticizers
vulcanization
isotactic dan
petroleum
22. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
staggered conformation
alternating copolymers
configuration
functional groups
23. Coloring agents that do not dissolve into the polymer
pigments
branching
primary termination
configuration
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
cracking
branching
mutual termination
freeze line
25. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
monomers
asymetric
quenching
vulcanization
26. 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
relative molecular mass RMM
block copolymers
pigments
primary termination
27. Additives whose primary purpose is to reduce the final cost of the product
alternating copolymers
functionality
plasticizers
fillers
28. Conformation in which the largest substituents are offset by 180
thermoplastics
addition polymerization/chain growth/free- radical polymerization
trans - conformation
polyviyl chloride PVC
29. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
elastomers
gauche conformation
pigments
30. Primary raw material for most polymers
functional groups
fillers
propagation
petroleum
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
number average molecular weight Mn
primary bonding
branching
primary termination
32. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
acrylic
nylon
most common condensation/step- growth polymerization occur between....
vinyl monomer
33. Covalently bonded chains of molecules with small monomer units repeated from end to end
vinyl monomer
polymers
initiation
functionality
34. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
random copolymers
vinyl monomer
condensation/step- growth polymerization
35. 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
homopolymer
functional groups
shot size
condensation/step- growth polymerization
36. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
constitution
poly- p- phenylene benzobisoxazole PBO
plasticizers
conformation
37. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
staggered conformation
degree of polymerization DPn
tacticity
38. Polymers that contain amide (- N-) groups in the chain
relative molecular mass RMM
polyamides
number average molecular weight Mn
plasticizers
39. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
dyes
step- growth/condensation polymerization
hopper
functionality
40. Two or more polymers mechanically mixed together but without covalent bonding between them
polymers
propagation
blends
glass transition temperature Tg
41. 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
nylon
eclipsed conformation/ cis - conformation
polymer backbone
die
42. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
elastomers
asymetric
constitution
secondary bonding
43. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
block copolymers
freeze line
elastomers
secondary bonding
44. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
primary termination
aramid
gauche conformation
45. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
thermoplastics
polymer backbone
relative molecular mass RMM
tow
46. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
melt spinning
side groups/ substituents
end groups
pigments
47. Polymer that is made up a single repeat unit
additives
homopolymer
melt spinning
coloring agents
48. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
barrel
vulcanization
block copolymers
primary bonding
49. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
aramid
termination
syndiotactic dyad
constitution
50. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow
mutual termination
thermosets
pigments
plasticizers