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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 comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
most common condensation/step- growth polymerization occur between....
blends
tacticity
2. Coloring agents that do not dissolve into the polymer
pigments
dyes
polymethylmethacrylate PMMA
blends
3. 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
addition polymerization/chain growth/free- radical polymerization
melt spinning
conformation
plasticizers
4. 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
polyurethanes
melt spinning
weight average molecular weight Mw
pigments
5. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
secondary bonding
eclipsed conformation/ cis - conformation
acrylic
quenching
6. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
step- growth/condensation polymerization
petroleum
thermosets
plasticizers
7. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
homopolymer
isotactic dan
weight average molecular weight Mw
8. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
plyacrylonitrile PAN
step- growth/condensation polymerization
shot size
hopper
9. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
functionality
asymetric
extruder
viscose process
10. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
poly- p- phenylene benzobisoxazole PBO
petroleum
shot size
random copolymers
11. Simple polymeric material produced as pellets in large quantities
free radical
stabilizers
High volume thermoplastics HVTP
homopolymer
12. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
quenching
additives
thermoplastics
gauche conformation
13. Polymers that contain amide (- N-) groups in the chain
plasticizers
polyamides
monomers
number average molecular weight Mn
14. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
staggered conformation
configuration
monomers
15. Double bounded organic molecule used to begin addition polymerization
primary bonding
cracking
homopolymer
vinyl monomer
16. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
random copolymers
configuration
primary termination
17. 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
monomers
fillers
functional groups
mutual termination
18. 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
polypphenylene terephyhalamide PPTA
number average molecular weight Mn
structural unit
gauche conformation
19. Conformation in which the largest substituents are offset by 180
spinneret
trans - conformation
polyesters
barrel
20. Smallest repeating unit in a polymer. aka repeat unit
branching
additives
structural unit
side groups/ substituents
21. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
end groups
random copolymers
weight average molecular weight Mw
hopper
22. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
addition polymerization/chain growth/free- radical polymerization
nylon
freeze line
die
23. Number of bonds a molecule has formed
monomers
additives
propagation
functionality
24. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
polymethylmethacrylate PMMA
eclipsed conformation/ cis - conformation
free radical
aramid
25. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
vulcanization
aramid
graft copolymers
petroleum
26. Broad category of polymers that includes polymers containing urethane linkages
secondary bonding
polyurethanes
shot size
functional groups
27. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
tacticity
functional groups
acrylic
28. 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
barrel
step- growth/condensation polymerization
polyurethanes
tacticity
29. Atoms attached to the polymer backbone.
side groups/ substituents
addition polymerization/chain growth/free- radical polymerization
poly- p- phenylene benzobisoxazole PBO
rayon
30. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
polyesters
tow
aramid
viscose process
31. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
cracking
shot size
polyurethanes
syndiotactic dyad
32. Covalently bonded chains of molecules with small monomer units repeated from end to end
plasticizers
polymers
alternating copolymers
conformation
33. Relative configuration of adjecent asymmetric carbons
coloring agents
tow
fillers
tacticity
34. 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
aramid
screen pack
die
secondary bonding
35. First step in the process of polymerization - during which a free radical is formed
High volume thermoplastics HVTP
shot size
polymers
initiation
36. 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
condensation/step- growth polymerization
vulcanization
isotactic dan
fillers
37. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
most common condensation/step- growth polymerization occur between....
petroleum
branching
38. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
gauche conformation
trans - conformation
mutual termination
eclipsed conformation/ cis - conformation
39. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
number average molecular weight Mn
stabilizers
dyes
degree of polymerization DPn
40. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
propagation
asymetric
polyesters
polymethylmethacrylate PMMA
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
weight average molecular weight Mw
number average molecular weight Mn
any carbon with double bonds or repeated substituents
structural unit
42. 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
relative molecular mass RMM
pigments
oligomers
constitution
43. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
viscose process
melt spinning
screen pack
44. 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
stabilizers
quenching
isotactic dan
termination
45. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
termination
spinneret
configuration
coloring agents
46. Polymer that is made up a single repeat unit
asymetric
structural unit
homopolymer
blends
47. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
vulcanization
thermoplastics
polymer backbone
48. Covalent bonding of the polymer backbone and side groups
primary bonding
isotactic dan
barrel
vulcanization
49. Pigments or dyes that change the way light is absorbed or reflected by a polymer
coloring agents
barrel
structural unit
eclipsed conformation/ cis - conformation
50. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
primary termination
rayon
dyes
primary bonding