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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. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymer backbone
structural unit
dyes
condensation/step- growth polymerization
2. First step in the process of polymerization - during which a free radical is formed
any carbon with double bonds or repeated substituents
initiation
elastomers
weight average molecular weight Mw
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
propagation
aramid
branching
additives
4. 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
plyacrylonitrile PAN
mutual termination
High volume thermoplastics HVTP
elastomers
5. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
configuration
propagation
quenching
gauche conformation
6. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
secondary bonding
screen pack
primary termination
poly- p- phenylene benzobisoxazole PBO
7. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
extruder
stabilizers
freeze line
polymer backbone
8. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
aramid
constitution
rayon
additives
9. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
staggered conformation
thermoplastics
plasticizers
stabilizers
10. 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
aramid
addition polymerization/chain growth/free- radical polymerization
primary termination
11. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
vulcanization
staggered conformation
random copolymers
plyacrylonitrile PAN
12. Double bounded organic molecule used to begin addition polymerization
number average molecular weight Mn
structural unit
vinyl monomer
oligomers
13. Polymer that is made up a single repeat unit
homopolymer
secondary bonding
weight average molecular weight Mw
thermoplastics
14. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
plasticizers
vulcanization
glass transition temperature Tg
primary bonding
15. 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
rayon
glass transition temperature Tg
stabilizers
petroleum
16. Softening agents
thermoplastics
extruder
plasticizers
primary termination
17. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
degree of polymerization DPn
polymer backbone
branching
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
plasticizers
copolymer
number average molecular weight Mn
plasticizers
19. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
quenching
random copolymers
configuration
stabilizers
20. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermosets
die
polymers
poly- p- phenylene benzobisoxazole PBO
21. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
primary bonding
configuration
initiation
additives
22. Covalent bonding of the polymer backbone and side groups
primary bonding
quenching
glass transition temperature Tg
shot size
23. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
pigments
thermoplastics
alternating copolymers
24. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
homopolymer
acrylic
injection molding
poly- p- phenylene benzobisoxazole PBO
25. 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
functional groups
condensation/step- growth polymerization
atactic
polymethylmethacrylate PMMA
26. Simple polymeric material produced as pellets in large quantities
screen pack
vinyl monomer
functionality
High volume thermoplastics HVTP
27. Two or more polymers mechanically mixed together but without covalent bonding between them
asymetric
shot size
polyurethanes
blends
28. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
configuration
alternating copolymers
spinneret
High volume thermoplastics HVTP
29. 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
poly- p- phenylene benzobisoxazole PBO
branching
termination
barrel
30. Number of bonds a molecule has formed
block copolymers
quenching
functionality
injection molding
31. Low- molecular- weight building blocks repeated in the polymer chain
monomers
end groups
thermoplastics
die
32. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
number average molecular weight Mn
eclipsed conformation/ cis - conformation
spinneret
hopper
33. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
termination
nylon
blends
most common condensation/step- growth polymerization occur between....
34. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
end groups
graft copolymers
plasticizers
hopper
35. Primary raw material for most polymers
petroleum
random copolymers
plasticizers
polyviyl chloride PVC
36. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
extruder
relative molecular mass RMM
viscose process
petroleum
37. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
polymer backbone
monomers
shot size
38. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
stabilizers
oligomers
viscose process
39. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
weight average molecular weight Mw
coloring agents
petroleum
40. Porcess of breaking large organic hydrocarbons into smaller molecules
fillers
plasticizers
cracking
constitution
41. Pigments or dyes that change the way light is absorbed or reflected by a polymer
tacticity
polypphenylene terephyhalamide PPTA
conformation
coloring agents
42. Additives whose primary purpose is to reduce the final cost of the product
degree of polymerization DPn
most common condensation/step- growth polymerization occur between....
fillers
propagation
43. 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
polypphenylene terephyhalamide PPTA
trans - conformation
die
secondary bonding
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
copolymer
staggered conformation
number average molecular weight Mn
isotactic dan
45. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
extruder
tacticity
stabilizers
termination
46. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
isotactic dan
viscose process
blends
polypphenylene terephyhalamide PPTA
47. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
condensation/step- growth polymerization
cracking
propagation
hopper
48. 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
alternating copolymers
fillers
polymer backbone
49. An acid and an alcohol
side groups/ substituents
plyacrylonitrile PAN
mutual termination
most common condensation/step- growth polymerization occur between....
50. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
dyes
syndiotactic dyad
addition polymerization/chain growth/free- radical polymerization
any carbon with double bonds or repeated substituents