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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. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
syndiotactic dyad
asymetric
polymers
side groups/ substituents
2. Polymer that is made up a single repeat unit
quenching
structural unit
block copolymers
homopolymer
3. Atoms attached to the polymer backbone.
side groups/ substituents
random copolymers
viscose process
barrel
4. 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
rayon
free radical
barrel
polymers
5. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
melt spinning
poly- p- phenylene benzobisoxazole PBO
addition polymerization/chain growth/free- radical polymerization
6. Molecule containing a highly reactive unpaired electron
syndiotactic dyad
solution spinning
elastomers
free radical
7. Covalently bonded chains of molecules with small monomer units repeated from end to end
alternating copolymers
polymers
elastomers
gauche conformation
8. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
extruder
trans - conformation
nylon
gauche conformation
9. Low- molecular- weight building blocks repeated in the polymer chain
polymers
monomers
vinyl monomer
glass transition temperature Tg
10. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
pigments
elastomers
plyacrylonitrile PAN
monomers
11. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
condensation/step- growth polymerization
atactic
extruder
plyacrylonitrile PAN
12. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
additives
monomers
functional groups
acrylic
13. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
graft copolymers
vulcanization
isotactic dan
shot size
14. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
plasticizers
spinneret
polyurethanes
polyamides
15. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
conformation
die
weight average molecular weight Mw
aramid
16. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
mutual termination
number average molecular weight Mn
monomers
polyviyl chloride PVC
17. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
die
constitution
degree of polymerization DPn
mutual termination
18. 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
asymetric
mutual termination
termination
solution spinning
19. 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
functionality
constitution
monomers
20. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
polymethylmethacrylate PMMA
initiation
polyviyl chloride PVC
tow
21. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
end groups
staggered conformation
dyes
stabilizers
22. 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
degree of polymerization DPn
viscose process
glass transition temperature Tg
rayon
23. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
propagation
oligomers
acrylic
conformation
24. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
elastomers
hopper
addition polymerization/chain growth/free- radical polymerization
viscose process
25. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
spinneret
injection molding
polyviyl chloride PVC
polymers
26. 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
block copolymers
mutual termination
plasticizers
spinneret
27. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
graft copolymers
plasticizers
secondary bonding
screen pack
28. Polymer made up of two of more differenet monomers covalently bonded together
side groups/ substituents
fillers
copolymer
thermosets
29. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
copolymer
atactic
step- growth/condensation polymerization
primary termination
30. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
viscose process
trans - conformation
High volume thermoplastics HVTP
31. First step in the process of polymerization - during which a free radical is formed
addition polymerization/chain growth/free- radical polymerization
injection molding
stabilizers
initiation
32. 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
atactic
primary bonding
number average molecular weight Mn
alternating copolymers
33. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polymethylmethacrylate PMMA
plasticizers
spinneret
alternating copolymers
34. 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
monomers
polymer backbone
relative molecular mass RMM
isotactic dan
35. Arrangement of the largest substituents where the substituets are offset by 120
staggered conformation
polypphenylene terephyhalamide PPTA
injection molding
polymers
36. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
oligomers
screen pack
atactic
37. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
end groups
number average molecular weight Mn
propagation
vinyl monomer
38. 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
hopper
branching
weight average molecular weight Mw
polypphenylene terephyhalamide PPTA
39. Polymers that contain amide (- N-) groups in the chain
asymetric
polymers
spinneret
polyamides
40. Additives whose primary purpose is to reduce the final cost of the product
fillers
vinyl monomer
mutual termination
hopper
41. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
vulcanization
polymer backbone
mutual termination
42. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
polymer backbone
constitution
graft copolymers
structural unit
43. Number of repeat/structural units in a polymer chain
random copolymers
primary bonding
graft copolymers
degree of polymerization DPn
44. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
propagation
structural unit
injection molding
rayon
45. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
number average molecular weight Mn
configuration
homopolymer
functional groups
46. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
polyviyl chloride PVC
petroleum
viscose process
47. Carbon atom capable of multiple configurations due to four different substituents
melt spinning
asymetric
coloring agents
any carbon with double bonds or repeated substituents
48. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
oligomers
screen pack
viscose process
eclipsed conformation/ cis - conformation
49. An acid and an alcohol
spinneret
plasticizers
additives
most common condensation/step- growth polymerization occur between....
50. Pigments or dyes that change the way light is absorbed or reflected by a polymer
coloring agents
homopolymer
random copolymers
graft copolymers