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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. 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
degree of polymerization DPn
polyamides
barrel
polypphenylene terephyhalamide PPTA
2. Atoms attached to the polymer backbone.
structural unit
side groups/ substituents
glass transition temperature Tg
syndiotactic dyad
3. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
primary termination
eclipsed conformation/ cis - conformation
polymethylmethacrylate PMMA
homopolymer
4. Relative configuration of adjecent asymmetric carbons
copolymer
polymer backbone
tacticity
acrylic
5. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
functional groups
blends
additives
secondary bonding
6. 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
staggered conformation
polyesters
secondary bonding
melt spinning
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
secondary bonding
staggered conformation
freeze line
coloring agents
8. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
conformation
branching
melt spinning
random copolymers
9. Double bounded organic molecule used to begin addition polymerization
condensation/step- growth polymerization
additives
asymetric
vinyl monomer
10. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
blends
syndiotactic dyad
addition polymerization/chain growth/free- radical polymerization
11. 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
end groups
functional groups
High volume thermoplastics HVTP
mutual termination
12. Porcess of breaking large organic hydrocarbons into smaller molecules
relative molecular mass RMM
acrylic
rayon
cracking
13. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
random copolymers
side groups/ substituents
syndiotactic dyad
primary bonding
14. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
step- growth/condensation polymerization
dyes
pigments
15. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
polymers
step- growth/condensation polymerization
configuration
16. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
plasticizers
graft copolymers
alternating copolymers
isotactic dan
17. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
branching
cracking
free radical
viscose process
18. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
degree of polymerization DPn
trans - conformation
freeze line
configuration
19. Smallest repeating unit in a polymer. aka repeat unit
vulcanization
structural unit
tacticity
High volume thermoplastics HVTP
20. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
random copolymers
cracking
polymer backbone
extruder
21. 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
configuration
melt spinning
plyacrylonitrile PAN
22. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
petroleum
additives
polymethylmethacrylate PMMA
number average molecular weight Mn
23. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
pigments
functionality
aramid
24. Is not asymetric and cannot have multiple configurations
block copolymers
mutual termination
fillers
any carbon with double bonds or repeated substituents
25. 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
gauche conformation
pigments
plasticizers
High volume thermoplastics HVTP
26. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
coloring agents
monomers
polymers
27. Arrangement of the largest substituents where the substituets are offset by 120
plasticizers
step- growth/condensation polymerization
staggered conformation
freeze line
28. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
screen pack
atactic
termination
blends
29. Additives whose primary purpose is to reduce the final cost of the product
thermosets
fillers
staggered conformation
melt spinning
30. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
shot size
tacticity
block copolymers
end groups
31. Covalent bonding of the polymer backbone and side groups
petroleum
viscose process
primary bonding
relative molecular mass RMM
32. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
injection molding
additives
polymethylmethacrylate PMMA
poly- p- phenylene benzobisoxazole PBO
33. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
polymethylmethacrylate PMMA
additives
syndiotactic dyad
primary termination
34. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
mutual termination
addition polymerization/chain growth/free- radical polymerization
thermoplastics
polymer backbone
35. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
spinneret
blends
copolymer
additives
36. Number of repeat/structural units in a polymer chain
oligomers
degree of polymerization DPn
relative molecular mass RMM
configuration
37. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
gauche conformation
atactic
propagation
acrylic
38. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
stabilizers
dyes
polyesters
propagation
39. Number of bonds a molecule has formed
acrylic
eclipsed conformation/ cis - conformation
mutual termination
functionality
40. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
thermoplastics
primary termination
conformation
plasticizers
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
rayon
shot size
weight average molecular weight Mw
elastomers
42. Polymers that contain amide (- N-) groups in the chain
random copolymers
polyamides
quenching
polyesters
43. 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
poly- p- phenylene benzobisoxazole PBO
dyes
isotactic dan
petroleum
44. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
asymetric
graft copolymers
rayon
configuration
45. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
High volume thermoplastics HVTP
atactic
stabilizers
thermosets
46. 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
plasticizers
branching
freeze line
primary termination
47. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
primary termination
die
condensation/step- growth polymerization
extruder
48. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
barrel
propagation
staggered conformation
plasticizers
49. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
polyesters
initiation
injection molding
polymer backbone
50. 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
step- growth/condensation polymerization
polymers
most common condensation/step- growth polymerization occur between....
freeze line