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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. 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
rayon
block copolymers
thermoplastics
branching
2. First step in the process of polymerization - during which a free radical is formed
quenching
poly- p- phenylene benzobisoxazole PBO
initiation
structural unit
3. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
mutual termination
hopper
solution spinning
atactic
4. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
random copolymers
freeze line
High volume thermoplastics HVTP
staggered conformation
5. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
block copolymers
isotactic dan
propagation
secondary bonding
6. Conformation that occurs when the largest substituent in a molecule are offset by 60
side groups/ substituents
plasticizers
block copolymers
gauche conformation
7. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
coloring agents
aramid
trans - conformation
8. Two or more polymers mechanically mixed together but without covalent bonding between them
relative molecular mass RMM
branching
tow
blends
9. 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
homopolymer
barrel
High volume thermoplastics HVTP
polyesters
10. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
functional groups
polymers
propagation
11. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
side groups/ substituents
structural unit
die
12. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
condensation/step- growth polymerization
viscose process
polymethylmethacrylate PMMA
initiation
13. Double bounded organic molecule used to begin addition polymerization
polypphenylene terephyhalamide PPTA
functionality
vinyl monomer
primary termination
14. Pigments or dyes that change the way light is absorbed or reflected by a polymer
coloring agents
plyacrylonitrile PAN
quenching
condensation/step- growth polymerization
15. 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
polyamides
polymer backbone
stabilizers
16. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
glass transition temperature Tg
branching
vulcanization
oligomers
17. 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
shot size
polymethylmethacrylate PMMA
polyamides
18. Relative configuration of adjecent asymmetric carbons
trans - conformation
mutual termination
copolymer
tacticity
19. Primary raw material for most polymers
petroleum
number average molecular weight Mn
oligomers
relative molecular mass RMM
20. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
random copolymers
coloring agents
poly- p- phenylene benzobisoxazole PBO
quenching
21. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
polymers
propagation
side groups/ substituents
termination
22. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymethylmethacrylate PMMA
additives
secondary bonding
polymers
23. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
polymethylmethacrylate PMMA
die
screen pack
shot size
24. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
pigments
polyesters
stabilizers
functional groups
25. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
vinyl monomer
graft copolymers
initiation
alternating copolymers
26. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
quenching
plyacrylonitrile PAN
vinyl monomer
extruder
27. Atoms attached to the polymer backbone.
copolymer
hopper
side groups/ substituents
degree of polymerization DPn
28. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
addition polymerization/chain growth/free- radical polymerization
copolymer
quenching
polymer backbone
29. 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
primary termination
coloring agents
weight average molecular weight Mw
constitution
30. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
pigments
addition polymerization/chain growth/free- radical polymerization
rayon
quenching
31. 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
hopper
petroleum
polyesters
conformation
32. Conformation in which the largest substituents are offset by 180
primary bonding
rayon
propagation
trans - conformation
33. 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
stabilizers
glass transition temperature Tg
number average molecular weight Mn
34. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
branching
extruder
monomers
constitution
35. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
hopper
shot size
rayon
36. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
screen pack
quenching
gauche conformation
polyesters
37. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
free radical
conformation
primary bonding
High volume thermoplastics HVTP
38. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
stabilizers
weight average molecular weight Mw
random copolymers
polyesters
39. Porcess of breaking large organic hydrocarbons into smaller molecules
isotactic dan
coloring agents
atactic
cracking
40. Smallest repeating unit in a polymer. aka repeat unit
polyesters
polymer backbone
structural unit
side groups/ substituents
41. 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
polymethylmethacrylate PMMA
step- growth/condensation polymerization
barrel
coloring agents
42. An acid and an alcohol
end groups
most common condensation/step- growth polymerization occur between....
injection molding
polypphenylene terephyhalamide PPTA
43. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
relative molecular mass RMM
structural unit
termination
any carbon with double bonds or repeated substituents
44. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
pigments
shot size
dyes
conformation
45. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
plasticizers
plasticizers
screen pack
polymer backbone
46. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
polyamides
screen pack
most common condensation/step- growth polymerization occur between....
constitution
47. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
isotactic dan
eclipsed conformation/ cis - conformation
additives
48. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
condensation/step- growth polymerization
initiation
freeze line
49. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
functionality
additives
structural unit
branching
50. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
primary termination
dyes
tow
polypphenylene terephyhalamide PPTA