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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. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
primary termination
die
constitution
dyes
2. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
gauche conformation
fillers
graft copolymers
barrel
3. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
degree of polymerization DPn
spinneret
thermosets
pigments
4. An acid and an alcohol
extruder
most common condensation/step- growth polymerization occur between....
freeze line
aramid
5. Two or more polymers mechanically mixed together but without covalent bonding between them
pigments
blends
dyes
eclipsed conformation/ cis - conformation
6. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
polymer backbone
graft copolymers
secondary bonding
hopper
7. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
quenching
aramid
polymer backbone
end groups
8. Polymer that is made up a single repeat unit
primary termination
blends
number average molecular weight Mn
homopolymer
9. Smallest repeating unit in a polymer. aka repeat unit
structural unit
screen pack
quenching
polyamides
10. Simple polymeric material produced as pellets in large quantities
weight average molecular weight Mw
High volume thermoplastics HVTP
hopper
relative molecular mass RMM
11. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
pigments
weight average molecular weight Mw
polypphenylene terephyhalamide PPTA
step- growth/condensation polymerization
12. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
side groups/ substituents
homopolymer
conformation
primary termination
13. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
branching
glass transition temperature Tg
number average molecular weight Mn
primary termination
14. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
additives
petroleum
alternating copolymers
plyacrylonitrile PAN
15. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
addition polymerization/chain growth/free- radical polymerization
stabilizers
degree of polymerization DPn
16. Softening agents
eclipsed conformation/ cis - conformation
freeze line
plasticizers
poly- p- phenylene benzobisoxazole PBO
17. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
plasticizers
thermoplastics
dyes
18. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
propagation
step- growth/condensation polymerization
pigments
addition polymerization/chain growth/free- radical polymerization
19. 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
step- growth/condensation polymerization
initiation
glass transition temperature Tg
coloring agents
20. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
free radical
polymer backbone
condensation/step- growth polymerization
21. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
poly- p- phenylene benzobisoxazole PBO
number average molecular weight Mn
eclipsed conformation/ cis - conformation
extruder
22. One type of polymer that contains at least 85% of polyacrylonitrile PAN
structural unit
vulcanization
acrylic
branching
23. Conformation in which the largest substituents are offset by 180
trans - conformation
cracking
plasticizers
melt spinning
24. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
barrel
pigments
nylon
25. 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
polyesters
tow
constitution
branching
26. Additives whose primary purpose is to reduce the final cost of the product
branching
step- growth/condensation polymerization
fillers
plyacrylonitrile PAN
27. Carbon atom capable of multiple configurations due to four different substituents
asymetric
configuration
branching
injection molding
28. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
end groups
functional groups
random copolymers
thermosets
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
weight average molecular weight Mw
copolymer
constitution
alternating copolymers
30. Atoms attached to the polymer backbone.
primary bonding
side groups/ substituents
acrylic
number average molecular weight Mn
31. First step in the process of polymerization - during which a free radical is formed
initiation
tow
polymethylmethacrylate PMMA
tacticity
32. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
polymethylmethacrylate PMMA
number average molecular weight Mn
polyesters
alternating copolymers
33. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
block copolymers
most common condensation/step- growth polymerization occur between....
branching
dyes
34. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
acrylic
polyviyl chloride PVC
spinneret
eclipsed conformation/ cis - conformation
35. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
degree of polymerization DPn
random copolymers
termination
rayon
36. Number of bonds a molecule has formed
polyviyl chloride PVC
functionality
polyurethanes
plasticizers
37. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
free radical
aramid
homopolymer
polyamides
38. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
vinyl monomer
extruder
alternating copolymers
quenching
39. Molecule containing a highly reactive unpaired electron
alternating copolymers
rayon
free radical
oligomers
40. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
constitution
propagation
step- growth/condensation polymerization
41. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
monomers
addition polymerization/chain growth/free- radical polymerization
die
42. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
vinyl monomer
coloring agents
tacticity
stabilizers
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
plasticizers
constitution
stabilizers
die
44. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
syndiotactic dyad
acrylic
isotactic dan
45. 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
vinyl monomer
condensation/step- growth polymerization
barrel
vulcanization
46. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
polyamides
tow
plasticizers
rayon
47. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
primary termination
structural unit
asymetric
48. 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
nylon
die
polyurethanes
barrel
49. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
injection molding
thermosets
polyamides
secondary bonding
50. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
functionality
blends
configuration
plyacrylonitrile PAN