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Test your basic knowledge |
Modern Material Science And Engineering 2
Subject
:
engineering
Instructions:
Answer
50
questions in
20 minutes
.
1 minute extra for reading the instructions.
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
plyacrylonitrile PAN
syndiotactic dyad
hopper
addition polymerization/chain growth/free- radical polymerization
2. Process used to make thermoset fibers by performing the polymerization reacting in a solbent as the material flows through a spinneret and into a quenching bath
asymetric
solution spinning
tacticity
elastomers
3. 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
dyes
side groups/ substituents
configuration
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
degree of polymerization DPn
petroleum
die
barrel
5. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA
injection molding
vulcanization
eclipsed conformation/ cis - conformation
block copolymers
6. Molecule containing a highly reactive unpaired electron
injection molding
configuration
free radical
primary termination
7. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
cracking
extruder
oligomers
conformation
8. Softening agents
shot size
plasticizers
coloring agents
eclipsed conformation/ cis - conformation
9. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
conformation
viscose process
shot size
structural unit
10. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermoplastics
shot size
degree of polymerization DPn
thermosets
11. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
initiation
aramid
number average molecular weight Mn
rayon
12. An acid and an alcohol
dyes
initiation
plyacrylonitrile PAN
most common condensation/step- growth polymerization occur between....
13. Primary raw material for most polymers
blends
eclipsed conformation/ cis - conformation
elastomers
petroleum
14. 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
vinyl monomer
thermoplastics
branching
mutual termination
15. Double bounded organic molecule used to begin addition polymerization
glass transition temperature Tg
vinyl monomer
conformation
condensation/step- growth polymerization
16. Polymers that contain amide (- N-) groups in the chain
spinneret
injection molding
polyamides
number average molecular weight Mn
17. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
dyes
conformation
oligomers
end groups
18. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
polymers
shot size
secondary bonding
19. Low- molecular- weight building blocks repeated in the polymer chain
oligomers
trans - conformation
monomers
thermoplastics
20. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
pigments
elastomers
primary termination
21. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
poly- p- phenylene benzobisoxazole PBO
quenching
most common condensation/step- growth polymerization occur between....
melt spinning
22. Number of bonds a molecule has formed
functionality
extruder
homopolymer
blends
23. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
eclipsed conformation/ cis - conformation
polymers
coloring agents
elastomers
24. 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
poly- p- phenylene benzobisoxazole PBO
die
barrel
step- growth/condensation polymerization
25. Arrangement of the largest substituents where the substituets are offset by 120
eclipsed conformation/ cis - conformation
homopolymer
dyes
staggered conformation
26. Number of repeat/structural units in a polymer chain
free radical
asymetric
end groups
degree of polymerization DPn
27. Carbon atom capable of multiple configurations due to four different substituents
most common condensation/step- growth polymerization occur between....
end groups
asymetric
condensation/step- growth polymerization
28. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
fillers
addition polymerization/chain growth/free- radical polymerization
polyamides
spinneret
29. Porcess of breaking large organic hydrocarbons into smaller molecules
isotactic dan
plasticizers
cracking
freeze line
30. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
shot size
secondary bonding
functional groups
side groups/ substituents
31. Simple polymeric material produced as pellets in large quantities
condensation/step- growth polymerization
graft copolymers
mutual termination
High volume thermoplastics HVTP
32. Covalent bonding of the polymer backbone and side groups
primary bonding
cracking
constitution
tacticity
33. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
screen pack
thermosets
step- growth/condensation polymerization
polymer backbone
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
polymethylmethacrylate PMMA
dyes
staggered conformation
thermoplastics
35. 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
random copolymers
propagation
weight average molecular weight Mw
addition polymerization/chain growth/free- radical polymerization
36. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
asymetric
quenching
staggered conformation
propagation
37. Smallest repeating unit in a polymer. aka repeat unit
polymers
polymer backbone
freeze line
structural unit
38. Process of pushing polymers through a spinneret and winding the solidified fibers onto a tow - which imposes a shear stress on the fibers upstream as they emerge from the spinneret
petroleum
graft copolymers
melt spinning
plasticizers
39. Broad category of polymers that includes polymers containing urethane linkages
condensation/step- growth polymerization
functional groups
polyurethanes
free radical
40. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
thermoplastics
polyamides
eclipsed conformation/ cis - conformation
shot size
41. 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
mutual termination
blends
homopolymer
plasticizers
42. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
freeze line
isotactic dan
cracking
43. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
extruder
elastomers
side groups/ substituents
end groups
44. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
stabilizers
blends
additives
branching
45. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
thermosets
constitution
homopolymer
polymers
46. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
graft copolymers
shot size
termination
polyviyl chloride PVC
47. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
barrel
polyviyl chloride PVC
secondary bonding
extruder
48. 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
dyes
High volume thermoplastics HVTP
glass transition temperature Tg
relative molecular mass RMM
49. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
asymetric
functional groups
spinneret
pigments
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
thermoplastics
primary termination
freeze line
polyviyl chloride PVC