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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. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
eclipsed conformation/ cis - conformation
primary termination
hopper
nylon
2. Double bounded organic molecule used to begin addition polymerization
homopolymer
vinyl monomer
elastomers
freeze line
3. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
any carbon with double bonds or repeated substituents
termination
thermoplastics
4. 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
isotactic dan
aramid
petroleum
polyviyl chloride PVC
5. Arrangement of the largest substituents where the substituets are offset by 120
fillers
syndiotactic dyad
copolymer
staggered conformation
6. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
poly- p- phenylene benzobisoxazole PBO
additives
constitution
melt spinning
7. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
branching
viscose process
vulcanization
mutual termination
8. Number of bonds a molecule has formed
conformation
configuration
plasticizers
functionality
9. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
polyviyl chloride PVC
polymethylmethacrylate PMMA
screen pack
alternating copolymers
10. 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
secondary bonding
mutual termination
primary bonding
primary termination
11. Polymer made up of two of more differenet monomers covalently bonded together
polyurethanes
solution spinning
copolymer
side groups/ substituents
12. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
freeze line
pigments
graft copolymers
stabilizers
13. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
fillers
secondary bonding
termination
polyviyl chloride PVC
14. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
free radical
asymetric
polymethylmethacrylate PMMA
screen pack
15. Primary raw material for most polymers
injection molding
petroleum
primary termination
thermosets
16. 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
polyviyl chloride PVC
elastomers
oligomers
17. 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
mutual termination
degree of polymerization DPn
free radical
relative molecular mass RMM
18. First step in the process of polymerization - during which a free radical is formed
termination
die
glass transition temperature Tg
initiation
19. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
tow
propagation
end groups
syndiotactic dyad
20. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
isotactic dan
mutual termination
random copolymers
thermoplastics
21. 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
branching
block copolymers
thermoplastics
petroleum
22. Relative configuration of adjecent asymmetric carbons
injection molding
alternating copolymers
atactic
tacticity
23. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
configuration
monomers
shot size
oligomers
24. Covalently bonded chains of molecules with small monomer units repeated from end to end
poly- p- phenylene benzobisoxazole PBO
alternating copolymers
secondary bonding
polymers
25. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
side groups/ substituents
quenching
gauche conformation
26. 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
acrylic
tacticity
condensation/step- growth polymerization
cracking
27. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
vulcanization
propagation
configuration
aramid
28. 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
injection molding
barrel
freeze line
mutual termination
29. Broad category of polymers that includes polymers containing urethane linkages
polyesters
petroleum
syndiotactic dyad
polyurethanes
30. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
barrel
polymer backbone
blends
asymetric
31. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
coloring agents
shot size
addition polymerization/chain growth/free- radical polymerization
end groups
32. Softening agents
elastomers
freeze line
mutual termination
plasticizers
33. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
oligomers
addition polymerization/chain growth/free- radical polymerization
syndiotactic dyad
additives
34. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
coloring agents
propagation
atactic
functional groups
35. 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
secondary bonding
functionality
eclipsed conformation/ cis - conformation
number average molecular weight Mn
36. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
alternating copolymers
step- growth/condensation polymerization
staggered conformation
plyacrylonitrile PAN
37. 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
functionality
primary termination
trans - conformation
38. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
acrylic
any carbon with double bonds or repeated substituents
side groups/ substituents
vulcanization
39. Pigments or dyes that change the way light is absorbed or reflected by a polymer
step- growth/condensation polymerization
termination
structural unit
coloring agents
40. 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
oligomers
glass transition temperature Tg
constitution
functionality
41. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
injection molding
vinyl monomer
freeze line
42. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
any carbon with double bonds or repeated substituents
cracking
High volume thermoplastics HVTP
poly- p- phenylene benzobisoxazole PBO
43. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
additives
aramid
spinneret
extruder
44. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
thermoplastics
fillers
vulcanization
45. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
configuration
structural unit
injection molding
46. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
configuration
structural unit
nylon
tow
47. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
quenching
degree of polymerization DPn
rayon
coloring agents
48. Additives whose primary purpose is to reduce the final cost of the product
trans - conformation
copolymer
vulcanization
fillers
49. 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
spinneret
melt spinning
poly- p- phenylene benzobisoxazole PBO
condensation/step- growth polymerization
50. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
trans - conformation
configuration
fillers