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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. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
mutual termination
constitution
injection molding
poly- p- phenylene benzobisoxazole PBO
2. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
stabilizers
petroleum
injection molding
coloring agents
3. 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
solution spinning
hopper
stabilizers
glass transition temperature Tg
4. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
asymetric
additives
elastomers
step- growth/condensation polymerization
5. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
addition polymerization/chain growth/free- radical polymerization
eclipsed conformation/ cis - conformation
staggered conformation
extruder
6. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
aramid
homopolymer
primary termination
7. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
initiation
aramid
homopolymer
8. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
shot size
hopper
nylon
9. Low- molecular- weight building blocks repeated in the polymer chain
end groups
monomers
weight average molecular weight Mw
trans - conformation
10. 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
coloring agents
barrel
vulcanization
branching
11. Arrangement of the largest substituents where the substituets are offset by 120
condensation/step- growth polymerization
polyamides
staggered conformation
alternating copolymers
12. 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
melt spinning
weight average molecular weight Mw
conformation
isotactic dan
13. Simple polymeric material produced as pellets in large quantities
mutual termination
primary termination
High volume thermoplastics HVTP
viscose process
14. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
block copolymers
propagation
plyacrylonitrile PAN
aramid
15. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
atactic
hopper
shot size
relative molecular mass RMM
16. 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
termination
eclipsed conformation/ cis - conformation
step- growth/condensation polymerization
solution spinning
17. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
glass transition temperature Tg
thermosets
side groups/ substituents
relative molecular mass RMM
18. Smallest repeating unit in a polymer. aka repeat unit
structural unit
plyacrylonitrile PAN
dyes
cracking
19. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
condensation/step- growth polymerization
graft copolymers
shot size
20. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
step- growth/condensation polymerization
polymethylmethacrylate PMMA
rayon
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
alternating copolymers
branching
atactic
plasticizers
22. 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
solution spinning
degree of polymerization DPn
structural unit
weight average molecular weight Mw
23. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
configuration
primary termination
blends
tow
24. 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
tow
poly- p- phenylene benzobisoxazole PBO
mutual termination
conformation
25. Covalently bonded chains of molecules with small monomer units repeated from end to end
oligomers
polymer backbone
polymers
polyesters
26. Polymers that contain amide (- N-) groups in the chain
trans - conformation
side groups/ substituents
atactic
polyamides
27. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
melt spinning
thermoplastics
polyesters
syndiotactic dyad
28. Conformation in which the largest substituents are offset by 180
oligomers
quenching
side groups/ substituents
trans - conformation
29. One type of polymer that contains at least 85% of polyacrylonitrile PAN
isotactic dan
elastomers
monomers
acrylic
30. Carbon atom capable of multiple configurations due to four different substituents
asymetric
secondary bonding
atactic
end groups
31. 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
thermosets
relative molecular mass RMM
homopolymer
monomers
32. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
primary bonding
functional groups
end groups
hopper
33. 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
viscose process
functionality
weight average molecular weight Mw
isotactic dan
34. Covalent bonding of the polymer backbone and side groups
primary bonding
most common condensation/step- growth polymerization occur between....
polyurethanes
aramid
35. 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
quenching
side groups/ substituents
plasticizers
polyurethanes
36. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
functional groups
structural unit
rayon
37. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
functional groups
weight average molecular weight Mw
polyviyl chloride PVC
atactic
38. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
polyamides
cracking
graft copolymers
degree of polymerization DPn
39. 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
plyacrylonitrile PAN
number average molecular weight Mn
condensation/step- growth polymerization
trans - conformation
40. Pigments or dyes that change the way light is absorbed or reflected by a polymer
weight average molecular weight Mw
coloring agents
mutual termination
screen pack
41. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
hopper
polyesters
blends
termination
42. Relative configuration of adjecent asymmetric carbons
constitution
free radical
tacticity
copolymer
43. Polymer made up of two of more differenet monomers covalently bonded together
trans - conformation
screen pack
copolymer
functional groups
44. Atoms attached to the polymer backbone.
branching
relative molecular mass RMM
side groups/ substituents
nylon
45. Primary raw material for most polymers
spinneret
vinyl monomer
constitution
petroleum
46. Two or more polymers mechanically mixed together but without covalent bonding between them
mutual termination
petroleum
gauche conformation
blends
47. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
shot size
polymethylmethacrylate PMMA
gauche conformation
most common condensation/step- growth polymerization occur between....
48. 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
block copolymers
solution spinning
addition polymerization/chain growth/free- radical polymerization
polymethylmethacrylate PMMA
49. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
High volume thermoplastics HVTP
poly- p- phenylene benzobisoxazole PBO
viscose process
aramid
50. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
stabilizers
alternating copolymers
propagation
polymers