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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
polymer backbone
free radical
coloring agents
poly- p- phenylene benzobisoxazole PBO
2. 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
hopper
any carbon with double bonds or repeated substituents
isotactic dan
3. Number of repeat/structural units in a polymer chain
plyacrylonitrile PAN
primary bonding
conformation
degree of polymerization DPn
4. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
constitution
quenching
rayon
5. 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
polyesters
trans - conformation
secondary bonding
eclipsed conformation/ cis - conformation
6. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
pigments
addition polymerization/chain growth/free- radical polymerization
polymer backbone
number average molecular weight Mn
7. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
polyviyl chloride PVC
quenching
High volume thermoplastics HVTP
melt spinning
8. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
functional groups
asymetric
extruder
polymers
9. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
acrylic
trans - conformation
shot size
10. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
block copolymers
atactic
side groups/ substituents
propagation
11. 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
graft copolymers
free radical
monomers
number average molecular weight Mn
12. 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
screen pack
weight average molecular weight Mw
syndiotactic dyad
13. Atoms attached to the polymer backbone.
side groups/ substituents
homopolymer
polymethylmethacrylate PMMA
free radical
14. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
elastomers
barrel
functionality
fillers
15. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
screen pack
die
functionality
16. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
constitution
branching
spinneret
barrel
17. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
block copolymers
hopper
polypphenylene terephyhalamide PPTA
propagation
18. First step in the process of polymerization - during which a free radical is formed
elastomers
shot size
relative molecular mass RMM
initiation
19. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
cracking
end groups
weight average molecular weight Mw
trans - conformation
20. Covalent bonding of the polymer backbone and side groups
gauche conformation
viscose process
primary bonding
mutual termination
21. Carbon atom capable of multiple configurations due to four different substituents
propagation
vinyl monomer
injection molding
asymetric
22. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
relative molecular mass RMM
functionality
structural unit
stabilizers
23. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
staggered conformation
condensation/step- growth polymerization
High volume thermoplastics HVTP
atactic
24. Covalently bonded chains of molecules with small monomer units repeated from end to end
extruder
screen pack
branching
polymers
25. Polymer that is made up a single repeat unit
nylon
petroleum
most common condensation/step- growth polymerization occur between....
homopolymer
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
polymer backbone
stabilizers
functional groups
condensation/step- growth polymerization
27. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
step- growth/condensation polymerization
fillers
polymethylmethacrylate PMMA
28. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
polymer backbone
homopolymer
polyviyl chloride PVC
29. Polymer made up of two of more differenet monomers covalently bonded together
eclipsed conformation/ cis - conformation
copolymer
constitution
solution spinning
30. Molecule containing a highly reactive unpaired electron
termination
free radical
primary termination
melt spinning
31. Conformation that occurs when the largest substituent in a molecule are offset by 60
polymethylmethacrylate PMMA
gauche conformation
petroleum
barrel
32. 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
melt spinning
extruder
High volume thermoplastics HVTP
mutual termination
33. 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
primary bonding
configuration
relative molecular mass RMM
conformation
34. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
gauche conformation
shot size
termination
eclipsed conformation/ cis - conformation
35. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
thermoplastics
screen pack
mutual termination
nylon
36. Smallest repeating unit in a polymer. aka repeat unit
degree of polymerization DPn
polyesters
quenching
structural unit
37. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
secondary bonding
free radical
random copolymers
blends
38. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
constitution
melt spinning
viscose process
any carbon with double bonds or repeated substituents
39. Softening agents
extruder
plasticizers
melt spinning
copolymer
40. 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
monomers
staggered conformation
melt spinning
most common condensation/step- growth polymerization occur between....
41. Polymers that contain amide (- N-) groups in the chain
thermoplastics
gauche conformation
condensation/step- growth polymerization
polyamides
42. 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
propagation
coloring agents
extruder
plasticizers
43. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
configuration
fillers
polymethylmethacrylate PMMA
thermoplastics
44. Conformation in which the largest substituents are offset by 180
trans - conformation
side groups/ substituents
cracking
polyviyl chloride PVC
45. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
coloring agents
polyurethanes
configuration
blends
46. 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
condensation/step- growth polymerization
barrel
side groups/ substituents
polymer backbone
47. Arrangement of the largest substituents where the substituets are offset by 120
vulcanization
quenching
staggered conformation
primary bonding
48. 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
addition polymerization/chain growth/free- radical polymerization
configuration
weight average molecular weight Mw
injection molding
49. An acid and an alcohol
polymethylmethacrylate PMMA
extruder
relative molecular mass RMM
most common condensation/step- growth polymerization occur between....
50. Number of bonds a molecule has formed
functionality
any carbon with double bonds or repeated substituents
trans - conformation
homopolymer