Chemistry Reference
In-Depth Information
3.
Write the mechanism using curved arrows and showing electron flow for
the anionic polymerization of styrene using butyl lithium.
4.
Consider the following four polymers and select any that have sufficient
thermal properties to be used to fabricate dishware to be used in a dish-
washer with a steam cycle. (the steam is not pressurized; select all that
apply; could be any number from 0 to 4 choices).
a.
an amorphous polymer with a Tg of 60
∘
C
b.
a semicrystalline polymer with a Tg of 40
∘
C and a melting point of
220
∘
C
c.
an amorphous polymer with a Tg of 150
∘
C
d.
a semicrystalline polymer with a Tg of
20
∘
C and a melting point of
−
150
∘
C
5.
Select the pair that won the 1963 Nobel prize for their work in olefin
polymerization catalyzed by organometallics such as TiCl
3
/Et
3
Al/MgCl
2
a.
Simon and Garfunkel
b.
Joule and Rutherford
c.
Ziegler and Natta
d.
Abbott and Costello
e.
Martin & Lewis
6.
If we imagine a group of three polymer molecules with molecular weights
of 40,000 g/mol, 180,000 g/mol, and 200,000 g/mol, calculate (to three
significant figures) M
n
,M
w
and polydispersity (Pd).
7.
If I am driving a Kia with a polypropylene bumper, which polypropylene
would be best if I were in a collision on College Road?
a.
polypropylene with the highest M
w
b.
polypropylene with the lowest M
w
c.
polypropylene with the lowest viscosity
d.
polypropylene with the highest Tg.
8.
Although, perhaps not an oxymoron (e.g. jumbo shrimp), which of the
following word pairs indicates a lack of understanding about polymers.
a.
syndiotactic polyethylene
b.
atactic polystyrene
c.
isotactic polypropylene
d.
atactic polypropylene
9.
Consider the two superimposed GPC curves. On the x axis, is the
retention time in minutes (from 5 minutes to 14 minutes). Sample A
begins eluting around 6 minutes and has all eluted by about 11 minutes;
Sample B begins eluting around 8 minutes.
Search WWH ::
Custom Search