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Polystyrene sample B
Polystyrene sample A
5
6
7
8
9
10
11
12
13
14
Which is likely to have the greater tensile strength?
a.
Sample A
b.
Sample B
c.
they should have the same
d.
it's a coin flip; the GPC doesn't give any pertinent information
10.
Consider three polyethylene chains, one with molecular weight 60,000,
one with molecular weight 100,000, and one with molecular weight
200,000.
a.
to the nearest 1,000, what is the M
n
?
b.
to the nearest 1,000, what is the M
w
?
c.
to three significant figures, what is the polydispersity?
11.
Generally as molecular weight increases:
a.
melt viscosity and impact resistance increase
b.
melt viscosity and impact resistance decrease
c.
melt viscosity increases and impact resistance decreases
d.
melt viscosity decreases and impact resistance increases
REFERENCES
1. Graeme Moad, Ezio Rizzardo, David H Solomon. Macromolecules 1982:
15:909 - 914.
2. Yoshiyuki Ishihama, Mitsuo Sawamoto, Toshinobu Higashimura. Polymer Bul-
letin 1990; 24:201 - 206.
3. YV Kissin. Journal of Catalysis 2012; 292:188 - 200.
4. JP Hogan, RL Banks. U.S. Pat. No. 2,825,721. 1958.
5. A Andresen, HG Cordes, J Herwig, W Kaminsky, A Merck, R Mottweiler,
J Pein, H Sinn, HJ Vollmer. Angewandte Chemie 1976; 88(20): 689 - 690.
6. TJ Kealy, PL Pauson. Nature 1951; 168:1039 - 1040.
7. SA Miller,JA Tebboth, JF Tremaine. J. Chem. Soc. 1952:632 - 635.
8. G Wilkinson, M Rosenblum, MC Whiting, RB Woodward, J. Am.Chem Soc.
1952; 74:2125 - 2126.
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