Chemistry Reference
In-Depth Information
13
C-NMR spectrum of the polyformate of milkweed oil.
Figure 10.9
large increase in the kinematic viscosity of EMWO. An even greater, almost
50-fold, increase in kinematic viscosity was observed for the PHMWO de-
rivative. This increase in viscosity of HMWO is attributable to a high degree of
intermolecular hydrogen-bonding between HMWO molecules. Esterification
of PHMWO, however, resulted in a reduction of kinematic viscosity,
Table 10.3. The degree of attenuation in viscosity of esterified PHMWO was a
function of the substituent group chain length.
17
The VI of unmodified MWO is 210, which is slightly lower than the values
for SB and CAN oils, but within the range expected of seed oils.
18
Epoxida-
tion and esterification resulted in a dramatic decrease in the VI of milkweed.
For example, the VI of PHMWO was 85, which improved slightly with
esterification. The VI of esterified PHMWO increased with increasing chain
length of the substituent group.
