Chemistry Reference
In-Depth Information
Figure 6.11 Nanocelluloses made by different methods.
Figure 6.12 TEM images of nanocelluloses made by different methods and from
different sources.
new, lightweight and strong PU products which can be utilized in many
industrial and consumer applications.
Li and co-workers found that rigid PU foams with 0.75% cellulose whis-
kers had superior compressive and tensile strengths and compressive
moduli compared to neat foams.
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They also discovered that the presence of
cellulose whiskers in PU foams helped with cell dispersion and produced a
better cell size distribution. Like wood fibers, nanocellulose was shown to
react with PU foams via FT-IR results.
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However, there was a drawback in
that freeze-dried nanocellulose must be first dispersed in dimethylforma-
mide (DMF) by sonication, which is dicult to remove even under reduced
