Chemistry Reference
In-Depth Information
Cyanoethylated cellulose does not appear to be used commercially in any quantity.
Very stable silyl ethers form when cellulose is treated with trimethyl chloro-silane or with bis
(trimethylsilyl)-acetamide [
15
]:
Si(CH
3
)
3
OH
O
Si
Cl
HO
HO
O
O
O
O
CH
2
OH
n
Si(CH
3
)
3
n
O
N
Si(CH
3
)
3
Si(CH
3
)
3
O
Some interesting approaches to cellulose modification are possible via formations of double bonds
in the glucopyranosine unit at the 5,6 positions [
16
]. This is accomplished by dehydro-halogenating
a previously formed 6-iodocellulose:
OH
OH
HO
HO
O
O
O
O
n
I
n
The resultant unsaturated compound can be converted into a number of derivatives. Examples of
some of them are:
OH
OH
HO
HO
HCCl
3
O
O
O
O
n
n
CCl
3
OH
OH
HO
HO
HSiCl
3
O
O
O
O
n
n
SiCl
3
Other compounds that can be added across the double bonds are carbon tetrachloride, phosphorus
trichloride, and methyl alcohol. Many graft copolymers of cellulose were reported. Some are
described in Chap.
9
.
In wood, cellulose is present with lignin, a natural phenolic polymer, described in Sect.
8.3
.
Kobayshi and coworkers [
16
] grafted phenolic resins onto cellulose to form an artificial wood
polymer.
