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d
n
2
r
4
n
g
|
1
HCl
generated
chlorine
gas
KMnO
4
Chlorine
gas
.
PHA in CCl
4
Figure 7.10 Reaction set-up for the chemical modification of PHA via chlorination.
presence of an elemental F
2
/N
2
gas mixture. The fluorinated polymer was
reported to show marked changes in its thermo-chemical characteristics.
30
Mihara et al.
58
and Imamura et al.
59
filed an embodiment that detailed the
procedures for PHA chemical modification by sulfanyl halogenation and the
potential application of the modified PHA as a toner electrostatic charge
controller in electrophotographic imaging. The inventors disclosed that the
modified PHA possesses excellent charging stability, high charging ability,
and enhanced dispersibility, when used as a toner charge control agent in an
electrophotographic process.
58,59
7.2.5 Graft and Cross-linking Polymerization
Another method to modify PHA is by graft copolymerization, which results
in the formation of a modified segmented copolymer with improved prop-
erties such as increased wettability and thermo-mechanical strengths.
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