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Investigations on some selected conducting polymers and polymer ...

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Chapter-L<br />

Generally there are four different methods for co<strong>polymer</strong>izati<strong>on</strong> [9].<br />

a) Insitu <strong>polymer</strong>izati<strong>on</strong> of both m<strong>on</strong>omers to form a r<strong>and</strong>om<br />

co<strong>polymer</strong><br />

b) Grafting of the solubilizing <strong>polymer</strong> <strong>on</strong>to the backb<strong>on</strong>e of the<br />

insoluble <strong>polymer</strong><br />

c) Grafting of the insoluble <strong>polymer</strong> <strong>on</strong>to the backb<strong>on</strong>e of the<br />

soluble <strong>polymer</strong><br />

d) Combinati<strong>on</strong> ofboth soluble <strong>and</strong> insoluble <strong><strong>polymer</strong>s</strong> to form a<br />

block co<strong>polymer</strong> by various synthetic methods<br />

e) Insitu <strong>polymer</strong>izati<strong>on</strong> of an insoluble <strong>polymer</strong> <strong>on</strong>to the matrix<br />

ofa soluble <strong>polymer</strong>.<br />

Examples include composites of polyaniline <strong>and</strong> polypyrrole<br />

formed by in situ <strong>polymer</strong>izati<strong>on</strong> in matrices such as poly<br />

(vinyl chloride) (PVC), polyvinyla1cohol (PVA), poly<br />

(vinylidinechloride-co-trifluoroethylene) <strong>and</strong> brominated<br />

poly (vinyl carbazole) [37,50].<br />

f) Counteri<strong>on</strong>-induced processibilityofc<strong>on</strong>ducting polyaniline (PANI)<br />

Cao etal [28] have reported that the processibilty of highly<br />

c<strong>on</strong>ducting PANI with reas<strong>on</strong>ably high molecular weight<br />

could be improved by using functi<strong>on</strong>alized prot<strong>on</strong>ic acids.<br />

The functi<strong>on</strong>alized prot<strong>on</strong>ic acid has the form H+(M-R).(M-R)<br />

is the counteri<strong>on</strong> ani<strong>on</strong>ic species. R is the functi<strong>on</strong>al group<br />

chosen to be soluble in n<strong>on</strong>polar or weakly polar organic<br />

solvents. Dodecyl benzene sulf<strong>on</strong>ic acid (DBSA) <strong>and</strong>

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