2.
Modified Rubber Via Grafting of Polymer on Olefinic Site
B.
Sehgal1* & G.B. Kunde2
1.
Maharaja Sayajirao University of Baroda, Deptt of Applied Chemistry,
Vadodara 390001, Gujrat, India, fax:912652423898,
e-mail:kundebg@yahoo.com
2. Datta Meghe College of Engineering, Deptt of Applied Chemistry,
Navi Mumbai,Maharashtra,India; fax: 022 27692854 , e-mail:kundegb@yahoo.co.in
Abstract:
Natural rubber (NR) is a very reactive rubber because of its
structure. The modification of NR with other functional groups
can be achieved by incorporation of monomer carrying the desired
functional group in the polymerization process using ene
reaction. Grafting of a second polymer on to the natural rubber
backbone leading to the chemical modification of the
polyisoprene occurs at allylic double bond system. This route
following grafting gave good control over the extent of reaction
as the reaction limits itself on individual olefinic sites
present on rubber and does not employ a catalyst that gets
poisoned by non rubbers. With the help of ene reaction not only
the molecular wt of the polymer that underwent grafting can be
accurately determined but the no of grafting sites can also be
controlled. Azo compounds have been used as effective modifiers
of NR as they have long-term stability and have fewer tendencies
to decompose to free radicals.
KEYWORDS: Natural rubber, the chemical modification, Azo
compounds.
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