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|Title:||Synthesis and characterization of functional copolymers of citronellol and methyl methacrylate|
|Authors:||Srivastava, A K|
|Abstract:||The radical copolymerisation of citronellol with methyl methacrylate in xylene at 80±1°C for 50 minutes in the presence of azobisisobutyronitrile (AIBN) as well as p-acetylbenzylidene triphenylarsoniumylide (p-ABTA Y) follows ideal kinetics and results in the formation of an alternating copolymer in both cases. The overall activation energies with (AIBN) and (p-ABTAY) are 77 kJ/mol and 138 kJ/mol respectively. The copolymer(s) have been characterised by different spectral analyses like IR, NMR, 13C NMR, FTIR, etc, which confirms the existence of alcoholic and ester groups in citronellol and methylmethacrylate respectively. The monomer reactivity ratios, using Kelen-Tudos method are r1 (MMA)= 0.016 and r2 (citronellol) = 0.00 12 using (AIBN) and r1 (MMA)=0.02 and r2 (citronellol) = 0.001 using (p-ABTAY). The glass transition temperature (Tg) of the copolymer, calculated with the help of differential scanning calorimetry (DSC), is 80oC. The Alfrey-price, Q-e parameters for citronellol has been calculated as 0.1009 and -1.073 for (AIBN) and 0.619 and -2.565 for (p-ABTAY). A possible mechanism of the copolymerization has been proposed.|
|Appears in Collections:||IJC-A Vol.42A(01) [January 2003]|
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