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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.12 [2005] >
IJCT Vol.12(1) [January 2005] >
| Title: | Free radical copolymerization of limonene with butyl methacrylate: Synthesis and characterization |
| Authors: | Sharma, Saroj
Srivastava, A K |
| Keywords: | Limonene
butyl methacrylate
copolymers
reactivity ratios |
| Issue Date: | Jan-2005 |
| Publisher: | CSIR |
| IPC Code: | C08F 2/00 |
| Abstract: | The radical copolymerization of
monocyclic terpene namely limonene with butyl methacrylate in xylene at 80±0.1°C for 50 min, using benzoylperoxide (BPO) as an initiator has been carried out under the inert
atmosphere of nitrogen. The system follows ideal kinetics i.e. Rp  [BPO]0.5[BMA]1.0[Lim.]–1.0.
The rate of polymerization (Rp)
decreases as [limonene] increases, which might be due to penultimate unit
effect. The overall energy of activation has been calculated as 34 kJ/mol. The
formation of the copolymer is confirmed by the presence of bands at 1727 and
2956 cm–1 due to ester carbonyl of butyl methacrylate and olefinic
C–H stretching of limonene, respectively. Further, the peaks at 3.8–4.2 and
5.0–5.6  , were observed in 1H
NMR spectra due to methylene proton adjacent to ester linkage of butyl
methacrylate and trisubstituted olefinic
protons of limonene, respectively. The value of reactivity ratios r1(BMA) = 0.125 and r2(Lim.)= 0.026 has been
calculated by using Kelen-Tüdos method. Alfrey-Price Q–e parameter for limonene
has been calculated as 0.30 and –0.46. The glass transition temperature of the
copolymer is determined as 35 oC. |
| Page(s): | 62-67 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.12(1) [January 2005]
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