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Title: Free radical copolymerization of limonene with butyl methacrylate: Synthesis and characterization
Authors: Sharma, Saroj
Srivastava, A K
Keywords: Limonene
butyl methacrylate
reactivity ratios
Issue Date: Jan-2005
Publisher: CSIR
IPC CodeC08F 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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