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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
Series/Report no.: 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 style="">i.e</i>. <i style="">R</i><sub>p</sub> <img src='/image/spc_char/alpha.gif' border=0> [BPO]<sup>0.5</sup>[BMA]<sup>1.0</sup>[Lim.]<sup>–1.0</sup>. The rate of polymerization (<i style="">R</i><sub>p</sub>) 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<sup>–1</sup> 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 <img src='/image/spc_char/delta1.gif' border=0>, were observed in <sup>1</sup>H 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 <i style="">r</i><sub>1</sub>(BMA) = 0.125 and <i style="">r</i><sub>2</sub>(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 <sup>o</sup>C.
Description: 62-67
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.12(1) [January 2005]

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