Synthesis and characterization of a terpolymer of limonene, styrene, and methyl methacrylate via a free-radical route

✍ Scribed by Saroj Sharma; A. K. Srivastava

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 82 KB
• Volume: 91
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.13376

✦ Synopsis

Abstract

The free‐radical terpolymerization of a monocyclic terpene, namely, limonene (Lim), with styrene (Sty) and methyl methacrylate (MMA) in xylene at 80 ± 0.1°C for 2 h, with benzoyl peroxide (BPO) as an initiator under an inert atmosphere of nitrogen was extensively studied. The kinetic expression was R~p~α[BPO]^0.5^[Sty]^1.0^[MMA]^1.0^[Lim]^−1.0^, where R~p~ is the rate of polymerization. The overall energy of activation was calculated as 26 kJ/mol. R~p~ decreased as [Lim] increased. This was due to a penultimate unit effect. The Fourier transform infrared spectra of the terpolymer showed bands at 3025–3082, 1728, and 2851–2984 cm^−1^ due to CH stretching of phenyl (C~6~H~5~) protons of Sty, OCH~3~ of MMA, and trisubstituted olefinic protons of Lim, respectively. The ^1^H‐NMR spectra showed peaks at 7.3–8.1, 3.9–4.4, and 5.0–5.5 δ due to the phenyl, methoxy, and trisubstituted olefinic protons of Sty, MMA and Lim, respectively. The values of the reactivity ratios r~1~ (MMA; 0.33) and r~2~ (Sty + Lim; 0.06) were calculated with the Kelen–T̈udos method. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 2343–2347, 2004