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Synthesis and characterization of functional copolymer of Linalool and vinyl acetate: A kinetic study
Author(s) -
Shukla Anjali,
Srivastava A. K.
Publication year - 2004
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.13658
Subject(s) - copolymer , polymer chemistry , benzoyl peroxide , reactivity (psychology) , vinyl acetate , chemistry , kinetics , thermal stability , activation energy , proton nmr , fourier transform infrared spectroscopy , monomer , organic chemistry , polymer , chemical engineering , medicine , physics , alternative medicine , pathology , quantum mechanics , engineering
Linalool (LIN) and vinyl acetate (VA) were copolymerized by benzoyl peroxide (BPO) in p ‐xylene at 60°C for 90 min. The system follows nonideal kinetics: R p α[ I ] 0.6 [LIN] 1.2 [VA] 1.1 . It results in the formation of alternating copolymer as evidenced from reactivity ratios as r 1 (VA) = 0.01, r 2 (LIN) = 0.0015, which have been calculated by Kelen–Tudos method. The overall activation energy is 82 kJ/mol. The FTIR spectrum of the copolymer shows the presence of the band at 3425 cm −1 due to alcoholic group of LIN and at 1641 cm −1 due to >CO group of VA. The 1 H‐NMR spectrum shows peaks at 7.0–7.7 δ due to hydroxy proton of LIN and at 1.0–1.4 δ due to acetoxy protons of VA. 13 C‐NMR spectrum of copolymer shows peaks at 167 ppm due to acetoxy group and at 75–77 ppm due to COH group. The Alfrey–Price Q–e parameters for LIN has been calculated as Q 2 = 1.24 and e 2 = 3.11. The copolymer is highly thermally stable and has a glass transition temperature ( T g ) of 85°C, evaluated from DSC studies. The mechanism of copolymerization has been elucidated. This article also reports measurement of Mark–Houwink constants in THF at 25°C by means of GPC as α = 0.8 and K = 3.0 × 10 −4 dl/g. The thermal decompositions of copolymer are established with the help of TGA technique. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1134–1143, 2004