IR studies of wood plastic composites

Abstract

SYNOPSISWood plastic composites ( WPC) of simul were prepared by gamma radiation using butylacrylate (BA) and methylmethacrylate (MMA) as the monomer and methanol as the swelling agent at 9 : 1 ( v / v ) ratio. IR spectra of simul, bulk polymer of BA (or MMA) film, and WPC of different polymer loadings ranging from 18 to 115% were studied. Increase of the characteristic peak intensity at 1735 cm-' (C = 0 vibration for acetyl groups) over that of 1620 cm-' (conjugated aryl carbonyl groups) along with the increase of polymer loading of simul with the monomer indicates that the graft copolymerization took place between the monomer and the simul wood matrix. 0 1993 John Wiley & Sons, Inc. I NTRO D UCTl 0 NRecently many authors reported on the wood plastic composites formation using different monomers. Synergistic yields of polymer loading were also reported in the presence of additives.',2 Analysis of composites by X-ray diffraction and scanning electron microscope (SEM) revealed the graft copolymerization of the monomer methylmethacrylate (MMA) with the wood m a t r i~.~ IR spectroscopy is known to elucidate functional groups and linkages in any chemical structure analysis. Recently wood polymer composites of Geronggang, a tropical hard wood of Malaysia were analysed by FTIR spectroscopy.4 It was observed that graft copolymerization occurred with the wood components and acrylonitrile and styrene, but not with MMA. The purpose of the present work is to study the IR spectra of the simul, a soft wood of Bangladesh, and its composites with n -butylacrylate (BA) and MMA in order to determine, in further support of X-ray diffraction and SEM analysis, the extent of copolymerization of simul with BA and MMA.

Banana fibers and microfibrils as lignocellulosic reinforcements in polymer composites

“…Reaction between cellulose and maleic anhydride. and secondary alcohols found in cellulose, hemicellulose, lignin, extractives; and carboxylic acids in extractives (Khan, Idriss Ali, & Basu, 1993;Kolboe & Ellefsen, 1962). The absorption band near the OH stretching vibrations, at 2918 and 2904 cm −1 for BF and BMF, respectively, may be associated to CH stretching vibrations.…”

Comparison of alkaline pulping with steam explosion for glucose production from rice straw

“…The absorption band at the region of 3422 and 3345 cm −1 , may be due to various hydroxyl (OH) stretching vibrations. The OH compounds may include absorbed water, aliphatic primary and secondary alcohols found in cellulose, hemicellulose, lignin, extractives; and carboxylic acids in extractives (Khan, Idriss Ali, & Basu, 1993;Kolboe & Ellefsen, 1962). The absorption band near the OH stretching vibrations, at 2918 and 2904 cm −1 may be associated with CH stretching vibrations.…”

Laccase Production and Enzymatic Modification of Lignin by a Novel Peniophora sp.

“…8, 9 and 10) which may be attributed to C-H stretching vibrations of the methoxyl group [21,40]. [21,41].…”