The lsolation of Graft Copolymer from Larix leptolepis-Methyl Methacrylate Wood-Plastic Combination

Abstract

For the purpose of the improvements of Karamatsu wood, methyl methacrylate (MMA) was polymerized in the presence of Karamatsu wood(20-20-15 mm) by heating method and Karamatsu wood-plastic combination (WPC) was prepared.
The poly(methyl methacrylate)(PMMA) homopolymer whih was obtained in 42% yields, was removed by acetone extraction, and graft WPC was obtained in 10.9% yields.
The graft copolymer of lignin and PMMA was isolated by chlorine dioxide oxidation of the graft WPC which remained at the acetone extraction. The graft copolymer of holocellulose and PMMA was isolated by extraction with copper-ethylenedfamine solution from the graft WPC which remained at the extraction.
The graft copolymers were examined by infrared spectroscopy(IR) and differential thermalgas chromatography(DT-GC).
It was confirmed that PMMA graft-copolymerized onto lignin and holocellulose., The graft copolymer of lignin and PMMA in Karamatsu was 3.5%o (composition lignin (54, 3%) and PMMA (45.7%)). Also, the graft copolymer of, holocellulese and PMMA in Karamatsg. was 17.4%(hQlocellulose (48.2%) and PMMA (51.8%)). That is to say, 82.5% of the grafted'PMMA was onto holocellulose and 14.6% onto lignin in Karamatsu.
Furthermore, it was indicated that the degree of polymerization(DP) of PMMA which was'grafted onto lignin and holocellulose was considerably lower that than of the homopolymer(DP'17000).