木材热塑化

利用适当的化学改性反应特别是经典的纤维索改性反应如酯化、醚化反应对木材进行化学改性，可使木材转化为可熔、可溶的新型热塑性高分子材料。这种热塑性木材可用普通塑料加工成型的方法进行加工，制造出许多新产品。为扩大木材的加工方法、劣废木材资源更有效的综合利用及提高木材的应用价值开辟了新的途径。放已成为近十年来木材综合利用新技术研究开发的新热点之一。本文综述这一研究领域的现状。     

Interface morphology and thermoplasticization behavior of bamboo fibers benzylated with benzyl chloride

In this study, benzylated bamboo flour (BBF) was synthesized using benzyl chloride under mild conditions. This material can be added to medium density polyethylene (MDPE) as a reinforcing filler material. The crystal structure and properties of the BBF and corresponding BBF/MDPE panels were investigated by Fourier transform infrared spectroscopy, X‐ray diffraction, scanning electron microscopy, energy dispersive X‐ray spectroscopy, mechanical tests and surface hydrophobicity measurements, and the obtained results are in good agreement. According to the scanning electron microscopy and X‐ray diffraction investigations, the crystal structure of the bamboo material disappeared after the addition of benzyl chloride. The Fourier transform infrared spectroscopy analysis provided further evidence for the successful benzylation. The intensity of the bands attributed to the O—H stretching or deformation vibrations decreased, and the intensity of the bands attributed to the C = O and C—O bonds in the benzyl group increased, which was confirmed by the X‐ray spectroscopy analysis. The volume fraction of the dispersed phase increased dramatically, and the interfacial fusion between the BBF particles and the MDPE matrix improved. The tensile strength and flexural strength of the prepared BBF/MDPE panels were up to 24.21% and 26.73% higher, respectively, compared with panels fabricated from unmodified bamboo flour. Furthermore, the surface hydrophobicity was found to be higher, which confirmed the good interface fusion. The strengthening mechanism is discussed in this paper, and the overall results suggest that BBF is a promising candidate material for the substitution of traditional wood fibers and unmodified bamboo flour in wood plastic composites. Copyright © 2015 John Wiley & Sons, Ltd.