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Licensed Unlicensed Requires Authentication Published by De Gruyter October 25, 2013

Esterification of wood with citric acid: The catalytic effects of sodium hypophosphite (SHP)

  • Xinhao Feng , Zefang Xiao , Shujuan Sui , Qingwen Wang and Yanjun Xie EMAIL logo
From the journal Holzforschung

Abstract

Sodium hypophosphite (SHP) has been recognized as the most efficient catalyst in the esterification reaction of cellulosic fabrics with citric acid (CA), but both the high cost and the environmentally harmful property of SHP call for optimization of its application. In this study poplar wood (Populus adenopoda Maxim.) was treated with CA to various weight percent gains (WPGs) and the effect of SHP on the resulting properties of treated wood was investigated. Esterification with CA can occur also in the absence of SHP, as evidenced by the resistance to water leaching of CA. Wood treated with CA alone to 36% WPG exhibited 7% bulking, 50% anti-swelling efficiency, 30% reductions of the modulus of rupture, and 50% lower impact strength. Treatments with CA in the presence of SHP provided wood properties comparable to wood treated with CA alone. Thus the application of SHP can be questioned from the point of view of an economic production and environmental protection.


Corresponding author: Yanjun Xie, Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), College of Material Science and Engineering, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, People’s Republic of China, Phone: +86 451 8219 1002, Fax: +86 451 8219 1002, e-mail:

Acknowledgments

The Fundamental Research Funds for the Central Universities of China (DL12DB02) is gratefully acknowledged. Yanjun Xie thanks the support by both the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-11-0608) and the Young Prominent Talent Support Program of Northeast Forestry University (PTSP-1213-03). We also thank PD. Dr. Carsten Mai from Georg-August-University of Goettingen for the valuable comments and suggestions.

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Received: 2013-7-4
Accepted: 2013-10-1
Published Online: 2013-10-25
Published in Print: 2014-5-1

©2014 by Walter de Gruyter Berlin/Boston

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