Improved wet shear strength in eco-friendly starch-cellulosic adhesives for woody composites

Hao Yin; Peitao Zheng; Erbing Zhang; Jiuping Rao; Qiaojia Lin; Mizi Fan; Zhiqiang Zhu; Qinzhi Zeng; Nairong Chen

doi:10.1016/j.carbpol.2020.116884

Improved wet shear strength in eco-friendly starch-cellulosic adhesives for woody composites

Carbohydr Polym. 2020 Dec 15:250:116884. doi: 10.1016/j.carbpol.2020.116884. Epub 2020 Aug 10.

Authors

Hao Yin¹, Peitao Zheng², Erbing Zhang³, Jiuping Rao⁴, Qiaojia Lin⁵, Mizi Fan⁶, Zhiqiang Zhu⁷, Qinzhi Zeng⁸, Nairong Chen⁹

Affiliations

¹ National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials, College of Materials Engineering, Fujian Agriculture and Forestry University, 350002, Fuzhou, China. Electronic address: 759570274@qq.com.
² National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials, College of Materials Engineering, Fujian Agriculture and Forestry University, 350002, Fuzhou, China. Electronic address: fafuzpt@163.com.
³ National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials, College of Materials Engineering, Fujian Agriculture and Forestry University, 350002, Fuzhou, China. Electronic address: 18726081410@163.com.
⁴ National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials, College of Materials Engineering, Fujian Agriculture and Forestry University, 350002, Fuzhou, China. Electronic address: fafurjp@163.com.
⁵ National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials, College of Materials Engineering, Fujian Agriculture and Forestry University, 350002, Fuzhou, China. Electronic address: Linqj208@163.com.
⁶ National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials, College of Materials Engineering, Fujian Agriculture and Forestry University, 350002, Fuzhou, China; College of Engineering, Design and Physical Science, Brunel University London, UB8 3PH, Uxbridge, United Kingdom. Electronic address: Mizi.Fan@brunel.ac.uk.
⁷ National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials, College of Materials Engineering, Fujian Agriculture and Forestry University, 350002, Fuzhou, China. Electronic address: 1597238652@qq.com.
⁸ National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials, College of Materials Engineering, Fujian Agriculture and Forestry University, 350002, Fuzhou, China. Electronic address: fjafuzqz@163.com.
⁹ National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials, College of Materials Engineering, Fujian Agriculture and Forestry University, 350002, Fuzhou, China. Electronic address: fafucnr@163.com.

PMID: 33049825
DOI: 10.1016/j.carbpol.2020.116884

Abstract

Development of eco-friendly adhesives from renewable biomass has attracted considerable attention in recent years. Here, we present a novel approach via combination of waste newspaper (WNP) powder, oxidized glutinous rice starch, and polyamidoamine-epichlorohydrin (PAE) to prepare a formaldehyde-free starch-cellulosic adhesive (SCA) for woody composites. The oxidation treatment made the carboxyl/carbonyl groups more available in starch. Plywood bonded by the optimum SCA with 50 wt% of the WNP powder showed a wet shear strength of 0.83 MPa exceeding that of the oxidized starch adhesive by 130.5 %. During the curing process of SCA, the oxidized starch and WNP fiber participated into the crosslinking reaction with PAE via ester and ether bonds, as evidenced by FTIR analysis. The resulting cured adhesive had enhanced crystalline structures, thermal properties, hydrophobicity, wet-cohesion, rheological properties, and adhesiveness to wood. The SCA showed great potential in wood composites as an alternative to formaldehyde-derived adhesives.

Keywords: Carbohydrate; Formaldehyde-free; Newspaper; Resin; Wood.