Today's KNOWLEDGE Share : Researchers develop a reusable HMA made from xylan

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Today's KNOWLEDGE Share

Researchers develop a reusable HMA made from xylan

Professor Peng Feng's team from the School of Materials Science and Technology of Beijing Forestry University developed a high-performance, reusable bio-based hot melt adhesive (XA) using industrial byproduct crystalline xylan as raw material. This not only provides innovative ideas for the design of new biomass-based adhesives, but also provides new ideas and technologies for the high-value utilization of hemicellulose.


Xylan-based adhesive outperforms epoxies and EVAs

Xylan hemicellulose is an important natural polymer in plant cell walls, and together with cellulose and lignin, it constitutes the main component of wood fiber biomass. Hemicellulose is the second largest renewable carbohydrate resource after cellulose, and is abundant in crop straw and forest biomass. However, in the production process of pulp and paper industry and bioethanol industry, most of the #hemicellulose is degraded or dissolved after pretreatment, so it cannot be effectively utilized.

 

Professor Peng Feng's team reconstructed the molecules of #xylan through redox reactions, turning it into a new type of hot melt adhesive. The adhesive can be effectively cured under different heating conditions, including simple heating with a hair dryer or heating at 100°C for 5 minutes. 

 

According to tests, the bonding strength between wood substrates can reach about 31 MPa. Its mechanical properties are not only better than traditional petroleum-based commercial #epoxyresins and #EVA (ethylene-vinyl acetate copolymer) #hotmeltadhesives, but also significantly better than the various bio-based adhesives reported so far prepared from biomass such as polysaccharides, proteins and polyphenols. More importantly, the xylan hot melt adhesive exhibits excellent reusability: after 10 heating-cooling curing cycles, its bonding strength can still be maintained at more than 100% of the initial value. 

 

This feature is significantly different from most existing biomass-based adhesives, which are usually not recyclable, thus limiting their sustainability in practical applications.

 

The research work was supported by the National Science Fund for Distinguished Young Scholars, the China Postdoctoral Science Foundation Postdoctoral Fund Project, the National Natural Science Foundation of China and the 111 Program of the Ministry of Education. In addition, it was also supported by the Innovation Platform for High-value Utilization of Forest Resources of #BeijingForestryUniversity.


source : Beijing Forestry University /SpecialChem

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