Tuning of adhesion and disintegration of oxidized starch adhesives for the recycling of medium density fiberboard

Oxidized starch (OS) adhesives with a balance between their adhesion and disintegration properties were prepared by controlling the degree of oxidation and modifying the cross-linker type and level to replace urea-formaldehyde (UF) resins for easy recycling of medium density fiberboard (MDF). Four m...

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Bibliographic Details
Published in:Bioresources 2020-08, Vol.15 (3), p.5156-5178
Main Authors: Lubis, Muhammad Adly Rahandi, Park, Byung-Dae, Hong, Min-Kug
Format: Article
Language:English
Subjects:
Acids
Adhesion
Adhesives
Bond strength
Citric acid
Crosslinking
Density
Disintegration
Formaldehyde
Hydrogen peroxide
Isocyanates
Lignin
Linkages
Manufacturing
Mechanical properties
Oxidation
Physical properties
Polyvinyl alcohol
Recycling
Resins
Sodium
Starch
Urea
Viscosity
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Summary:Oxidized starch (OS) adhesives with a balance between their adhesion and disintegration properties were prepared by controlling the degree of oxidation and modifying the cross-linker type and level to replace urea-formaldehyde (UF) resins for easy recycling of medium density fiberboard (MDF). Four molar ratios of H2O2/starch, two types of cross-linker, i.e., blocked-pMDI (B-pMDI) and citric acid (CA), and three levels of the cross-linkers were employed to tailor the performance of the OS adhesives. The OS reacted with the isocyanate groups from the B-pMDI to form amide linkages, while it formed ester linkages by reacting with the CA. The resulting B-pMDI/OS-bonded MDF had better physical and mechanical properties than the CA/OS-bonded MDF, with comparable adhesion (0.34 MPa) to UF resins and ten times greater degree of fiber disintegration than UF resins. The combination of a 0.5 molar ratio OS with 7.5 wt% of B-pMDI produced MDF exhibiting an optimal balance between adhesion and disintegration, suggesting that such OS adhesives could someday replace UF resins in manufacturing and recycling of MDF without formaldehyde emission.
ISSN:1930-2126
1930-2126
DOI:10.15376/biores.15.3.5156-5178