4.6 Article

Investigation of Novel Thermosetting Copolymer-Based Monomethylolurea-Glyoxal for Wood Manufacturing

Journal

ACS OMEGA
Volume 7, Issue 39, Pages 35055-35062

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsomega.2c03864

Keywords

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Funding

  1. National Natural Science Foundation of China [32160346, 31870546]
  2. Yunnan Provincial Natural Science Foundation [2019FA012]
  3. 111 project [D21027]

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The purpose of this investigation was to design novel alternating copolymers as adhesives for wood manufacturing. The MMU-G resins showed excellent water resistance and long storage stability, which are different from those of UF adhesives. After a 120-day storage period, the plywood produced with MMU-G resins still exhibited good wet shear strength.
The purpose of this investigation was to design novel alternating copolymers (monomethylolurea-glyoxal, MMU- G) as adhesives for wood manufacturing. MMU-G were synthesized under acid (pH = 5) conditions. After the 120-day storage period, the MMU-G resins were used for plywood production, which exhibited a wet shear strength of about 2.15 MPa, similar to the freshly prepared MMU-G resin. The excellent water resistance and long storage stability showed that MMU-G has particular characteristics and properties all of their own, which, in certain respects, are very different from those of urea-formaldehyde (UF) adhesives. The X-ray diffraction results showed that only a few crystallinities occurred in MMU-G resins, indicating the presence of long side chains in the MMU-G polymer structures, leading to better adhesion strength than UF resins. The structure characteristics of the MMU-G resin were studied by Fourier transform infrared and electrospray ionization mass spectrometry, and a possible molecular structure has been inferred, which is consistent with spectroscopic results.

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