Using UV-Microscopy to Study Diffusion of Melamine-Urea-Formaldehyde Resin in Cell Walls of Spruce Wood

Holzforschung ◽  
2002 ◽  
Vol 56 (1) ◽  
pp. 103-107 ◽  
Author(s):  
Wolfgang Gindl ◽  
Eugenia Dessipri ◽  
Rupert Wimmer
Keyword(s):  
Cell Wall ◽  
Cell Walls ◽  
Quantitative Estimate ◽  
Wood Cell Wall ◽  
Urea Formaldehyde ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Melamine Resin ◽  
Spruce Wood ◽  
Absorbance Spectra

Summary Using UV-microscopy, absorbance spectra of a cured melamine-urea-formaldehyde resin and secondary cell walls of spruce wood glued with this resin were determined. Analysis of the spectra showed that peaks characteristic for both coniferous lignin and melamine resin were present in cell walls of tracheids embedded in the resin. A quantitative estimate indicated a melamine content of the resin embedded cell walls of 6.2%. It could be demonstrated that UV-microscopy is well suited for the investigation of resin diffusion into the wood cell wall.

Effect of plasma treatment on cell-wall adhesion of urea-formaldehyde resin revealed by nanoindentation

Holzforschung ◽  
2014 ◽  
Vol 68 (6) ◽  
pp. 707-712 ◽  
Author(s):  
Johannes Konnerth ◽  
Martin Weigl ◽  
Wolfgang Gindl-Altmutter ◽  
Georg Avramidis ◽  
Arndt Wolkenhauer ◽  
...  
Keyword(s):  
Cell Wall ◽  
Bond Strength ◽  
Mechanical Performance ◽  
Urea Formaldehyde ◽  
Primary Source ◽  
Formaldehyde Resin ◽  
Bond Performance ◽  
Spruce Wood ◽  
Wood Surfaces ◽  
Reference Samples

Abstract Spruce wood surfaces were treated with plasma with the aim of increacing either hydrophilicity or hydrophobicity. The treatments resulted in significant changes in wettability compared to aged and reference samples. Wettability was found to be a very good indicator of macroscopic bond strength. Nanoindentation adhesion measurements identified significant changes in adhesion at the immediate wood surface as a primary source of changes of bond performance, whereas mechanical performance of bulk wood cells was not affected.

In situ identification of the molecular-scale interactions of phenol-formaldehyde resin and wood cell walls using infrared nanospectroscopy

RSC Advances ◽  
2016 ◽  
Vol 6 (80) ◽  
pp. 76318-76324 ◽  
Author(s):  
Xinzhou Wang ◽  
Yuhe Deng ◽  
Yanjun Li ◽  
Kevin Kjoller ◽  
Anirban Roy ◽  
...  
Keyword(s):  
Cell Wall ◽  
Infrared Spectroscopy ◽  
Cell Walls ◽  
Wood Cell Wall ◽  
Phenol Formaldehyde ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Atomic Force ◽  
Molecular Scale

Atomic force microscope infrared spectroscopy (AFM-IR), contact resonance AFM (CR-AFM) measurement, and nanoindentation were combined to identify the interactions between wood cell wall and phenol-formaldehyde resin (PF) on the nanoscale.

scholarly journals Effects of Three Biomass Fillers on the Properties of Melamine Modified Urea-Formaldehyde Resin

2020 ◽  
Vol 782 ◽  
pp. 022077
Author(s):  
Shanfeng Xu ◽  
Sanshan Xia ◽  
Yuzhu Chen ◽  
Hui Xiao ◽  
Maoyu Yi ◽  
...  
Keyword(s):  
Urea Formaldehyde ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Modified Urea

scholarly journals Calcium carbonate modified urea–formaldehyde resin adhesive for strength enhanced medium density fiberboard production

RSC Advances ◽  
2021 ◽  
Vol 11 (40) ◽  
pp. 25010-25017
Author(s):  
Li Lu ◽  
Yan Wang ◽  
Tianhua Li ◽  
Supeng Wang ◽  
Shoulu Yang ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Urea Formaldehyde ◽  
Medium Density Fiberboard ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Medium Density ◽  
Ionic Bond ◽  
Resin Adhesive ◽  
Uf Resin ◽  
Modified Urea

Reactions between CaCO3 and CH2O2 during polycondensation of UF resin produce Ca2+. Ionic bond complexation binds Ca2+ with UF resin. The UF resin crystalline percentage decreases from 26.86% to 22.71%. IB strength of resin bonded fiberboard increases from 0.75 to 0.94 MPa.

Effect of spent sulfite liquor on urea-formaldehyde resin performance

2018 ◽  
Vol 136 (17) ◽  
pp. 47389 ◽  
Author(s):  
Ana Maria Ferreira ◽  
João Pereira ◽  
Margarida Almeida ◽  
João Ferra ◽  
Nádia Paiva ◽  
...  
Keyword(s):  
Urea Formaldehyde ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Spent Sulfite Liquor

Preparation and Characterization of Hexadecane Microcapsule Phase Change Materials by In Situ Polymerization

2013 ◽  
Vol 815 ◽  
pp. 367-370 ◽  
Author(s):  
Xiao Qiu Song ◽  
Yue Xia Li ◽  
Jing Wen Wang
Keyword(s):  
Particle Size ◽  
Phase Change ◽  
Phase Change Materials ◽  
In Situ Polymerization ◽  
Urea Formaldehyde ◽  
Agitation Speed ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Mass Ratio

Hexadecane microcapsule phase change materials were prepared by the in-situ polymerization method using hexadecane as core materials, urea-formaldehyde resin and urea-formaldehyde resin modified with melamine as shell materials respectively. Effect of melamine on the properties of microcapsules was studied by FTIR, biomicroscopy (UBM), TGA and HPLC. The influences of system concentration, agitation speed and mass ratio of wall to core were also investigated. The results indicated that hexadecane was successfully coated by the two types of shell materials. The addition of melamine into the urea-formaldehyde resin microcapsule reduced microcapsule particle size and microencapsulation efficiency. The influences of factors such as system concentration, agitation speed and mass ratio of wall to core to different wall materials microcapsules presented different variety trends of the microcapsule particle size.

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