Article
Engineering, Chemical
Yiqiang Wu, Yan Qing, Hui Wan, Xingong Li, Xianjun Li, Yan Wang, Ming Liu, Shoulu Yang
Summary: Hybrid resins composed of polymeric 4-4 diphenyl methane diisocyanate (pMDI) and used urea-formaldehyde (UUF) resins were prepared and studied. The hybrid resins showed even distribution of high ratios of pMDI in UUF resins, resulting in improved curing dynamics and shear strength compared to UUF resin. The study provided a new method for modifying UF resin and demonstrated the feasibility of using hybrid resins in wood-based composites manufacturing.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2023)
Article
Polymer Science
Xiaoxing Yan, Yan Han, Taiyu Yin
Summary: The study fabricated microcapsules for self-repairing waterborne coatings at room temperature, and found that adjusting the ratio of core materials to shell material and the content of microcapsules can significantly improve the coating effect and surface smoothness of waterborne coatings, as well as enhance the aging resistance and overall performance of the film.
Article
Materials Science, Paper & Wood
Mirela Angelita Artner, Pedro Henrique Gonzalez de Cademartori, Francisco Avelino, Diego Lomonaco, Washington Luiz Esteves Magalhaes
Summary: The study investigated the use of methanediol-based cellulose microfibril suspensions to enhance urea-formaldehyde resins, which resulted in improved resin performance and reduced environmental impact.
Article
Polymer Science
Jingbiao Song, Shiwei Chen, Xibin Yi, Xinfu Zhao, Jing Zhang, Xiaochan Liu, Benxue Liu
Summary: Low-cost UF/HNTs nanocomposite adhesive was successfully prepared via in situ polymerization. Modified HNTs were well dispersed in the resin, leading to improved thermal stability, reduced formaldehyde emission, and enhanced water resistance of the nanocomposite. The study proposed a mechanism for the nanocomposites based on reactive HNTs and can provide insights for preparing other polymer/clay nanocomposites.
Article
Polymer Science
Jehan Kothari, Jude O. O. Iroh
Summary: Smart coatings and smart polymers with self-restoring, self-cleaning, and self-healing characteristics have gained attention. However, most self-healing materials have a low glass transition temperature (T-g) and cannot repair advanced composites effectively. This study prepared moderate to high temperature self-healing microcapsules that can stop crack propagation. The microcapsules were prepared using a two-step process involving poly(urea formaldehyde) (PUF) prepolymer synthesis and hexamethylene diisocyanate (HDI) encapsulation in a crosslinked PUF shell. Successful encapsulation was confirmed by FTIR and optical microscopy. TGA and DMA analyses showed improved thermal stability and char retention of the composite, with a higher T-g compared to neat epoxy.
Article
Environmental Sciences
Mohammad Manafi-Dastjerdi, Abbas Rohani, Hamid Zarea Hosseinabadi, Mohammadali Ebrahimi-Nik
Summary: This study investigated the quality and performance of OSB as a finish floor material and found that OSB panels with urea formaldehyde resin and garden tree toppings performed the best. Additionally, the study highlighted the potential of using waste materials from urban and garden tree toppings to produce sustainable and cost-effective OSB finish floors.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Thermodynamics
Suzana Samarzija-Jovanovic, Vojislav Jovanovic, Tijana Jovanovic, Branka Petkovic, Gordana Markovic, Slavica Porobic, Milena Marinovic-Cincovic
Summary: This study examines the thermal and hydrolytic properties of composite systems based on urea-formaldehyde resin and eco-friendly montmorillonite. Experimental results show that the activation of montmorillonite can increase the specific surface area and reduce the amount of free formaldehyde, improving the performance of the composite system.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Forestry
Zhenyu Wei, Xiangnan Kong, Bin Jia, Shitao Xia, Shuguang Han
Summary: Nanofluid MUF resin adhesives, prepared by dispersing SiO2 and TiO2 nanoparticles into the MUF resin, showed improved thermal conductivity and reduced formaldehyde emissions. The addition of nanoparticles increased viscosity, decreased curing time, and lowered free formaldehyde content. These nanofluid adhesives exhibited higher bonding strengths and lower formaldehyde emissions in plywood manufacturing, allowing for reduced hot-pressing temperature or shortened hot-pressing time.
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2023)
Article
Materials Science, Paper & Wood
Leila Asadi Khorramabadi, Rabi Behrooz, Saeed Kazemi
Summary: This study investigated the effect of adding nanoclay and nanoclay modified with APTES as scavengers on the formaldehyde emission and the properties of urea-formaldehyde resin. The results showed that the addition of nanoclay and modified nanoclay reduced formaldehyde emission, improved the physical and mechanical properties, and enhanced the thermal stability of the resin.
Article
Energy & Fuels
Xiaoteng Li, Siyi Luo, Zongliang Zuo, Weiwei Zhang, Dongdong Ren
Summary: TG-FTIR and PY-GC/MS were used to analyze the pyrolysis behaviors of pine wood, urea-formaldehyde resin (UF resin) and their blended pellets. The pyrolysis process was divided into water evaporation, devolatilization, and pyrolysis residue decomposition stages. The addition of UF resin hindered the thermal decomposition of lignin-produced residues and shifted the decomposition temperature to lower values. CO2 was the main product of pyrolysis, while UF resin contributed to nitrogen-containing compounds production. Co-pyrolysis resulted in more nitrogen compounds and promoted the decomposition of macromolecule derivatives, lipids, and ketones.
Article
Engineering, Chemical
Ali Dorieh, Afrasyab Khan, Peyman Pouresmaeel Selakjani, Antonio Pizzi, Amir Hasankhah, Mojtaba Meraj, Omid Pirouzram, Mohadese Niksefat Abatari, Sogand Ghafari Movahed
Summary: This study successfully developed a novel approach for the recovery of wood leachate industrial waste as a catalyst for the synthesis of UF adhesives for MDF panels. The experiments showed that the direct reuse of fiberboard industrial leachate was environmentally friendly and sustainable, providing a base for future work on the recycling and reuse of MDF waste.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2021)
Article
Polymer Science
Lulu Liang, Yu Zheng, Yitian Wu, Jin Yang, Jiajie Wang, Yingjie Tao, Lanze Li, Chaoliang Ma, Yajun Pang, Hao Chen, Hongwei Yu, Zhehong Shen
Summary: By using a surfactant-induced reconfiguration of urea-formaldehyde resins, the interface with bamboo was enhanced, significantly improving its gluability and decreasing the amount of glue spread. This method offers an effective way to reduce the application of petroleum-based resins, lowering production costs and expanding the application fields of UF resin.
Article
Materials Science, Paper & Wood
Tomas Pipiska, Zuzana Paschova, Pavel Kral, Marek Nociar, An Cervenka, Marcus Meyer, Rupert Wimmer
Summary: Agricultural resources, such as hay, have the potential to be a substitute or replacement for wood, especially in countries with limited wood resources or during times of economic instability in the wood market. Previous research has explored various sources but had not considered hay. By soaking in NaOH, the bondability of hay can be improved for manufacturing panel products. This study found that treated hay panels had improved density profiles, higher equilibrium moisture content, and enhanced bending properties compared to untreated hay panels.
Article
Polymer Science
Hanyin Li, Sen Wang, Xiang Zhang, Hao Wu, Yujie Wang, Na Zhou, Zijie Zhao, Chao Wang, Xiaofan Zhang, Xian Wang, Cheng Li
Summary: Soybean meal was used to modify phenol-formaldehyde resin, resulting in soybean meal-phenol-formaldehyde (SMPF) resins. The study investigated the impact of soybean meal on the structural, bonding, and curing properties of PF resin, which are crucial for its applications in the wood industry.
Article
Forestry
Samet Gursoy, Nadir Ayrilmis
Summary: This study investigates the physical properties and mechanical properties of medium density fiberboard (MDF) panels produced using recycled fibers and fresh wood fibers, as well as the effect of kraft lignin modification on the bond strength and mechanical properties of the MDF panels. While replacing fresh fiber with recycled fibers negatively affects the properties of the fiberboard, lignin modification improves the mechanical properties and water resistance, and reduces formaldehyde emission.
