Article
Polymer Science
Lei Du, Zhenzhen Liu, Zhixiong Ye, Xiaolong Hao, Rongxian Ou, Tao Liu, Qingwen Wang
Summary: In this study, a high-performance and self-healing bio-based polyurethane hot-melt adhesive (DPU) was successfully developed. The adhesive showed high lap shear strength and biomass content, along with excellent self-healing and repeatable adhesion properties. It also exhibited excellent resistance to low temperatures and solvents, making it a promising alternative to conventional PU-HMAs.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Construction & Building Technology
Aktham S. Alchaar, Adil K. Al-Tamimi
Summary: This study evaluated the mechanical properties of 3D printed fiber-reinforced concrete mix in different environmental conditions, revealing that high temperature accelerated water evaporation and surface dehydration, and joints in printed parts are detrimental to performance. Flexural strength increased in hot temperatures, indicating good fiber orientation during the printing process.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Chemical
Jing Xue, Jing Wang, Haofei Huang, Ming Wang, Yali Zhang, Lijuan Zhang
Summary: This study investigated the feasibility of using different solvents for preparing hot-melt pressure-sensitive adhesive (HMPSA) solutions, and found that the differences in bond strength after solvent treatment were due to physical reasons rather than chemical reactions. Solvents with similar polarity to toluene were recommended for maintaining the polymer chain relaxation of original HMPSA.
Article
Forestry
Edgars Kuka, Ingeborga Andersone, Nina Kurnosova, Dace Cirule, Bruno Andersons, Maris Danieks
Summary: Impregnation of glued wood products is crucial for outdoor use or building construction, but the timing and method of impregnation can affect bond quality. Specific adhesive application designs can improve impregnation efficiency, but may also impact bond strength of wood specimens.
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2022)
Article
Polymer Science
Weidi Xie, Qiming Yan, Heqing Fu
Summary: Utilizing a rosin-based chain extender in the preparation of polyurethane reactive hot melt adhesive (PURHMA) can enhance thermal and mechanical properties, as well as adhesive performance. Increasing the content of chain extender significantly improves the tensile strength, lap shear strength, and adhesion properties of PURHMA.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2021)
Article
Chemistry, Physical
Josipa Vukelja, Eva Klaric Sever, Ivan Sever, Silvana Jukic Krmek, Zrinka Tarle
Summary: This study aimed to assess the effect of two different adhesive application methods on shear dentin bond strength using three various adhesive systems. It was found that the co-curing method diminished bond reliability, and different application techniques exhibit varying bond strengths to dentin.
Article
Engineering, Chemical
Zhaoyong Lu, Weilan Xue, Zuoxiang Zeng, Zhiyuan Zhou
Summary: The novel phosphorus-nitrogen-containing polyol BHAPE synthesized through Kabachnik-Fields reaction showed enhanced thermal stability and flame retardant properties in HMPURs. Increasing BHAPE content within a certain range can improve the mechanical properties of HMPURs, with an optimal content of 4-6wt%. Furthermore, introducing polycarbonate diol can effectively enhance the hydrolysis resistance of HMPURs.
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Xinyu Wang, Zefei Yuan, Xueyi Pan, Jianbo Li, Qinggang Tan, Jie Ren
Summary: Due to the exhaustion of fossil resources and the degradation of the environment, there is a growing interest in using eco-friendly materials as substitutes for petroleum-derived materials. In this study, a series of poly(& epsilon;-caprolactone-co-lacticacid) diols were synthesized with different lactic acid (LA)/& epsilon;-caprolactone (CL) ratios. The resulting eco-friendly diols were used to produce polyurethane reactive hot-melt adhesives (PURHAs), which showed improved properties such as higher glass transition temperature, crystallinity, and strength compared to non-PCL-containing PURHAs. These bio-based PURHAs have potential applications in various industries.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Applied
Linhe Zhao, Chengyu Hong, Chuanhao Wang, Jiawei Li, Haiwen Ren, Chao Zhou
Summary: A series of Waterborne Polyurethanes (WPUs) were synthesized by utilizing molecular structure design and specific components. The effects of changes in molecular weight and content of certain components on the properties of WPUs were investigated, and it was found that higher hydrogen bond density resulted in improved strength and adhesion. When the content of a specific component reached a certain level, the film exhibited the highest values of strength and adhesion. Therefore, WPUs are suitable for applications requiring high adhesive strength, such as water-based ink binders.
PROGRESS IN ORGANIC COATINGS
(2023)
Review
Polymer Science
Jakub Czakaj, Bogna Sztorch, Eliza Romanczuk-Ruszuk, Dariusz Brzakalski, Robert E. Przekop
Summary: This article presents the current state of the art in the formulation, characterization, and application of hot-melt adhesives (HMAs), with a focus on optimizing their performance using organosilicon compounds. It discusses the use of HMAs in various industries such as automotive, construction, and photovoltaics and outlines future trends in the field.
Article
Polymer Science
Wen Jiang, Reza Hosseinpourpia, Vladimirs Biziks, Sheikh Ali Ahmed, Holger Militz, Stergios Adamopoulos
Summary: Polyurethane adhesives prepared with bio-polyols from wood sawdust liquefaction via acid-catalysis showed varied chemical structure and thermal behavior at different NCO:OH molar ratios, with the highest shear strength observed at a ratio of 1.5:1.
Article
Chemistry, Physical
Pengli Zhang, Bin Zhang, Jiansen Pan, Guoliang Zhang, Chunfeng Ma, Guangzhao Zhang
Summary: A solvent-free and highly cross-linked nonisocyanate polyurethane (NIPU) adhesive with ultrastrong adhesion performance and excellent tolerance to extreme conditions is reported. The adhesive exhibits high adhesion strength, versatility to different substrates, and is able to withstand low temperatures and organic solvents.
CHEMISTRY OF MATERIALS
(2023)
Article
Engineering, Chemical
Pouya Kohnechi, Mohammad Fasihi, Hajar Eshaghi
Summary: A series of thermoplastic polyurethane hot-melt adhesive formulations were synthesized by blending polyether-based thermoplastic polyurethane with nanosilica, C5, and C9 hydrocarbon loadings. Various analyses were conducted to examine the properties of the adhesive formulations. The results showed that the addition of nanosilica improved the tensile properties and T-peel strength with the polyester fabric, while adding C5 and C9 tackifiers had different effects on the adhesive properties. Adhesive formulation with 5 wt% of C5 tackifier had the highest peel strength.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2023)
Article
Biochemistry & Molecular Biology
Vjera Perkovic, Marina Simunovic Anicic, Vanni Lughi, Lucia Pozzan, Senka Mestrovic, Gianluca Turco
Summary: This study compared the bond strength and degree of conversion of two orthodontic bonding systems and found no difference in bond strength, but the two-step system had a higher degree of conversion.
Article
Chemistry, Multidisciplinary
Qing Hong, Alexandra C. Pierre-Bez, Matheus Kury, Mark E. Curtis, Rochelle D. Hiers, Fernando L. Esteban Florez, John C. Mitchell
Summary: Experimental adhesives containing co-doped metaloxide nanoparticles demonstrated strong and long-term antibacterial properties against Streptococcus mutans biofilms. The study characterized the shear-bond strength (SBS) and color stability (CS) of these biomaterials. The experimental materials showed comparable SBS values to the control adhesive and had more stable colors even after 10,000 thermocycles.
Article
Engineering, Environmental
Nadir Ayrilmis, Elif Yurttas, Ali Durmus, Ferhat Ozdemir, Rajini Nagarajan, Mayandi Kalimuthu, Manja Kitek Kuzman
Summary: Researchers produced biocomposite films with technological, thermal, and antimicrobial properties using a bio-reduction method, combining polylactic acid (PLA) and thermally treated wood flour with in situ generated nanosilver particles. The addition of leaf extract had a positive effect on the tensile properties of the films, and films modified with silver nitrate and leaf extract exhibited the highest tensile modulus. Remarkable antimicrobial results were observed, with the biocomposites showing significant clearance zone against E.coli bacteria.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2021)
Article
Polymer Science
Jure Zigon, Mirko Kariz, Matjaz Pavlic
Article
Polymer Science
Mirko Kariz, Dasa Krapez Tomec, Sebastian Dahle, Manja Kitek Kuzman, Milan Sernek, Jure Zigon
Summary: The study investigated the bondability of 3D-printed parts to wood with various surface treatments, finding that plasma treatment significantly improved bond shear strength, with the best results obtained for surfaces that had been both sanded and plasma treated.
Article
Automation & Control Systems
Nadir Ayrilmis, Mirko Kariz, Milan Sernek, Manja Kitek Kuzman
Summary: This study investigated the effects of core configuration on the mechanical properties of additively manufactured wood/PLA specimens. Samples with a hexagonal infill pattern demonstrated the highest mechanical properties, with mechanical properties increasing significantly with higher infill rates. Additionally, specimens with hexagonal cores exhibited the highest rate of elastic recovery after Brinell hardness tests.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Polymer Science
Dasa Krapez Tomec, Ales Straze, Andreas Haider, Mirko Kariz
Summary: The research explores the use of wood particles in FDM printing materials to create moisture-induced shape-changing bilayer actuators, potentially for applications like active facade or ventilation valves. The study shows that the wood content in the composite can cause dimensional changes and shape changes in response to changing climates. The rate and dynamics of shape change depend on the ratio of materials and wood content in the composite, indicating a greater effect with a small amount of added hygromechanically active material.
Article
Materials Science, Paper & Wood
Mirko Kariz, Manja Kitek Kuzman, Milan Sernek
Summary: The study found that artificial ageing caused cracking and delamination of the bonded joints of heat-treated spruce lamellas, as well as a decrease in adhesive bond strength. Delamination was more severe for PVAc adhesive compared to MUF, and increased for both adhesives with higher wood heat treatment temperatures. Additionally, the shear strength of bonds on the exposed side of the samples after artificial weathering was lower than the average strength of the whole sample.
Article
Materials Science, Multidisciplinary
Ismail Ezzaraa, Nadir Ayrilmis, Manja Kitek Kuzman, Soufiane Belhouideg, Jamaa Bengourram
Summary: Analytic modeling of 3D printed natural fiber-reinforced composites is still in its early stages, with mechanical properties playing a crucial role in defining the structural behavior of the material. The elastic properties of wood/PLA composites were predicted using a micromechanical approach and validated through experimental data, showing a good correlation with the Mori-Tanaka model. Furthermore, a parametric study revealed that the elastic properties of the composites were strongly influenced by fiber content, fiber shape, and porosity rate.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Forestry
Joze Kropivsek, Matej Jost, Petra Groselj, Manja Kitek Kuzman, Mirko Kariz, Maks Merela, Dominika Gornik Bucar
Summary: This research developed a model for calculating the cost price of invasive wood products and demonstrated its applicability using a dining table made of black locust wood as an example, showing that invasive wood species have high economic value.
Article
Polymer Science
Jusuf Ibrulj, Ejub Dzaferovic, Murco Obucina, Manja Kitek Kuzman
Summary: This research aims to determine the relaxation and creep modulus of 3D printed materials through experiments and numerical analysis. The study considered the temperature effect on relaxation modulus and used the finite volume method and DMA analysis. The experimental and numerical results showed a good agreement.
Article
Polymer Science
Dasa Krapez Tomec, Mirko Kariz
Summary: Polymers filled with natural-based fillers, including wood particles, have gained increasing demand in additive manufacturing. This article reviews the possibilities and potential of using wood in additive technologies, highlighting its advantages such as low cost, reinforcing ability, biodegradability, and availability.
Article
Materials Science, Paper & Wood
Seid Hajdarevic, Manja Kitek Kuzman, Murco Obucina, Srecko Vratusa, Tomaz Kusar, Mirko Kariz
Summary: In this study, 3D-printed connectors were developed, tested, and numerically analyzed to replace the typical L-shaped joints in chair construction. The experimental results showed that the 3D-printed joints achieved lower strength compared to traditional wooden mortise-and-tenon joints and need to be optimized and reinforced.
WOOD MATERIAL SCIENCE & ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Natasa Knez, Mirko Kariz, Friderik Knez, Nadir Ayrilmis, Manja Kitek Kuzman
Summary: The study investigated the effects of selected printing parameters on the fire properties of additively produced composites from PLA and wood/PLA filaments. Results showed that the incorporation of wood flour into PLA significantly affected the properties of specimens exposed to fire, with PLA specimens exhibiting better reactions to fire and longer time to ignition compared to wood/PLA specimens. Additionally, while the maximal heat release rate was slightly higher in the PLA specimens, the duration of HRR was longer for wood/PLA specimens.
JOURNAL OF RENEWABLE MATERIALS
(2021)
