{"title":"Effect of surface treatments on the bond strength between high-performance polymers (PEEK/PEKK) and acrylic resin materials: A systematic review and meta-analysis","authors":"Mahla Khosroabadi , Ebrahim Khosroabadi","doi":"10.1016/j.ijadhadh.2025.104206","DOIUrl":"10.1016/j.ijadhadh.2025.104206","url":null,"abstract":"<div><h3>Objective</h3><div>To quantify the effect of surface-treatment protocols on the bond strength between high-performance polymers—polyetheretherketone (PEEK) and polyetherketoneketone (PEKK)—and acrylic resin materials used in prosthodontics. The review addressed the PICO question: Among in vitro studies on PEEK/PEKK specimens, which mechanical, chemical, or laser surface treatments improve adhesion to acrylic resins compared with untreated surfaces?</div></div><div><h3>Methods</h3><div>Following PRISMA 2020 guidelines (PROSPERO: CRD420251050752), electronic searches of PubMed, Scopus, Web of Science, and Embase were conducted up to June 2024. In vitro studies evaluating bond strength between treated and untreated PEEK/PEKK specimens and acrylic resins were included. Methodological quality was assessed using the Faggion Jr. (2012) tool. Random-effects meta-analysis with subgroup and meta-regression analyses explored sources of heterogeneity.</div></div><div><h3>Results</h3><div>Ten studies involving 1208 specimens met the inclusion criteria. Laser irradiation, sulfuric acid etching, and tribochemical silica coating with silane primer significantly increased bond strength compared with untreated controls (p < 0.001). Although heterogeneity was high (I<sup>2</sup> = 92.8 %), resin type and aging protocol explained part of the variance, whereas differences in testing mode contributed most to residual variability. Most studies showed moderate risk of bias, mainly due to lack of randomization and blinding.</div></div><div><h3>Conclusions</h3><div>Surface modification markedly enhances the adhesion of PEEK and PEKK to acrylic resins. Combined mechanical–chemical or laser-based treatments provide the most consistent improvements. Standardized testing protocols and higher methodological rigor are required to validate these findings.</div></div><div><h3>Clinical significance</h3><div>Optimized surface-conditioning protocols are essential for durable, predictable bonding between high-performance polymers and acrylic resins, enabling broader clinical use of PEEK- and PEKK-based prosthetic frameworks.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"145 ","pages":"Article 104206"},"PeriodicalIF":3.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145577275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jana Kolbe, Stephanie Koesling, Thorben Steinberg, Jona Haupt, Lewin Schröder, Till Vallée, Cordula Grunwald
{"title":"Modified glutine adhesives for structural bonding of glued-in rods in timber engineering","authors":"Jana Kolbe, Stephanie Koesling, Thorben Steinberg, Jona Haupt, Lewin Schröder, Till Vallée, Cordula Grunwald","doi":"10.1016/j.ijadhadh.2025.104164","DOIUrl":"10.1016/j.ijadhadh.2025.104164","url":null,"abstract":"<div><div>The development of sustainable adhesives is becoming an increasingly important topic in timber engineering, as the industry seeks to replace petroleum-based products with bio-based alternatives. Among the natural candidates, glutine adhesives are attractive due to their renewable origin and long history of use, but their application in structural contexts remains limited by poor resistance to moisture and elevated temperatures. This study addresses these weaknesses by investigating straightforward modifications to raw glutine aimed at enhancing its hygrothermal stability. Several strategies were tested, including reducing water content, incorporating fillers such as chalk or sawdust, and adding phenolic cross-linkers (tannic acid, gallic acid, or combinations). Mechanical performance was evaluated at three scales: lap-shear specimens, small-scale glued-in rods, and large-scale glued-in rods. At room temperature, shear strengths of modified glutine adhesives reached values comparable to epoxy references. Under moderate hygrothermal conditions (45 °C/50%–65% RH), formulations such as M31 (chalk + gallic acid) and M35 (chalk + tannic acid) achieved average shear strengths above 6 MPa, showing substantial improvements over the raw reference adhesive. Severe exposure (60 °C/85% RH), however, led to marked reductions in strength, with failure modes shifting from wood tear-out to adhesive failure. The results show that relatively simple modifications can significantly enhance the hygrothermal stability of glutine adhesives and suggest a promising pathway towards sustainable structural bonding. While further studies are required to clarify degradation mechanisms, assess long-term durability, and evaluate scalability, this work demonstrates the potential of modified glutine adhesives as bio-based alternatives in structural timber applications.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"144 ","pages":"Article 104164"},"PeriodicalIF":3.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Bending strength of adhesively-bonded 3D-printed polymer structures","authors":"T.F.R. Ribeiro , F.A.F.S. Magalhães , R.D.S.G. Campilho , R.F.R. Pinto , R.J.B. Rocha , K. Madani","doi":"10.1016/j.ijadhadh.2025.104188","DOIUrl":"10.1016/j.ijadhadh.2025.104188","url":null,"abstract":"<div><div>Often referred to as three-dimensional (3D) printing or 3DP, additive manufacturing (AM) is a growing alternative to conventional fabrication methods such as injection moulding and machining. Rapid prototyping, improved material efficiency, and the ability to create extremely complex geometries are some of its key advantages. Size constraints in AM components, however, continue to be a significant drawback, requiring the joining of smaller printed components to produce complex structures. This study uses additively manufactured polymeric adherends, namely Acrylonitrile Butadiene Styrene (ABS), Polyethylene Terephthalate Glycol-modified (PETG), and Polylactic Acid (PLA), to investigate the structural behaviour of single-lap joints (SLJ) under four-point bending (4 PB). Araldite® 2015 and Sikaforce® 7752 adhesives were used to obtain the bonded joints. Experimental testing was used to determine the adherends’ mechanical characteristics, such as their elastic modulus, plastic deformation characteristics, and fracture behaviour. Failure modes, maximum load (<em>P</em><sub>m</sub>), joint stiffness (<em>k</em><sub>max</sub>), and energy absorption (<em>E</em><sub>max</sub>) were assessed by means of an experimental campaign. The results were compared to predictions made by a Cohesive Zone Model (CZM). The findings highlight how adherend material, adhesive type, and overlap length (<em>L</em><sub>O</sub>) all significantly affect joint performance. The Sikaforce® 7752/PLA combination exhibited the highest <em>P</em><sub>m</sub> and <em>E</em><sub>max</sub> (161 N and 1.58 J, respectively), while PLA bonded with the Araldite® 2015 showed the highest <em>k</em><sub>max</sub> (10.29 N/mm), in all cases with the highest <em>L</em><sub>O</sub> studied of 20 mm.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"144 ","pages":"Article 104188"},"PeriodicalIF":3.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145360508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Safaei, M. Carboni, L.M. Martulli, A. Bernasconi
{"title":"Application of the Cohesive Sequential Static Fatigue algorithm to bonded joints considering the load-ratio effect","authors":"S. Safaei, M. Carboni, L.M. Martulli, A. Bernasconi","doi":"10.1016/j.ijadhadh.2025.104178","DOIUrl":"10.1016/j.ijadhadh.2025.104178","url":null,"abstract":"<div><div>Debonding under fatigue loading is a common failure mode in adhesively bonded joints, where the load ratio (<em>R</em>-ratio) can significantly affect crack propagation behaviour. Accurately predicting fatigue crack growth, including the influence of the <em>R</em>-ratio, is crucial to ensure the safety and long-term reliability of these joints in structural applications. The objective of this study is to adapt the Cohesive–Sequential Static Fatigue (C-SSF) method, originally developed for delamination, to adhesively bonded joints under fatigue loading, with a particular focus on assessing its ability to capture the influence of the <em>R</em>-ratio. Published experimental results for Mode I and Mode II loading conditions are used to validate the accuracy of the C-SSF method in modelling fatigue-induced debonding across different <em>R</em>-ratios. The results demonstrate that the C-SSF method consistently captures the influence of the <em>R</em>-ratio on fatigue crack growth in adhesively bonded joints under both Mode I and Mode II loading conditions. Additionally, a numerical exercise is conducted on a non-standard specimen, revealing that when the maximum load is held constant, the crack growth rate decreases with increasing <em>R</em>-ratio. Overall, the C-SSF method exhibits significant potential as a numerical tool for simulating fatigue crack propagation in adhesively bonded joints under various loading conditions, including different <em>R</em>-ratios.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"144 ","pages":"Article 104178"},"PeriodicalIF":3.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145326825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yu Long , Cui Li , Xiaohang Yu , Tao Zhang , Meng Xin , Guohua Fan , Chuncheng Hao
{"title":"Breaking the trade-off in flame-retardant epoxy resins: A high-crosslinking DOPO additive for simultaneous fire safety and mechanical reinforcement","authors":"Yu Long , Cui Li , Xiaohang Yu , Tao Zhang , Meng Xin , Guohua Fan , Chuncheng Hao","doi":"10.1016/j.ijadhadh.2025.104186","DOIUrl":"10.1016/j.ijadhadh.2025.104186","url":null,"abstract":"<div><div>This study addresses the reduced crosslinking density and diminished thermomechanical properties in traditional DOPO-based flame retardants for epoxy resins due to flexible segments and steric hindrance. A molecular design strategy incorporates the DOPO flame-retardant group into the A1E2PG molecule, which has high epoxy density and a rigid structure, via an addition reaction. This produces a novel flame retardant, D-E2PG, combining dual epoxy active sites with phosphorus-based flame-retardant functionality. The effects of D-E2PG on thermomechanical, dielectric, and flame-retardant properties are investigated using curing kinetics, DMA, tensile testing, and CCT. Results show that at 15 phr D-E2PG, the cured resin's Tg increases from 149.8 °C to 164.8 °C, tensile strength rises by 21 %, and crosslinking density improves by 50 %. The dielectric constant (at 1 MHz) decreases to 3.3, and dielectric loss reduces by 48.4 %. Flame-retardant performance significantly improves, with LOI reaching 32.4 %, UL-94 achieving V-0 grade, PHRR decreasing by 54.4 %, and THR reducing by 37.4 %. This system resolves performance degradation issues through synergy between high crosslinking density, a rigid aromatic ring, and phosphorus-based flame-retardant groups, offering a new approach for designing high-performance flame-retardant epoxy resins.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"144 ","pages":"Article 104186"},"PeriodicalIF":3.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145360509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Maudiela Isabel Arita Torres , Gabriel Freitas Pereira , Nicole Escórcio de Meneses , Ana Letícia Daniel Fontenele , Bruna dos Santos Honório Tonin , Regina Guenka Palma-Dibb , Adriano Lincoln Albuquerque Mattos , Karina Matthes de Freitas Pontes , Raniel Fernandes Peixoto
{"title":"Effect of a self-etching ceramic primer on the surface, mechanical, and adhesive properties of lithium disilicate-based glass-ceramics bonded to different substrates","authors":"Maudiela Isabel Arita Torres , Gabriel Freitas Pereira , Nicole Escórcio de Meneses , Ana Letícia Daniel Fontenele , Bruna dos Santos Honório Tonin , Regina Guenka Palma-Dibb , Adriano Lincoln Albuquerque Mattos , Karina Matthes de Freitas Pontes , Raniel Fernandes Peixoto","doi":"10.1016/j.ijadhadh.2025.104200","DOIUrl":"10.1016/j.ijadhadh.2025.104200","url":null,"abstract":"<div><div>This laboratory study evaluated the effect of a self-etching ceramic primer (Monobond Etch & Prime – MEP), with or without grit blasting, on the surface, mechanical, and adhesive properties of lithium disilicate (LD) ceramics, compared to hydrofluoric acid and silane (HF + S). LD specimens were prepared in two geometries: square-shaped (10 mm × 10 mm × 4 mm) for surface roughness (ΔS<sub>a</sub>, μm), contact angle (CA), microtensile bond strength (μTBS), and scanning electron microscopy (SEM); and rectangular-shaped (15 mm × 2.5 mm × 1.5 mm) for three-point flexural strength (σf3P). Four groups were tested: HF + S grit-blasted (HF + S[g]), HF + S polished (HF + S[p]), MEP[g], and MEP[p]. After treatment, ΔS<sub>a</sub>, CA, and σf3P were measured. LD blocks were cemented to composite or dentin to evaluate μTBS before and after thermocycling (TC, 10,000 cycles, 5 °C/55 °C, 30 s dwell time). Grit blasting significantly increased ΔS<sub>a</sub> (HF + S[g]: 1.16 ± 0.12; MEP[g]: 0.85 ± 0.02) compared to polished specimens (HF + S[p]: 0.47 ± 0.04; MEP[p]: 0.38 ± 0.04), with the lowest CA observed in MEP[g] (27.50 ± 4.09°). HF + S-treated groups showed the lowest σf3P. TC reduced μTBS in all groups, but MEP-treated specimens exhibited greater adhesive stability (ΔμTBS ≤2.0 MPa). Grit-blasted surfaces showed higher μTBS than polished ones. HF + S and MEP performed similarly, except on composite before TC, where HF + S was superior. In conclusion, MEP[g] demonstrated μTBS comparable to HF + S, provided greater adhesive stability after TC, enhanced wettability, better preserved σf3P, reduced ΔS<sub>a</sub>, and showed consistent μTBS to resin cement on both dentin and composite substrates, supporting its effectiveness as a reliable surface treatment for LD ceramics.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"144 ","pages":"Article 104200"},"PeriodicalIF":3.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145463759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"T-peeling behavior of LiFePO4 electrode interfaces in lithium-ion batteries","authors":"Shaohai Dong , Siyu Gu , Bin Jiang , Zhan-Sheng Guo","doi":"10.1016/j.ijadhadh.2025.104179","DOIUrl":"10.1016/j.ijadhadh.2025.104179","url":null,"abstract":"<div><div>Cycling-induced interfacial delamination severely compromises the durability of lithium-ion batteries, highlighting the critical need for accurate assessment of electrode adhesion. To address this, an optimized T-peeling test method was introduced in which symmetric clamping of the free ends and a downward constraint orientation reduce data variability. The optimized method was employed on LiFePO<sub>4</sub> electrodes across a peeling rate range of 5–100 mm/min. Macro-imaging, scanning electron microscopy analysis, and energy-dispersive X-ray spectroscopy elemental mapping confirm interfacial fracture at the active layer/current collector interface as the exclusive failure mechanism during steady-state peeling. By integrating peeling theory with T-peeling load-displacement curve analysis, the steady-state peeling load (with a mean value of 0.18 N) is insensitive to peeling rates within the tested range, with a fracture energy of 24.1 N/m consistent with literature values. Finite element simulations corroborate the experimental peeling behavior. These findings establish T-peeling as a reliable method for interfacial adhesion characterization in battery research and provide electrode design guidelines.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"144 ","pages":"Article 104179"},"PeriodicalIF":3.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145360505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Formulation and solution of functionally graded adhesive joints","authors":"Yesim Kokner, Feridun Delale","doi":"10.1016/j.ijadhadh.2025.104194","DOIUrl":"10.1016/j.ijadhadh.2025.104194","url":null,"abstract":"<div><div>In this paper, the formulation of functionally graded adhesively bonded joints under various loading conditions is considered. The adherends are modeled as composite plates, and the adhesive is modeled as a coupled tension-shear spring with the elastic modulus varying exponentially along the bond line. First, the formulation of the joint under axial, shearing, and bending loads is given in terms of coupled differential equations with variable coefficients for the shear and normal stresses. Next, the solution for the shear and normal stresses is expressed in terms of infinite power series with constant coefficients. Finally, an example, the problem of a single lap joint with the same adherends and subjected to tensile and bending loads, is solved, and the shear and normal stresses are calculated. A finite element (FE) model for functionally graded joints is also developed, and the results are compared with those obtained analytically. There is good agreement between the stresses obtained analytically and using the FE model. It is concluded that the numerical solution based on the formulation presented in this paper gives reasonably accurate results and can be used with confidence to determine both the shear and normal stresses in functionally graded adhesively bonded joints.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"144 ","pages":"Article 104194"},"PeriodicalIF":3.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Multifunctional strontium-MOFs-based dental adhesive: Innovation for enhanced bonding performance and bioactivity","authors":"Suphannikar Matphang , Natapat Aueboonprasert , Ramida Rattanakam , Chayada Teanchai , Chomdao Sinthuvanich , Jakrada Attarataya , Matthuros Sonthisathaporn , Khrongkhwan Akkarachaneeyakorn","doi":"10.1016/j.ijadhadh.2025.104189","DOIUrl":"10.1016/j.ijadhadh.2025.104189","url":null,"abstract":"<div><div>Dental adhesives are primarily designed for durable adhesion between restorative materials and tooth structures. In addition to their bonding function, formulations increasingly incorporate bioactive fillers that promote remineralization, prevent secondary caries, and prolong the longevity of restorations. In this in <em>vitro</em> study, a novel bioactive dental adhesive was developed using strontium-based metal-organic frameworks (Sr-MOFs) with fumarate ligands as functional nanofillers. The incorporation of 0.5 wt% Sr-MOFs significantly improved the micro-tensile bond strength to 27.04 ± 6.53 MPa (p < 0.05) compared to the control, while maintaining its performance after 6 months of aging. Nanoleakage assessments confirmed superior sealing and reduced silver nitrate penetration, attributed to the nano-sized Sr-MOFs and chemical interaction between the fumarate's carboxylate groups and calcium in dentin. The adhesive also demonstrated remineralization capabilities through the deposition of apatite-like minerals when immersed in SBF. Additionally, non-cytotoxic behavior was observed, with cell viability exceeding 70 % under ISO 10993 guidelines. These findings highlight Sr-MOFs with fumarate as a promising filler for dental adhesives, supporting durable bonding and mineral regeneration for long-term restoration success. Further in <em>vivo</em> validation is required to demonstrate the clinical significance and practical application of these findings.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"144 ","pages":"Article 104189"},"PeriodicalIF":3.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Guayule resin as a bio-based modifier for soy protein adhesive systems","authors":"Sarocha Pradyawong, Kimberly Ogden","doi":"10.1016/j.ijadhadh.2025.104195","DOIUrl":"10.1016/j.ijadhadh.2025.104195","url":null,"abstract":"<div><div>Guayule (<em>Parthenium argentatum</em>) is a promising source of natural rubber. It is a semi-arid perennial shrub native to the Southwest part of the United States and Mexico. Unfortunately, one of the reasons guayule rubber has not been commercialized is because there currently are no markets for the potential coproducts. Finding markets for the guayule resin and bagasse would greatly strengthen the economics of guayule rubber production. Hence, the aim of this preliminary study was to develop a new application for guayule resin as an additive for soy protein (SP) adhesives to increase the wet tensile strength. The resin was modified with NaOH in hexane, acetone, and water solutions, and subsequently mixed with soy protein adhesive at different concentrations. An addition of 7.5 % resin to soy protein adhesive showed the highest elastic modulus representing the highest intermolecular interactions. The highest water resistance was also observed for soy protein blended with 7.5 % resin. The wet adhesion strength significantly increased by 70 % compared to pure soy protein adhesive. Differential scanning calorimetry suggested that guayule resin strengthened soy protein network by interacting with 7S and 11S subunits of SP. The changes in soy protein properties were due to the interactions between guayule resin and protein's backbone and side chains. This study demonstrates the potential to utilize guayule resin as a bio-adhesive for wood industries.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"144 ","pages":"Article 104195"},"PeriodicalIF":3.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145360506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}