Polymer Testing最新文献

Crashworthiness and optimization for foam-filled multi-layer composite lattice structures

IF 5 2区材料科学

Polymer Testing Pub Date : 2025-02-17 DOI: 10.1016/j.polymertesting.2025.108744

Jiye Chen , Wangwang He , Hai Fang , Yong Zhuang , Zhixiong Zhang , Yufeng Zhao

{"title":"Crashworthiness and optimization for foam-filled multi-layer composite lattice structures","authors":"Jiye Chen , Wangwang He , Hai Fang , Yong Zhuang , Zhixiong Zhang , Yufeng Zhao","doi":"10.1016/j.polymertesting.2025.108744","DOIUrl":"10.1016/j.polymertesting.2025.108744","url":null,"abstract":"<div><div>Foam materials have been widely used to fill composite lattice structures to improve energy absorption and mechanical properties. In this paper, several novel types of foam-filled multi-layer composite lattice structures (FMCLSs) were proposed, and their crashworthiness analysis and multi-objective optimization were conducted. The finite element method was adopted to investigate the compressive behavior of the FMCLSs. Quasi-static compression experiments were performed on the FMCLSs manufactured using a vacuum infusion molding process (VIMP) to verify the accuracy of the finite element models. Furthermore, validated finite element models were employed to conduct parametric studies on the FMCLSs. For the FMCLS with double-layer dislocation cells or trapezoidal cells, the crush force efficiency (CFE) achieved average values of 44.86 % or 50.47 %, respectively, which were higher than those of the other types of FMCLSs. To obtain the optimal designs of the FMCLSs, metamodels and the MOPSO algorithm were utilized, with the specific energy absorption (SEA) and peak crushing force (PCF) selected as the two objectives. The optimization results demonstrated that the FMCLSs with double-layer dislocation cells and hexagonal cells had better crashworthiness than the other types of FMCLSs and could serve as effective energy absorbers. Meanwhile, with the PCF constrained to a value greater than 82 kN, the FMCLS with hexagonal cells exhibited the best crashworthiness; whereas, when the PCF was less than 82 kN, the FMCLS with double-layer dislocation cells performed the best. Additionally, the equivalent compressive modulus and compressive strength of the FMCLSs were predicted using a rule of mixtures.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"144 ","pages":"Article 108744"},"PeriodicalIF":5.0,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tailored recycled composites: Enhancing the performance of injection moulded post-consumer polypropylene composites using Box-Behnken Design

IF 5 2区材料科学

Polymer Testing Pub Date : 2025-02-15 DOI: 10.1016/j.polymertesting.2025.108743

Zahra Shahroodi , David Zidar , Vahid Momeni , Florian Arbeiter , Ivica Duretek , Nina Krempl , Gerald Berger-Weber , Clemens Holzer

{"title":"Tailored recycled composites: Enhancing the performance of injection moulded post-consumer polypropylene composites using Box-Behnken Design","authors":"Zahra Shahroodi , David Zidar , Vahid Momeni , Florian Arbeiter , Ivica Duretek , Nina Krempl , Gerald Berger-Weber , Clemens Holzer","doi":"10.1016/j.polymertesting.2025.108743","DOIUrl":"10.1016/j.polymertesting.2025.108743","url":null,"abstract":"<div><div>This study investigates the impact of material composition and processing parameters on glass fibre-reinforced recycled polypropylene (rPP) flakes through mechanical and rheological testing. Using a three-factor, three-level Box-Behnken Design (BBD) within Response Surface Methodology (RSM), the effects of glass fibre flake content, additive content, and extruder screw speed on the properties of injection-moulded samples were evaluated. Analysis of variance (ANOVA) and cross-validation were conducted to assess the influence of these parameters on tensile and rheological properties. The key objective was to maximize tensile modulus (E<sub>t</sub>) without compromising tensile strength. The results showed a 60 % increase in E<sub>t</sub> by optimizing extruder screw speed and flake content, achieving the highest E<sub>t</sub> (4.1 GPa) at a screw speed of 150 rpm, 50 wt% flake content, and 5 wt% additive. The additive contributed up to a 20 % increase in E<sub>t</sub> but primarily influenced rheological behaviour. Glass fibre flake content was the most significant factor affecting mechanical and rheological properties, with additive content enhancing flow characteristics. These findings highlight the potential to optimize glass fibre-reinforced rPP composites for improved performance, offering a sustainable material solution for applications in diverse industries.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"144 ","pages":"Article 108743"},"PeriodicalIF":5.0,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal annealing optimization for improved mechanical performance of PLA parts produced via 3D printing

IF 5 2区材料科学

Polymer Testing Pub Date : 2025-02-11 DOI: 10.1016/j.polymertesting.2025.108735

Çağlar Kahya , Oğuz Tunçel , Onur Çavuşoğlu , Kenan Tüfekci

{"title":"Thermal annealing optimization for improved mechanical performance of PLA parts produced via 3D printing","authors":"Çağlar Kahya , Oğuz Tunçel , Onur Çavuşoğlu , Kenan Tüfekci","doi":"10.1016/j.polymertesting.2025.108735","DOIUrl":"10.1016/j.polymertesting.2025.108735","url":null,"abstract":"<div><div>This study employs an integrated approach using Taguchi, ANOVA, and Grey Relational Analysis to optimize the mechanical performance of PLA parts produced via Fused Filament Fabrication through controlled thermal annealing. The analysis examines the effects of annealing temperature and time on tensile, flexural, compressive, and impact strengths, aiming to identify optimal post-processing conditions for improved material properties. Annealing temperatures ranged from 70 °C to 110 °C, and durations varied between 40 and 200 min. Key findings indicate that the most influential parameters were achieved at 90 °C for 120 min, yielding notable enhancements in tensile strength, flexural strength, compressive strength, and impact resistance. The Taguchi method identified optimal conditions for each mechanical property, with temperature emerging as the most influential factor. ANOVA analysis further quantified the contribution ratio of temperature and time, validating the Taguchi results and confirming that temperature accounted for most of the variation in mechanical performance. Differential Scanning Calorimetry supported these findings, showing increased crystallinity in PLA, thus highlighting the significant impact of optimized thermal annealing on enhancing 3D-printed PLA parts.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"144 ","pages":"Article 108735"},"PeriodicalIF":5.0,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Construction of gradient layered structure for microwave absorbing composite materials with strong absorption and high bandwidth

IF 5 2区材料科学

Polymer Testing Pub Date : 2025-02-10 DOI: 10.1016/j.polymertesting.2025.108729

Mei Guo, Zikang Han, Guangsheng Shi, Rong Chen, Jiang Li, Shaoyun Guo

{"title":"Construction of gradient layered structure for microwave absorbing composite materials with strong absorption and high bandwidth","authors":"Mei Guo, Zikang Han, Guangsheng Shi, Rong Chen, Jiang Li, Shaoyun Guo","doi":"10.1016/j.polymertesting.2025.108729","DOIUrl":"10.1016/j.polymertesting.2025.108729","url":null,"abstract":"<div><div>The unique properties of two-dimensional metal carbides (MXene) make them promising for use in absorbing electromagnetic waves. However, their high conductivity and single dielectric loss mechanism lead to poor impedance matching, and limit their performance in absorbing microwaves. In this paper, a gradient layered structure using MXene combined with waterborne polyurethane (WPU) was designed, and MXene content or nickel content after the magnetization treatment of MXene were varied to create gradient changes in the electromagnetic parameters. It was shown that designing gradient layered structures with different characteristic impedances can allow more electromagnetic waves to enter the substrate and undergo multiple reflections and dissipation at the inner layer and interface. Through optimal structural design, the multi-layer sample (NM<sub>11</sub>-10)<sub>1</sub>(NM<sub>11</sub>-25)<sub>2</sub> achieved an effective absorption bandwidth of 6.80 GHz at a thickness of 4.0 mm, which is 66 % higher than the absorption bandwidth of the corresponding single-layer sample NM<sub>11</sub>-10 (4.10 GHz). This method provides a preparation process for flexible, lightweight, and broadband absorbing materials, showing significant promise for the application of MXene composite materials in the field of wave absorption.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"144 ","pages":"Article 108729"},"PeriodicalIF":5.0,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study of electrostatic ignition of nylon 1010 material under high pressure and pure oxygen environment

IF 5 2区材料科学

Polymer Testing Pub Date : 2025-02-09 DOI: 10.1016/j.polymertesting.2025.108734

Wei Yan , Shanliang Qiu , Xiaoliang Si , Minglei Qu , Zhibao Li , Bo Zhang , Zemin Duan

{"title":"Experimental study of electrostatic ignition of nylon 1010 material under high pressure and pure oxygen environment","authors":"Wei Yan , Shanliang Qiu , Xiaoliang Si , Minglei Qu , Zhibao Li , Bo Zhang , Zemin Duan","doi":"10.1016/j.polymertesting.2025.108734","DOIUrl":"10.1016/j.polymertesting.2025.108734","url":null,"abstract":"<div><div>Polymer materials are prevalently used in the fabrication of oxygen equipment valves; however, they pose significant risks of ignition and explosion, often triggered by electrostatic charges. This study introduces a high-pressure electrostatic ignition test system designed to examine the electrostatic ignition behaviour of nylon 1010 in a pure-oxygen atmosphere across pressures ranging from 0.1 to 3 MPa. Experimental analyses revealed a pronounced initial flame phase during the ignition of nylon 1010, with its duration influenced by spark energy and oxygen pressure. The introduction of nylon 1010 into the electrode gap altered the channel morphology of the spark discharge, leading to shortened discharge durations and diminished energy-release efficiency in the circuit. Moreover, the investigation confirmed that increasing oxygen pressures substantially enhance the flammability of nylon 1010, showing an inverse relationship between the minimum ignition energy and the oxygen pressure. At an oxygen pressure of 1 MPa, the minimum ignition energy reduced to 149.21 mJ, significantly lower than the 1544.34 mJ required at 0.1 MPa. This study contributes valuable insights into the selection and electrostatic safety assessment of polymer materials in oxygen-intensive applications.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"144 ","pages":"Article 108734"},"PeriodicalIF":5.0,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Long-term oxygen plasma etching of UDMA:TEGDMA methacrylate resin: Etching rate and physical property changes UDMA:TEGDMA 甲基丙烯酸酯树脂的长期氧等离子蚀刻：蚀刻速率和物理性质变化

IF 5 2区材料科学

Polymer Testing Pub Date : 2025-02-08 DOI: 10.1016/j.polymertesting.2025.108732

Alexandra Borók , Melinda Szalóki , Dávid Gál , Miklós Veres , Attila Bonyár

{"title":"Long-term oxygen plasma etching of UDMA:TEGDMA methacrylate resin: Etching rate and physical property changes","authors":"Alexandra Borók , Melinda Szalóki , Dávid Gál , Miklós Veres , Attila Bonyár","doi":"10.1016/j.polymertesting.2025.108732","DOIUrl":"10.1016/j.polymertesting.2025.108732","url":null,"abstract":"<div><div>The effect of low-pressure oxygen plasma etching on the physical properties of a dental photopolymer, namely UDMA:TEGDMA in 3:1 wt ratio, was investigated. Samples of the photopolymer were exposed to oxygen plasma from 10 to 120 min time intervals at different power (60, 100 and 140 W) and pressure (0.2, 0.4, and 0.6 mbar) conditions. The etching rate and changes in the surface roughness of the sample were measured with white light interferometry, while the optical properties and chemical changes were monitored by optical and Raman spectroscopy, respectively. It was found that by controlling the power and pressure parameters, steady etching rates can be set up in the 0.11–0.48 μm/min range. Longer etching times (e.g. above 1 h) were found to increase the surface roughness of the polymer significantly, while reducing its optical transparency. This loss in transparency was successfully restored by depositing a second polymer layer on top of the plasma-etched one. Raman spectroscopy investigations revealed that the degree of conversion, the amount of aromatic molecules and the introduced stress are all depend on the applied etching pressure and power conditions. Actinometry with Ar was performed to measure the internal plasma parameters, and the measured etching rates and observed physical-chemical property changes were correlated with the electron temperature and atomic O densities.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"144 ","pages":"Article 108732"},"PeriodicalIF":5.0,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of degradable thermosets and laminated films with cellulose nanofibers: From new bio-based monomer composed of geraniol and 2,5-furandicarboxylic acid

IF 5 2区材料科学

Polymer Testing Pub Date : 2025-02-06 DOI: 10.1016/j.polymertesting.2025.108733

Seonghyun Chung , Sung Bae Park , Cheol Hun Park , Giyoung Shin , Jin Young Seo , Hyo Jeong Kim , Hyeonyeol Jeon , Dongyeop X. Oh , Dong Soo Hwang , Jeyoung Park

{"title":"Development of degradable thermosets and laminated films with cellulose nanofibers: From new bio-based monomer composed of geraniol and 2,5-furandicarboxylic acid","authors":"Seonghyun Chung , Sung Bae Park , Cheol Hun Park , Giyoung Shin , Jin Young Seo , Hyo Jeong Kim , Hyeonyeol Jeon , Dongyeop X. Oh , Dong Soo Hwang , Jeyoung Park","doi":"10.1016/j.polymertesting.2025.108733","DOIUrl":"10.1016/j.polymertesting.2025.108733","url":null,"abstract":"<div><div>The development of biomass-based and recyclable thermosets has been an elusive technological priority in the development of sustainable plastics. Here, we introduce the synthesis of a new, fully bio-based alkene monomer (GFG). The monomer, derived from geraniol and 2,5-furandicarboxylic acid (FDCA) via esterification, was used to develop degradable thermosets through thiol-ene click reactions. The resulting thiol-ene network incorporating GFG demonstrates significantly improved mechanical and thermal properties compared to those of conventional geraniol-based thiol-ene networks. The Young's modulus of the networks ranged from 47 to 923 MPa, and the ultimate tensile strength was 22–25 MPa, thereby offering tunable mechanical properties that meet the requirements of specific applications. With a glass transition temperature of 30–40 °C, the networks also showed enhanced thermal stability owing to the integration of FDCA and increased crosslinking density. Evaluation of the environmental impact of these GFG-based thermoset networks by subjecting them to alkaline hydrolysis confirmed their degradability and chemical recyclability. Additionally, laminating these thermosets with cellulose nanofiber films resulted in flexible and sustainable composite films that are strongly adhesive and optically transparent. These results indicate that the GFG-based networks offer a promising and biodegradable alternative to flexible substrates, with potential application in flexible electronics, packaging, and other fields that require sustainability.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"144 ","pages":"Article 108733"},"PeriodicalIF":5.0,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fatigue lifetime of rubber composites – State-of-the-art

IF 5 2区材料科学

Polymer Testing Pub Date : 2025-02-01 DOI: 10.1016/j.polymertesting.2025.108713

Karolina Głowacka , Jernej Klemenc , Marko Nagode , Tadeusz Łagoda

{"title":"Fatigue lifetime of rubber composites – State-of-the-art","authors":"Karolina Głowacka , Jernej Klemenc , Marko Nagode , Tadeusz Łagoda","doi":"10.1016/j.polymertesting.2025.108713","DOIUrl":"10.1016/j.polymertesting.2025.108713","url":null,"abstract":"<div><div>This paper reviews the literature regarding the fatigue strength of rubber composites - with particular emphasis on using rubber as a matrix. Various forms and materials of rubber reinforcement in rubber-based composites were analyzed. The use of 'classic' reinforcements, such as glass, carbon, or aramid fibers, was especially considered. It was noted that carbon reinforcement can take place in various forms - not only in the form of fibers but also, for example, carbon black. Literature data on rubber reinforcement with plastics, silica, or metal elements, e.g., for the production of tires, were analyzed. What is essential from the point of view of ecological aspects is the possibility of strengthening rubber, being a natural material, with natural additives derived from plants. It was observed that in rubber composites, the reinforcement occurs not only in the form of short or granular fibers but also in the form of continuous fibers – especially in the form of cords. The paper focuses on the analysis of the fatigue properties of these composites, identifying the location of the crack and its path, the course of the hysteresis loop, the dependence between and strain under cyclic loading of these materials, and also the computational models used in the fatigue analysis of rubber-based composites.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"143 ","pages":"Article 108713"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The reinforcement of deep eutectic solvents/silica/natural rubber wet acid-free masterbatch on devil's triangle performance of green tires

IF 5 2区材料科学

Polymer Testing Pub Date : 2025-02-01 DOI: 10.1016/j.polymertesting.2025.108700

Chuansheng Wang , Zheng Gong , Yaqi Ge , Huiguang Bian , Yao Xiao

{"title":"The reinforcement of deep eutectic solvents/silica/natural rubber wet acid-free masterbatch on devil's triangle performance of green tires","authors":"Chuansheng Wang , Zheng Gong , Yaqi Ge , Huiguang Bian , Yao Xiao","doi":"10.1016/j.polymertesting.2025.108700","DOIUrl":"10.1016/j.polymertesting.2025.108700","url":null,"abstract":"<div><div>To solve the problems of poor dispersion of silica in natural rubber, and the mutual constraints between abrasion resistance, rolling resistance and wet skid resistance of green tires, two new green deep eutectic solvents (DES) and the DES-silica/NR wet masterbatch were prepared through acid-free flash drying technology, the effects of DES types and wet mixing technology on Payne effect, mechanical properties and devil's triangle performance prepared from NR/silica basic formula and SSBR/NR/silica semi-steel green tire formula were investigated. FTIR proved that DES improved the dispersion of silica in NR and increased the filler-rubber network structure. In the NR/silica basic formula, the Payne effect decreased, the silanization reaction index and the aging resistance improved after DES replaced Si69, meanwhile, DES1 had higher processing safety and comprehensive performance than DES2. In the SSBR/NR/silica semi-steel green tire formula, compared with dry mixing, DES-silica/NR masterbatch group's Payne effect is reduced by 82 %, compression fatigue temperature rise is reduced by 17.5 °C, abrasion resistance and tensile product coefficient are improved by 21 % and 28 %, respectively, while having lower rolling resistance and higher wet skid resistance, widening the devil's triangle performance of green tires.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"143 ","pages":"Article 108700"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of alkali treatment on the bending and fracture behavior of biomaterial bamboo

IF 5 2区材料科学

Polymer Testing Pub Date : 2025-02-01 DOI: 10.1016/j.polymertesting.2025.108715

Xiaohan Chen , Xianke Wang , Shaohua Gu , Aiyue Huang , Haitao Cheng

{"title":"Effects of alkali treatment on the bending and fracture behavior of biomaterial bamboo","authors":"Xiaohan Chen , Xianke Wang , Shaohua Gu , Aiyue Huang , Haitao Cheng","doi":"10.1016/j.polymertesting.2025.108715","DOIUrl":"10.1016/j.polymertesting.2025.108715","url":null,"abstract":"<div><div>Although bamboo has broad application prospects in the transportation industry, its insufficient flexibility remains a challenge when designing components with large curvature and complex shapes. In this study, SEM, XRD, FTIR, and micron-level computed tomography (Micro-CT) were used to investigate the effects of alkali treatment with different mass concentrations and different loading directions on the flexibility expression of bamboo, and to evaluate the potential relationship between the structure and flexibility of bamboo. The results showed that in the bamboo samples treated with 15 wt% NaOH, fiber fibrillation and surface thin layer peeling during the fracture process increased the consumption of fracture energy, thereby improving the theoretical tensile strength and bending fracture toughness. Microstructurally, after alkali treatment, the loosening between cells increases the compressible space, leading to a significant prolongation of the plastic stage, especially when loaded from the radial bamboo yellow side (Mode II). When the NaOH concentration reached 25 wt%, the excessive removal of hemicellulose and lignin led to the destruction of the cell wall structure and a decrease in the fiber crystallinity, and the mechanical properties of bamboo were reduced. Therefore, appropriate alkali treatment can maintain the strength of bamboo and improve its flexibility, which is similar to the principle of mercerized cotton. The modified bamboo has application potential in curved components in the transportation field and can meet the requirements of lightweight, flexibility, and environmental protection.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"143 ","pages":"Article 108715"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0