Polymer Testing最新文献_第8页

Mechanical, thermal, and antimicrobial behavior of copper-enhanced polypropylene composites with improved UV stability 提高紫外线稳定性的铜增强聚丙烯复合材料的机械、热学和抗菌性能

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2025-12-01 Epub Date: 2025-11-06 DOI: 10.1016/j.polymertesting.2025.109036

Mohammed Baafif , Hany S. Abdo , Abdulmohsen Albedah

This study investigates the incorporation of copper nanoparticles (Cu NPs) into polypropylene (PP) matrices to enhance mechanical, thermal, and antimicrobial properties, addressing the growing challenge of antimicrobial resistance (AMR). Cu NP–PP composites were fabricated using twin-screw extrusion and injection molding, with nanoparticle concentrations of 0 %, 1 %, 2 %, 5 %, and 10 %. Mechanical testing revealed that lower Cu NP loadings (1 %–5 %) improved yield strength (by 2 %–5 %) and elastic modulus (by 1.2 %–1.9 %), while higher concentrations (≥5 %) led to performance reductions due to stress concentration effects. Thermal analysis demonstrated increased stability, with TGA onset and peak degradation temperatures rising from 445 °C and 469 °C (pure PP) to 455- °C - 462 °C and 475 °C -481 °C, respectively, in Cu NP–reinforced composites. DSC results showed higher crystallinity retention in Cu NP–PP composites (40.8 %–50.2 %) compared to pure PP (41.7 %). Furthermore, Cu NPs imparted significant antimicrobial efficacy, particularly against Gram-negative bacteria such as Pseudomonas aeruginosa. In addition, a minor improvement in UV stability was observed, suggesting secondary protection of the polymer matrix against photodegradation. These findings highlight the multifunctional potential of Cu NP–PP composites for healthcare and outdoor applications, offering a promising approach to mitigating AMR-related risks while enhancing durability.

本研究探讨了将铜纳米颗粒（Cu NPs）掺入聚丙烯（PP）基质中，以增强其机械、热学和抗菌性能，解决日益严峻的抗菌素耐药性（AMR）挑战。采用双螺杆挤压和注射成型法制备了纳米颗粒浓度分别为0%、1%、2%、5%和10%的铜NP-PP复合材料。力学测试表明，较低的Cu NP负荷（1% - 5%）提高了屈服强度（2% - 5%）和弹性模量（1.2% - 1.9%），而较高的Cu NP负荷（≥5%）由于应力集中效应导致性能降低。热分析表明，Cu - np增强复合材料的稳定性有所提高，TGA起始温度和峰值降解温度分别从445°C和469°C（纯PP）上升到455°C - 462°C和475°C -481°C。DSC结果表明，与纯PP（41.7%）相比，Cu NP-PP复合材料的结晶度保留率（40.8% - 50.2%）更高。此外，铜NPs具有显著的抗菌功效，特别是对革兰氏阴性细菌，如铜绿假单胞菌。此外，观察到紫外线稳定性略有改善，表明聚合物基质对光降解具有二次保护作用。这些发现突出了Cu NP-PP复合材料在医疗保健和户外应用中的多功能潜力，提供了一种有希望的方法来减轻amr相关风险，同时提高耐用性。

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引用次数: 0

On the assessment of strength and durability of weld lines in injection-moulded unreinforced and short glass fiber reinforced polypropylene 非增强和短玻纤增强聚丙烯注射成型焊缝强度和耐久性评价

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2025-12-01 Epub Date: 2025-11-07 DOI: 10.1016/j.polymertesting.2025.109035

Aitor Arriaga , Sten J.J. van den Broek , Leon E. Govaert , Tom A.P. Engels

Identifying and predicting the performance of process-induced defects, such as weld lines in injection-moulded thermoplastic components, is critical for failure assessment. While previous studies have addressed various weld line phenomena, accurately predicting their instantaneous and long-term strength remains a challenge. This study investigates the thermo-mechanical performance of unreinforced, and 30 % glass fiber-reinforced isotactic polypropylene (iPP) processed by injection moulding into specimens containing a central weld line due to a stagnating flow. Short-term experiments on smooth tensile bars at various strain rates (from 10⁻⁶ to 10⁻² s⁻¹) and temperatures (−20 °C, 23 °C and 80 °C) identify plasticity driven failure kinetics with a transition towards brittle crack-growth driven failure at high temperatures and low strain rates. Long-term plasticity driven performance is assessed through creep-to-rupture and cyclic fatigue tests on tensile bars and identify the same transition from ductile-to-brittle failure, as well as a clear discrepancy in perceived plasticity-governed strength when comparing short- and long-term experiments. The key novelty of the work is found in the demonstration that stress rate-controlled tensile experiments rationalise this observed discrepancy in strength that is explained by strain localisation. We therefore propose the stress rate-controlled tensile test to be more suitable to assess the strength of a weld line compared to the traditional strain-rate controlled tensile test. All observations are accurately captured using Ree-Eyring flow theory. The crack-growth governed failure of the weld line is explored by including fatigue crack growth experiments on CT specimens on both unreinforced and reinforced materials and general findings are presented.

识别和预测工艺缺陷的性能，如注射成型热塑性部件的焊缝，是失效评估的关键。虽然以前的研究已经解决了各种焊缝现象，但准确预测其瞬时和长期强度仍然是一个挑战。本研究研究了未增强和30%玻璃纤维增强等规聚丙烯（iPP）的热机械性能，通过注射成型加工成含有中心焊缝的样品，因为流动停滞。在不同应变速率（从10−6到10−2 s−1）和温度（- 20°C， 23°C和80°C）下对光滑拉伸棒进行的短期实验确定了塑性驱动的破坏动力学，并在高温和低应变速率下向脆性裂纹扩展驱动的破坏过渡。通过拉伸杆的蠕变到断裂和循环疲劳试验来评估长期塑性驱动性能，并确定了从延性到脆性破坏的相同转变，以及在比较短期和长期实验时感知到的塑性控制强度的明显差异。这项工作的关键新颖之处在于，应力速率控制的拉伸实验使这种观察到的强度差异合理化，这种差异是由应变局部化解释的。因此，与传统的应变速率控制拉伸试验相比，我们提出应力速率控制拉伸试验更适合于评估焊缝的强度。所有的观测结果都是使用李-艾灵流理论准确捕获的。通过对未增强材料和增强材料的CT试样进行疲劳裂纹扩展试验，探讨了裂纹扩展对焊缝破坏的影响，并给出了一般结果。

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引用次数: 0

PAM-co-VI-based bimetallic-doped single-network conductive hydrogel for stress sensing and ECG signal monitoring applications 基于pam -co- vi的双金属掺杂单网导电水凝胶用于应力传感和心电信号监测

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2025-12-01 Epub Date: 2025-10-31 DOI: 10.1016/j.polymertesting.2025.109025

Yingying Zhang , Cancan Yang , Chongyue Bai , Xuanye Wang , Chao Feng , Huige Wei

Polyacrylamide (PAM) based hydrogels are promising for soft strain sensor applications, while the incorporation of vinylimidazole (VI) endows the hydrogels with unique ion responsiveness and good biocompatibility. In this study, a high-performance PAM-co-VI/Ni/Co hydrogel was successfully fabricated through copolymerization of PAM with VI followed by modification with bimetallic nickel-cobalt ions. Experimental results demonstrate that when the VI content is 30 % with a Ni/Co ion ratio of 3:1, the hydrogel exhibits remarkable comprehensive properties, with a tensile fracture strength of 0.46 MPa, an ultrahigh fracture strain of 1800 %, a tensile sensitivity of 4.62, and long-term durability exceeding 1000 cycles. Furthermore, the hydrogel shows high pressure sensitivity (0.059 kPa⁻¹ in the 0–5 kPa range), enabling precise detection of various mechanical signals from acoustic vibrations to complex human motions. Owing to its superior conductivity and biocompatibility, the PAM-co-VI/Ni/Co hydrogel also functions as a flexible electrode for electrocardiogram (ECG) monitoring, achieving conformal skin contact while stably acquiring high signal-to-noise ratio ECG waveforms with accurate identification of P-waves, Q, R, and S waves (QRS complexes), and other key features, demonstrating great potential for wearable health monitoring applications.

聚丙烯酰胺（PAM）为基础的水凝胶在软应变传感器领域具有广阔的应用前景，而乙烯酰咪唑（VI）的掺入使水凝胶具有独特的离子响应性和良好的生物相容性。在本研究中，通过PAM与VI的共聚，再用双金属镍钴离子改性，成功制备了高性能PAM- Co -VI/Ni/Co水凝胶。实验结果表明，当VI含量为30%，Ni/Co离子比为3:1时，水凝胶具有优异的综合性能，拉伸断裂强度为0.46 MPa，超高断裂应变为1800%，拉伸灵敏度为4.62，长期耐久性超过1000次。此外，水凝胶具有很高的压力敏感性（在0-5 kPa范围内为0.059 kPa−1），能够精确检测从声音振动到复杂人体运动的各种机械信号。PAM-co-VI/Ni/Co水凝胶由于其优异的导电性和生物相容性，还可作为心电图监测的柔性电极，在实现适形皮肤接触的同时，稳定地获得高信噪比的心电波形，准确识别p波、Q波、R波和S波（QRS复合物），以及其他关键特性，显示出可穿戴健康监测应用的巨大潜力。

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引用次数: 0

Flexible PVDF/ZnO/rGO and PVDF/ZnO/CNT electrodes designed for piezoelectric nanogenerators 用于压电纳米发电机的柔性PVDF/ZnO/rGO和PVDF/ZnO/CNT电极

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2025-12-01 Epub Date: 2025-11-03 DOI: 10.1016/j.polymertesting.2025.109023

Zohreh Moarref , Majid Montazer , Roohollah Bagherzadeh (.) , Nahid Hemmatinejad , Sara Ziaee

The newly interesting topics about wearable electronics and smart textiles usually require a pair of flexible conductive electrodes. As far as conductivity is concerned, carbon nanomaterials are of particular interest. This study aimed to design flexible piezoelectric nanogenerators (PENGs) with carbon-based electrodes. Here, two different types of electrodes were fabricated using composites of polyvinylidene fluoride (PVDF) with single-walled carbon nanotubes (CNT) in one and reduced graphene oxide (rGO) in the other. The PENGs were structured by placing a piezo-active nanofibrous mat of PVDF and ZnO nanopowder between each pair of electrodes. The optimal PENGs were then integrated using polydimethylsiloxane (PDMS). The piezoelectric voltage constant (g₃₃) of rGO-contained samples was approximately 5 times higher than that of samples with CNT. However, the opposite results were obtained in their tensile stress by a declining factor of 1.35. The piezoelectric sensitivity was enhanced by 5–9 % after integration. Finally, these flexible PENGs can be promising candidates for harvesting energy through textiles.

关于可穿戴电子产品和智能纺织品的新话题通常需要一对柔性导电电极。就导电性而言，碳纳米材料尤其令人感兴趣。本研究旨在设计具有碳基电极的柔性压电纳米发电机（peng）。在这里，两种不同类型的电极是用聚偏氟乙烯（PVDF）复合材料制成的，其中一种是单壁碳纳米管（CNT），另一种是还原氧化石墨烯（rGO）。通过在每对电极之间放置PVDF和ZnO纳米粉末的压电活性纳米纤维垫来构建peng。然后用聚二甲基硅氧烷（PDMS）对优化后的聚合物进行整合。含碳纳米管样品的压电电压常数（g33）约为含碳纳米管样品的5倍。然而，其拉应力以1.35的下降系数得到相反的结果。集成后的压电灵敏度提高了5 - 9%。最后，这些灵活的peng可以成为通过纺织品收集能量的有希望的候选者。

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引用次数: 0

Formation of skin-core structure in filled room-temperature vulcanized polydimethylsiloxane after long exposure to moderate temperatures 室温硫化聚二甲基硅氧烷经长时间中等温度作用后填充的皮核结构的形成

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2025-12-01 Epub Date: 2025-10-28 DOI: 10.1016/j.polymertesting.2025.109022

Florian Feyne , Eric Le Bourhis , Florian Lacroix , Laurence Autissier , Julie Pepin , Olga Smerdova

This study highlights the formation of a skin-core effect inside a filled silicone rubber exposed to air for durations up to 600 days at temperatures between 30 °C and 70 °C. Coupling mechanical and physico-chemical characterisations reveal that the volatile components, such as crosslinking by-products and oligomers, evaporate from the elastomeric network during the exposure, resulting in the shrinkage of the sample. This phenomenon gives rise to the formation of a composition gradient from the sample's surface towards its core. All the samples become more brittle with ageing, but the tensile modulus increase only slightly at the longest durations and highest temperatures. More fillers are found on the outer surface while the infrared spectra in the core of the sample remain unaffected by neither the temperature nor the duration. The nanoindentation highlights gradients of elastic modulus on the cross-section and provides an estimation of the skin thickness. By wrapping the samples in aluminum foil, the evaporation of volatile components is prevented. The measured properties remain constant with the duration of thermal exposure even at the highest temperature.

这项研究强调了在30°C到70°C的温度下，在空气中暴露长达600天的填充硅橡胶内形成皮肤核心效应。耦合力学和物理化学特征表明，挥发性成分，如交联副产物和低聚物，在暴露过程中从弹性体网络中蒸发，导致样品收缩。这种现象导致了从样品表面到其核心的组成梯度的形成。随着时效的增加，所有样品都变得更脆，但拉伸模量在最长持续时间和最高温度下仅略有增加。外表面存在较多的填料，而样品芯部的红外光谱不受温度和持续时间的影响。纳米压痕突出了截面上弹性模量的梯度，并提供了对皮肤厚度的估计。用铝箔包裹样品，可防止挥发性成分的蒸发。即使在最高温度下，所测得的性能也随热暴露时间的延长而保持不变。

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引用次数: 0

Water vapor diffusion in cracked HDPE sheaths of bridge cables under ultraviolet radiation, coupled environmental temperature-humidity and alternating strain 紫外线辐射、环境温湿度和交变应变耦合作用下桥梁电缆HDPE裂纹护套中的水蒸气扩散

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2025-12-01 Epub Date: 2025-11-04 DOI: 10.1016/j.polymertesting.2025.109030

Qingling Meng , Haochen Duan , Sen Lu , Yuzhu Wen , Peipeng Wang , Hailiang Wang , Huayong Wu , Xiaoyu Guo , Yang Qian , Minzhuo Liang , Xin Liu

The diffusion mechanism of water vapor in cracked high-density polyethylene (HDPE) sheaths of cable-stayed bridges under alternating strain remains unclear, limiting durability assessments. Here we investigate vapor diffusion in cracked HDPE sheaths under coupled temperature–humidity and alternating strain using a custom gravimetric penetration device; cracks were introduced via alternating UV–fatigue pretreatment. Experiments show that UV degradation reduces mechanical integrity and increases microchannel density, enhancing vapor ingress; the diffusion flux J scales linearly with the inside–outside RH difference ΔRH, while the diffusion coefficient D exhibits an Arrhenius temperature dependence. Alternating strain widens crack micro-pores and raises D by 6–10 % via an influence factor f(ε). Integrating Fick's law with measurements, we formulate a diffusion-coefficient model D (T, ΔRH, ε, A) that incorporates temperature–humidity coupling, strain effects, and equivalent crack area; multivariate analysis ranks governing factors as temperature > strain magnitude > crack area > strain period > RH difference. The model predicts time-to-critical humidity from environmental conditions and A, directly informing sheath sealing/coating and maintenance decisions and bridging key gaps in environmental–load coupled degradation of cable sheaths.

在交变应变作用下，水蒸气在开裂的高密度聚乙烯（HDPE）斜拉桥护套中的扩散机制尚不清楚，这限制了耐久性评估。本文采用自定义的重力穿透装置，研究了温度-湿度耦合和交变应变作用下HDPE裂纹鞘层中的蒸汽扩散；通过交变紫外疲劳预处理引入裂纹。实验表明，紫外降解降低了机械完整性，增加了微通道密度，增加了水蒸气的进入；扩散通量J与内外RH差成线性关系ΔRH，扩散系数D与阿累尼乌斯温度相关。交变应变通过影响因子f（ε）使裂纹微孔变宽，使D增大6 ~ 10%。将菲克定律与测量相结合，我们建立了一个包含温度-湿度耦合、应变效应和等效裂纹面积的扩散系数模型D (T， ΔRH, ε, a)；多变量分析将影响因素分为温度>、应变大小>、裂纹面积>、应变周期>、相对湿度差。该模型根据环境条件和A预测达到临界湿度的时间，直接为护套密封/涂层和维护决策提供信息，并弥补环境载荷耦合电缆护套退化的关键空白。

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引用次数: 0

Design of high-performance phase change composites using erythritol-modified epoxy/docosane and cellulose-grafted spherical aluminum nitride 赤四醇改性环氧树脂/十二烷和纤维素接枝球形氮化铝高性能相变复合材料的设计

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2025-12-01 Epub Date: 2025-11-15 DOI: 10.1016/j.polymertesting.2025.109049

Wondu Lee , Min Park , Pei-Chen Su , Jooheon Kim

The increasing demand for efficient thermal regulation in high-power electronic devices necessitates the development of advanced thermal interface materials. In this work, a novel composite was fabricated to address this challenge. The foundational material, an epoxy–erythritol (EPET) matrix, was synthesized by chemically grafting a phase-change material (PCM) onto an epoxy base, resulting in a single endothermic transition within the range of 110–124 °C. To broaden the thermal response, docosane was introduced, producing an EPET/docosane hybrid system that exhibited multiple endothermic transitions in the ranges of 40–60 °C and 110–124 °C. To enhance heat transfer performance, spherical aluminum nitride (AlN) was incorporated as a thermally conductive filler. The AlN particles were surface-modified with cellulose nanofiber (CNF) to improve interfacial adhesion with the polymer matrix and promote efficient thermal transport. The optimized composite, EPET/Docosane/AlN-CNF, achieved a thermal conductivity of 6.31 W/m·K and a total latent heat of 130.7 J/g. When applied to a CPU, the composite demonstrated superior heat-buffering capability, attributed to its dual endothermic transitions and high latent heat. These findings validate the potential of the developed composite as a high-performance thermal interface material for next-generation electronic devices.

大功率电子器件对高效热调节的需求日益增长，要求开发先进的热界面材料。在这项工作中，制造了一种新型复合材料来解决这一挑战。基础材料是环氧赤四醇（EPET）基质，通过化学接枝相变材料（PCM）到环氧基上，在110-124℃范围内实现了单次吸热转变。为了扩大热响应范围，我们引入了docosane，生产了EPET/docosane混合体系，该体系在40-60°C和110-124°C范围内表现出多次吸热转变。为了提高传热性能，采用球形氮化铝（AlN）作为导热填料。用纤维素纳米纤维（CNF）对AlN颗粒进行表面改性，以改善其与聚合物基体的界面粘附性，促进高效的热传递。优化后的复合材料EPET/Docosane/AlN-CNF的导热系数为6.31 W/m·K，总潜热为130.7 J/g。当应用于CPU时，由于其双吸热转变和高潜热，该复合材料表现出优越的热缓冲能力。这些发现验证了开发的复合材料作为下一代电子设备的高性能热界面材料的潜力。

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引用次数: 0

Optimization of amine-based hydrogel sorbents for CO2 capture: The role of crosslinkers 胺基水凝胶吸附CO2的优化：交联剂的作用

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2025-12-01 Epub Date: 2025-11-03 DOI: 10.1016/j.polymertesting.2025.109017

Yiwei Long , Jieke Jiang , Wilko Rohlfs , Wim Brilman , Claas Willem Visser

Amine-based hydrogel sorbents are gaining increasing attention for CO₂ capture application due to their long-term stability, simple fabrication, and compatibility with humid environments. These hydrogels are solidified with crosslinkers, which have a potentially large but unstudied influence on both the production process and the CO₂ uptake of the sorbent. Therefore, in this study, we systematically investigate how different crosslinkers influence the performance of polyethylenimine (PEI)-based hydrogel sorbents. Six crosslinkers representing acids, epoxides, and vinyl-based agents are initially screened based on crosslinking time, toxicity, and material cost. Subsequently, epichlorohydrin (ECH)-, trimethylolpropane triglycidyl ether (TTE)-, and 3-glycidyloxypropyltrimethoxysilane (GPTMS)-crosslinked particles are selected for detailed investigation on their CO₂ uptake and mechanical strength. Among the three, TTE-crosslinked particles show the highest CO₂ uptake, closely followed by GPTMS, with ECH significantly lower. All three crosslinkers result in sorbents with excellent cycling stability when using steam regeneration. GPTMS particles offer higher CO₂ uptake under low-humidity conditions and exhibit the best mechanical strength, which makes GPTMS as superior for the selected crosslinkers. Overall, the presented evaluation method provides practical guidelines for design and evaluation of durable, high-performance hydrogel sorbents for CO₂ capture.

胺基水凝胶吸附剂由于其长期稳定性、制造简单和与潮湿环境的兼容性，在二氧化碳捕集应用中越来越受到关注。这些水凝胶是用交联剂固化的，这对生产过程和吸附剂的二氧化碳吸收都有潜在的巨大影响，但尚未研究。因此，在本研究中，我们系统地研究了不同交联剂对聚乙烯亚胺（PEI）基水凝胶吸附剂性能的影响。六种交联剂代表酸，环氧化物和乙烯基剂最初筛选基于交联时间，毒性和材料成本。随后，选择环氧氯丙烷(ECH)-、三甲基丙烷三缩水甘油酯醚(TTE)-和3-缩水甘油酯氧基丙基三甲氧基硅烷(GPTMS)-交联颗粒，对其CO2吸收率和机械强度进行了详细的研究。其中，te交联颗粒的CO2吸收量最大，其次是GPTMS，其CO2吸收量显著低于GPTMS。当使用蒸汽再生时，所有三种交联剂都会产生具有优异循环稳定性的吸附剂。GPTMS颗粒在低湿度条件下具有更高的CO2吸收量，并表现出最佳的机械强度，这使得GPTMS成为所选交联剂的优势。总的来说，提出的评估方法为设计和评估耐用、高性能的水凝胶吸收剂提供了实用的指导方针。

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引用次数: 0

Strain-induced crystallization and elastocaloric response in SLS-printed thermoplastic polyurethane sls印刷热塑性聚氨酯的应变诱导结晶和弹热响应

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2025-12-01 Epub Date: 2025-10-24 DOI: 10.1016/j.polymertesting.2025.109014

A. Vaz-Romero , A. Montoya , J.P. Fernández-Blázquez , S.C. Cifuentes

In this work, we investigate the elastocaloric performance (eCE) of thermoplastic polyurethane (TPU) processed via Selective Laser Sintering (SLS), an additive manufacturing technique with significant yet underexplored potential in this field. A comprehensive experimental methodology was developed, which combines mechanical testing of V-notched specimens, infrared thermography, and in situ SAXS/WAXS analysis to simultaneously track mechanical, thermal, and structural evolution under cyclic loading. The experimental results reveal reversible adiabatic temperature changes of up to 5 °

C

, associated with strain-induced crystallization (SIC) and directional structural orientation. The use of a localized notched geometry (V-notched) enhanced the elastocaloric response at moderate global strains. Numerical modeling further confirmed the development of stress states favorable for SIC. These findings validate the elastocaloric functionality of SLS-printed TPU and offer new insights into processing–structure–property relationships. This work represents a step forward in the development of scalable, environmentally friendly cooling devices based on polymeric materials.

在这项工作中，我们研究了通过选择性激光烧结（SLS）加工的热塑性聚氨酯（TPU）的弹热性能（eCE），这是一种在该领域具有重要但尚未开发潜力的增材制造技术。开发了一种综合实验方法，将v形缺口试件的力学测试、红外热成像和原位SAXS/WAXS分析相结合，同时跟踪循环加载下的力学、热学和结构演变。实验结果表明，在应变诱导结晶（SIC）和定向结构取向的影响下，温度可发生高达5℃的可逆绝热变化。局部缺口几何形状（v形缺口）的使用增强了在中等全局应变下的弹热响应。数值模拟进一步证实了有利于SIC的应力状态的发展。这些发现验证了sls打印TPU的弹性功能，并为加工-结构-性能关系提供了新的见解。这项工作代表了基于聚合物材料的可扩展、环保冷却装置的发展向前迈出了一步。

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引用次数: 0

Interplay of surface energy and rheology in biopolymer soil enhancement 表面能与流变性在生物聚合物土壤强化中的相互作用

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2025-12-01 Epub Date: 2025-10-25 DOI: 10.1016/j.polymertesting.2025.109018

Yiwei Fang , Jinxuan Ding , Wanchuan Liu , Damien Crowley , Justin Antonette , Haoyan Fang , Aniket Raut , David Sprouster , Xiaoyang Liu , Yu-Chung Lin , Dilip Gersappe , Miriam Rafailovich

Biopolymers such as xanthan gum (XG) and locust bean gum (LBG) hold great potential as eco-friendly alternative soil binders. In this work, we investigated the impact of XG/LBG mixtures on the unconfined compressive strength (UCS) of sand. The high strength of dry biopolymer/sand arises from the cohesion between solid polymer films and sand particles which supported by work of adhesion calculation and soil mechanics measurement. LBG exhibits much lower sand reinforcement efficacy because polymers unevenly distributed within sand matrix. The formation of a core-shell structure in LBG/sand is an interplay of surface free energy and viscoelastic properties of polymer solutions. This structure is altered when LBG mixed with XG at varying ratios as those physical properties changed due to the complexity of polymer chains association. By probing these factors, we aim to elucidate the role of surface energies and polymer physics in governing the strength of the sand/polymer network, thereby contributing to a more comprehensive understanding polymer-sand interface. The low strength of gels (G’ ∼10Pa) cannot solely account for the increased UCS of wet sand over 10 kPa. Instead, the high strength of biopolymer/sand is more likely derived from the granular particles with biopolymers as solid glue.

黄原胶（XG）和刺槐豆胶（LBG）等生物聚合物作为生态友好的土壤粘合剂具有巨大的潜力。在这项工作中，我们研究了XG/LBG混合物对砂的无侧限抗压强度（UCS）的影响。干性生物聚合物/砂的高强度是由固体聚合物膜与砂粒之间的内聚作用决定的，黏附力计算和土力学测量结果支持了这一结论。由于聚合物在砂基质中的分布不均匀，LBG的加固效果较差。LBG/砂中核壳结构的形成是聚合物溶液的表面自由能和粘弹性相互作用的结果。当LBG以不同的比例与XG混合时，这种结构会发生变化，因为聚合物链结合的复杂性改变了这些物理性质。通过探索这些因素，我们的目标是阐明表面能和聚合物物理在控制砂/聚合物网络强度方面的作用，从而有助于更全面地了解聚合物-砂界面。凝胶的低强度（G′~ 10Pa）不能完全解释湿砂在10 kPa以上的单轴抗压强度增加的原因。相反，生物聚合物/砂的高强度更可能来自于与生物聚合物作为固体胶的颗粒颗粒。

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引用次数: 0