International Journal of Polymer Analysis and Characterization最新文献

Fast and energy efficient crosslinking of PVA to make water resistant coating using glutaraldehyde 戊二醛用于聚乙烯醇快速高效交联制备防水涂料

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2025-10-03 DOI: 10.1080/1023666X.2025.2504562

Shyambabu K. Sainik , Prasanta K. Panda , T.V. Sreekumar

Glutaraldehyde has recently drawn attention as a crosslinking agent for PVA due to its ability to facilitate reactions under ambient conditions. The study focused on comparing the effects of glutaraldehyde, formaldehyde, and glyoxal as crosslinking agents for PVA under similar conditions, using different aldehyde-to-PVA ratios (0.2, 0.4, 0.6, 0.8, and 1.0). The crosslinking reaction was conducted at 50 °C for a duration of 5 min, to assess the efficiency of crosslinking agents at milder conditions. Initial evaluations focused on determining the water swelling degree, the degree of crosslinking, and moisture uptake of the prepared films under humid conditions. Results demonstrated a high degree of crosslinking: with glutaraldehyde at GA/PVA ratios of 0.6 and 0.8, crosslinking reached 99%. Formaldehyde achieved a crosslinking degree of 97% at an FA/PVA ratio of 0.8, while glyoxal reached 90% at a ratio of 0.2. Among the aldehydes tested, glutaraldehyde exhibited the highest crosslinking efficiency under similar conditions, making it the preferred crosslinker for further characterization studies. FTIR, TGA, and XRD spectra confirmed successful crosslinking between GA and PVA, evidenced by acetal bond formation and changes in the diffraction patterns correlating with increased amorphous character in the PVA films.

戊二醛作为聚乙烯醇的交联剂，由于其在环境条件下促进反应的能力，最近引起了人们的关注。本研究的重点是比较戊二醛、甲醛和乙二醛作为交联剂在相似条件下，使用不同的醛与PVA的比例（0.2、0.4、0.6、0.8和1.0）对PVA的影响。交联反应在50℃下进行，持续时间为5分钟，以评估交联剂在温和条件下的效率。初步评价的重点是确定在潮湿条件下制备的薄膜的水膨胀度、交联度和吸湿性。结果表明，在GA/PVA比为0.6和0.8时，戊二醛的交联度达到99%。当FA/PVA比为0.8时，甲醛的交联度为97%，当FA/PVA比为0.2时，乙二醛的交联度为90%。在测试的醛类中，戊二醛在相似的条件下表现出最高的交联效率，使其成为进一步表征研究的首选交联剂。FTIR， TGA和XRD光谱证实了GA和PVA之间成功的交联，证明了缩醛键的形成和PVA薄膜中无定形特性增加相关的衍射图的变化。

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引用次数: 0

Enhancing geopolymer concrete strength with sodium hydroxide using Gegenbauer graph neural networks approach 用Gegenbauer图神经网络方法提高氢氧化钠地聚合物混凝土强度

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2025-10-03 DOI: 10.1080/1023666X.2025.2490782

Ramakrishnan S. , Rajeshkannan Sundararajan , V. Ramya , M. Elangovan

An eco-friendly and inventive alternative to cement-based concrete is geopolymer concrete (GPC) due to its reduced carbon footprint, as it completely replaces cement. Despite their environmental benefits, the mechanical performance of GPC is highly sensitive to the mix of proportions and curing conditions, presenting significant challenges in achieving consistent strength. To enhance the strength and mechanical properties of GPC with sodium hydroxide (NaOH), a unique approach using Gegenbauer graph neural networks (GGNN) is presented in this work. The main objectives of this study include reducing CO₂ emissions. The strength of GPC with NaOH is predicted using GGNN. The GGNN method is also used to analyze the mechanical properties of GPC under different NaOH molarities and different ratios of sodium silicate to NaOH. The proposed method is simulated in MATLAB and is compared with existing methods like long short-term memory (LSTM), artificial neural network (ANN), and back propagation neural network (BPNN). It is found that the oven-cured GPC achieved better mechanical strength compared to the ambient-cured GPC. The proposed model attained the highest compressive strength (CS) of 75.42 MPa along with a high correlation coefficient of 0.9871 compared to the previous studies. In contrast to the existing methods, the proposed model achieved a high prediction accuracy of 98.5% along with a low CO₂ emission of 7% demonstrating its superior performance in accurately predicting the mechanical strength and reducing carbon footprints. This indicates the robustness and reliability of the proposed model for optimizing material properties and advancing the field of sustainable construction materials.

地聚合物混凝土（GPC）是水泥基混凝土的环保和创新替代品，因为它可以完全取代水泥，减少碳足迹。尽管具有环境效益，但GPC的机械性能对混合比例和固化条件非常敏感，这对实现一致的强度提出了重大挑战。为了提高氢氧化钠（NaOH） GPC的强度和力学性能，本文提出了一种使用Gegenbauer图神经网络（GGNN）的独特方法。这项研究的主要目标包括减少二氧化碳的排放。用GGNN预测了含NaOH的GPC的强度。采用GGNN方法分析了不同NaOH摩尔浓度和水玻璃与NaOH的不同配比下GPC的力学性能。在MATLAB中对该方法进行了仿真，并与长短期记忆（LSTM）、人工神经网络（ANN）和反向传播神经网络（BPNN）等现有方法进行了比较。结果表明，与常温固化GPC相比，高温固化GPC具有更好的机械强度。与已有研究相比，该模型获得了最高的抗压强度（CS）为75.42 MPa，相关系数为0.9871。与现有方法相比，该模型预测精度高达98.5%，二氧化碳排放量低至7%，在准确预测机械强度和减少碳足迹方面具有优越的性能。这表明所提出的模型对于优化材料性能和推进可持续建筑材料领域具有鲁棒性和可靠性。

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引用次数: 0

A comprehensive study on the mechanical qualities of FDM 3D printed coconut wood-polylactic acid composite FDM 3D打印椰木-聚乳酸复合材料力学性能综合研究

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2025-10-03 DOI: 10.1080/1023666X.2025.2504553

Rajan Kumaresan , Ngui Wai Keng , Mahendran Samykano , Kumaran Kadirgama , Adarsh Kumar Pandey , Avinash M. Badadhe , Ponnambalam S. G

The field of additive manufacturing is experiencing significant growth, transitioning from primarily serving as a prototyping service to becoming a full-fledged manufacturing service. Fused deposition modeling (FDM) printers have emerged as the predominant 3D printer in the current market landscape, driven by a notable surge in sales. Various industries have widely adopted these processes to manufacture limited quantities of intricate and personalized components. However, finding the optimal process parameters is complex due to inherent conflicts between various factors. One significant drawback of existing literature on selecting the most suitable parameters is the inadequate precision in estimating product quality. In this study, the properties of PLA and PLA/coconut wood (CT.W) are investigated and the appropriate parameters for various mechanical properties are determined. The specimens in this study vary in parameters, including infill pattern (grid, octagram spiral, rectilinear, honeycomb, and concentric) and infill percentage (25%, 50%, and 75%). The findings indicate that PLA and PLA/Ct.W specimens with 75% infill density and concentric infill pattern exhibit higher energy absorption in tensile, flexural, and impact properties. When comparing the properties of the PLA composite, it is observed that they are slightly lower due to the larger size of the coconut wood particles.

增材制造领域正经历着显著的增长，从最初的原型设计服务转变为成熟的制造服务。在销售显著激增的推动下，熔融沉积建模（FDM）打印机已成为当前市场格局中占主导地位的3D打印机。各行各业都广泛采用这些工艺来制造数量有限的复杂和个性化部件。然而，由于各种因素之间的内在冲突，寻找最优工艺参数是复杂的。在选择最合适的参数方面，现有文献的一个重大缺点是估计产品质量的精度不足。本文研究了聚乳酸（PLA）和聚乳酸/椰子木（CT.W）的性能，并确定了各种力学性能的合适参数。本研究中试样的参数不同，包括填充模式（网格、八角形螺旋、直线、蜂窝和同心）和填充百分比（25%、50%和75%）。结果表明PLA和PLA/Ct。75%填充密度和同心填充模式的W试样在拉伸、弯曲和冲击性能上具有更高的能量吸收。当比较PLA复合材料的性能时，可以观察到由于椰子木颗粒的尺寸较大，它们略低。

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引用次数: 0

Silver-graphene oxide nanocomposite-doped chitosan/PVA membrane for water treatment of Acid Blue 324 dye 银-氧化石墨烯纳米复合材料掺杂壳聚糖/PVA膜对酸性蓝324染料的水处理

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2025-10-03 DOI: 10.1080/1023666X.2025.2504554

Ebtesam A. Mohamad , Marwa A. Ramadan , Manal T. H. Moselhey

Membrane technology has garnered a lot of attention as a practical and promising approach to water filtration throughout the last 20 years. The goal of the current research was to create a chitosan-PVA membrane doped with graphene oxide and silver (GO/Ag) nanocomposite for water treatment of acid blue 324 dye. GO/Ag nanocomposite was prepared and characterized by TEM, DLS, and UV-Vis spectroscopy. Four types of membranes were prepared; chitosan (Ch), polyvinyl alcohol (PVA), Ch-PVA ,and chitosan–PVA dropped with GO/Ag. Differential scanning calorimetry (DSC), UV spectroscopy, and Fourier Transform Infrared (FTIR) techniques were used to characterize the fabricated membranes. GO/Ag Ch-PVA membranes are thermally stable, as the melting temperature of the membrane is 337.66 °C. Doping GO/Ag nanocomposite into the Ch-PVA matrix resulted in higher absorption values over the range 200–380 nm, supporting the break down dye soluble in water and acting as a photocatalyst. Dye concentrations in water and the membrane’s adsorption capacity were evaluated at different pH values and initial dye concentrations. The results indicated that compared to Ch-PVA, PVA, and Ch membranes, the GO/Ag Ch-PVA membrane absorbs the dye by 83.1%, 69.5%, and 65.4% more. Additionally, it was discovered that the produced membranes have a higher dye removal efficiency at low pH levels than the basic medium. At pH 2, the dye absorption efficiency of GO/Ag Ch-PVA is higher by 11.47%, 1.78%, and 14.84% when compared to PVA, Ch, and Ch-PVA membranes. Research findings suggested that this fabricated membrane could be an effective dye removal adsorbent.

在过去的20年里，膜技术作为一种实用而有前途的水过滤方法受到了广泛的关注。本研究的目的是制备一种掺杂氧化石墨烯和银（GO/Ag）纳米复合材料的壳聚糖-聚乙烯醇膜，用于酸性蓝324染料的水处理。制备了氧化石墨烯/银纳米复合材料，并用TEM、DLS和紫外可见光谱对其进行了表征。制备了四种不同类型的膜；壳聚糖（Ch）、聚乙烯醇（PVA）、Ch-PVA和壳聚糖-PVA随氧化石墨烯/Ag的浓度下降。利用差示扫描量热法（DSC）、紫外光谱和傅里叶变换红外（FTIR）技术对制备的膜进行了表征。氧化石墨烯/Ag Ch-PVA膜热稳定，膜的熔融温度为337.66℃。将氧化石墨烯/银纳米复合材料掺杂到Ch-PVA基体中，在200-380 nm范围内的吸收值更高，支持分解染料可溶于水，并起到光催化剂的作用。在不同的pH值和初始染料浓度下，考察了染料在水中的浓度和膜的吸附能力。结果表明，与Ch-PVA、PVA和Ch膜相比，GO/Ag Ch-PVA膜对染料的吸收率分别提高了83.1%、69.5%和65.4%。此外，还发现所制备的膜在低pH水平下比碱性介质具有更高的染料去除效率。在pH为2时，GO/Ag Ch-PVA膜的染料吸收效率分别比PVA、Ch和Ch-PVA膜高11.47%、1.78%和14.84%。研究结果表明，该膜是一种有效的染料去除吸附剂。

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引用次数: 0

Synthesis, molecular interactions, and antioxidant properties of a new terpolymer: formation of epoxy-based terpolymer composite on glass 一种新型三元共聚物的合成、分子相互作用和抗氧化性能：在玻璃上形成环氧基三元共聚物复合材料

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2025-10-03 DOI: 10.1080/1023666X.2025.2506738

Muskanbanu Mahebubkhan Baloch , Pravin Narayan Bhalerao , Yogesh T Naliapara , Sumit Kumar Jaiswal , Saad Alkahtani , Sauravendra Kumar Singh , Viral Solanki

A new chloroacetophenone-based acid-catalyzed terpolymer has been synthesized from vanillylidenacetone/4-hydroxystyryl methyl ketone, formaldehyde, and chloroacetophenone. Characterization of the terpolymer was done by using FTIR and ¹H NMR data. Thermal stability/behavior of new terpolymers determined by DSC and TGA. Ultrasonic properties, including ultrasonic velocity, density, adiabatic compressibility, specific acoustic impedance, viscosity, intermolecular free length, and relaxation time, were studied successfully in DMSO. The average molecular weight of the polymer has been reported. The antioxidant property of acetophenone-based terpolymer is reportedly against DPPH (2,2-diphenyl-1-picrylhydrazyl), with a 1.66 mg/mL IC₅₀ value. The synthesized terpolymer was used as an epoxy curing agent in a 50% weight ratio, along with DGEBA (diglycidyl ether of bisphenol A) resin at 453.15 K. The thermal stability of the epoxy-polymer composite was investigated using a TGA analysis. Chemical stability of the composite was estimated using strong acid (concentrated HCl), saturated NaOH, and NaCl solution. Surface morphology of the epoxy composite was examined using SEM analysis.

以香草烯丙酮/4-羟基苯基甲基酮、甲醛和氯苯乙酮为原料，合成了一种新的酸催化氯苯乙酮基三元共聚物。利用FTIR和1H NMR对三元共聚物进行了表征。用DSC和TGA测定新型三元共聚物的热稳定性/行为。在DMSO中成功地研究了超声性能，包括超声速度、密度、绝热压缩率、比声阻抗、粘度、分子间自由长度和弛豫时间。聚合物的平均分子量已被报道。据报道，苯乙酮基三元共聚物对DPPH（2,2-二苯基-1-吡啶酰肼）具有抗氧化性能，IC50值为1.66 mg/mL。合成的三元共聚物以50%的质量比作为环氧固化剂，与双酚a二缩水甘油酯（DGEBA）树脂在453.15 K下一起使用。采用热重分析研究了环氧树脂-聚合物复合材料的热稳定性。用强酸（浓HCl）、饱和NaOH和NaCl溶液评价复合材料的化学稳定性。用SEM分析了环氧复合材料的表面形貌。

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引用次数: 0

Immobilization of α-amylase on electrospun polycaprolactone (PCL)/chitosan (CHI) nanofibers: a novel approach to improve enzyme stability and performance 静电纺聚己内酯/壳聚糖纳米纤维固定化α-淀粉酶：一种提高酶稳定性和性能的新方法

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2025-10-03 DOI: 10.1080/1023666X.2025.2505204

Sevgi Balcıoğlu

Enhancing enzyme resistance to environmental conditions and optimizing their catalytic performance are crucial for various industrial applications. Enzyme immobilization has emerged as one of the most effective strategies to achieve these goals. In this study, polycaprolactone/chitosan (PCL/CHI) nanofibers were successfully synthesized via electrospinning, followed by the covalent immobilization of α-amylase. The immobilization efficiency was determined, and the resulting nanofibers were characterized through FT-IR, SEM, EDX, and XRD. Optimal pH and temperature conditions for the immobilized enzyme were found to be pH and 50 °C, respectively. The activation energy (Ea) calculated using the Arrhenius equation was 5.14 KJ/mol, while the kinetic parameters K_m and Vmax were determined as 0.37 ± 0.11 mg/mL and 6.23 ± 0.87 µmol/min, respectively. Thermal stability tests revealed that at 50 °C, the immobilized enzyme retained over 50% of its initial activity. Additionally, the immobilized enzyme exhibited enhanced resistance to environmental stressors, including metal ions and organic solvents, compared to its free counterpart. The results confirm that the immobilization process not only improves enzyme stability but also boosts catalytic efficiency under specific conditions. This study provides a cost-effective, scalable, and practical approach for enzyme immobilization using electrospinning, with significant potential for industrial applications.

提高酶对环境条件的抗性和优化其催化性能对各种工业应用至关重要。酶固定化已成为实现这些目标的最有效策略之一。本研究采用静电纺丝法制备了聚己内酯/壳聚糖（PCL/CHI）纳米纤维，并对α-淀粉酶进行共价固定。采用红外光谱（FT-IR）、扫描电镜（SEM）、电子能谱（EDX）和x射线衍射（XRD）对纳米纤维进行了表征。固定化酶的最佳温度和pH分别为50℃和50℃。利用Arrhenius方程计算得到的活化能Ea为5.14 KJ/mol，动力学参数Km和Vmax分别为0.37±0.11 mg/mL和6.23±0.87µmol/min。热稳定性测试表明，在50°C时，固定化酶保留了50%以上的初始活性。此外，与游离酶相比，固定化酶对环境应激因子（包括金属离子和有机溶剂）的抵抗力增强。结果证实，在特定条件下，固定化过程不仅提高了酶的稳定性，而且提高了催化效率。本研究为静电纺丝固定化酶提供了一种经济、可扩展、实用的方法，具有重要的工业应用潜力。

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引用次数: 0

Alkyd resins from Argemone mexicana seed oil: synthesis and characterization for use in anticorrosive coating applications 墨西哥银总黄酮籽油醇酸树脂：用于防腐涂料的合成和表征

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2025-10-03 DOI: 10.1080/1023666X.2025.2504559

Parineeta Das , Nirmala Devi

Argemone mexicana (AM) seed oil was extracted using petroleum ether as an effective solvent, with a yield of 20.345%. Alkyd resins derived from AM seed oil were synthesized by the alcoholysis-polyesterification method. By measuring the acid value at different times throughout the reaction, the reaction’s progress was investigated. The oil and resins underwent additional characterization using techniques such as GPC,¹H NMR, FT-IR, and GC-MS to determine the molecular weight, structure, and fatty acid composition, respectively. Research was conducted to determine how the presence of maleic anhydride in the resins affected the wettability, anticorrosion, and curing characteristics of the resins and cured films. By mixing alkyd resin with epoxy resin and gradually raising the temperature from 60 °C to 210 °C, the alkyd resins were cured. For several days, alkyd resin-coated mild steel plates demonstrated effective corrosion resistance. The water contact angle (WCA) was measured to assess the wettability of cured films. Higher maleic anhydride content improved performance in paint and surface coatings. Synthetic alkyd resins from AM seed oil showed potential for salt-corrosion resistance, which can be used in marine vessel finishes.

以石油醚为有效溶剂，提取银银酮（AM）籽油，得率为20.345%。以AM籽油为原料，采用醇解-聚合法制备醇酸树脂。通过测定反应过程中不同时间的酸值，考察反应过程。利用GPC、1H NMR、FT-IR和GC-MS等技术对油和树脂进行了额外的表征，分别确定了分子量、结构和脂肪酸组成。研究了树脂中马来酸酐的存在对树脂和固化膜的润湿性、防腐性能和固化特性的影响。将醇酸树脂与环氧树脂混合，温度从60℃逐渐升高到210℃，进行醇酸树脂固化。几天来，醇酸树脂涂层软钢板显示出有效的耐腐蚀性。通过测定水接触角（WCA）来评价固化膜的润湿性。较高的马来酸酐含量改善了油漆和表面涂料的性能。以AM籽油为原料合成的醇酸树脂具有良好的耐盐腐蚀性能，可用于船舶表面处理。

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引用次数: 0

Poly(ethylene-co-methacrylic acid) ionomer dynamic phase composition and polymer chain mobility characterization by time domain NMR 聚乙烯-共甲基丙烯酸离聚体动态相组成及聚合物链迁移率的时域核磁共振表征

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2025-10-03 DOI: 10.1080/1023666X.2025.2462057

Chen Zheng , Yifan Xu , Zheng Zhang , Qiangqiang Yan , Amy Song , Xiaohua Qiu , Nathan Rau , Ray Drumright

We report a convenient approach for characterizing poly(ethylene-co-methacrylic acid) (EMAA) using time domain NMR. The T₂ relaxation curve of EMAA can be obtained by the Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence and analyzed with a three-component model. The dynamic phase distribution (the aggregation of relaxation components with similar mobility) and overall polymer chain mobility results showed good agreement with well-known EMAA ionomer properties and Hahn Echo pulse sequence experiments. Subsequently, plasticizer's impact on the EMAA network was studied with the method established here. Plasticizer-induced dynamic phase redistribution and chain mobility changes can be revealed by time domain NMR (TD NMR) analysis, enabling researchers to better understand the plasticizer–polymer interaction mechanism. In conclusion, TD NMR characterization of EMAA polymers provided a new perspective on the structural features and dynamics of these materials. The method has the potential to be adopted in R&D labs, processing labs, or plant quality assurance/quality control.

我们报道了一种用时域核磁共振表征聚乙烯-共甲基丙烯酸（EMAA）的简便方法。通过carr - purcell - meiboomm - gill （CPMG）脉冲序列得到EMAA的T2弛豫曲线，并采用三分量模型进行分析。动态相分布（具有相似迁移率的弛豫组分聚集）和聚合物整体链迁移率结果与已知的EMAA离聚体性质和Hahn Echo脉冲序列实验结果吻合良好。随后，用本文建立的方法研究了增塑剂对EMAA网络的影响。通过时域核磁共振（TD NMR）分析可以揭示增塑剂诱导的动态相重分布和链迁移率变化，使研究人员能够更好地了解增塑剂与聚合物的相互作用机理。总之，EMAA聚合物的TD NMR表征为这些材料的结构特征和动力学提供了新的视角。该方法有可能在研发实验室、加工实验室或工厂质量保证/质量控制中采用。

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引用次数: 0

Structural and surface characteristics of P(4-CAni)/g-C3N4 nanocomposite films for optoelectronic devices 光电子器件用P(4-CAni)/g-C3N4纳米复合膜的结构和表面特性

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2025-09-03 DOI: 10.1080/1023666X.2025.2550565

A. Atta , Reem Altuijri , Nuha Al-Harbi , M. M. Abdelhamied

In this work, the P(4-CAni)/(g-C₃N₄) films, which are composed of poly 4-chloroaniline P(4-CAni) and graphitic carbon nitride (g-C₃N₄), were successfully prepared utilizing the oxidative polymerization method. The EDX, TEM, and FTIR proved that the P(4-CAni)/(g-C₃N₄) nanocomposite was successfully synthesized. The EDX showed the chemical compositions of the elements C, N, O, S, and Cl in the fabricated composite P(4-ClAni)/g-C₃N₄. Moreover, the TEM shows the P(4-ClAni) nanoparticles have nanosheet sizes in a range of 20–30 nm, while the g-C₃N₄ is in the range of 62–85 nm. The surface free energy rose from 22.22 mJ/m² for P(4-ClAni) to 40.67 mJ/m² for P(4-ClAni)/g-C₃N_4, and the water contact angle reduced from 90.8° to 67.2°. By mixing P(4-ClAni) with 1.5%, 3%, and 4.5% of g-C₃N₄, the band tail energy is enhanced from 0.85 eV for P(4-ClAni) to 1.58 eV, 2.15 eV, and 2.70 eV, correspondingly, while the energy gap is reduced from 3.67 eV to 3.48, 3.34, and 3.13 eV. This study confirmed the P(4-ClAni)/g-C₃N₄ composite films can be used as optical materials for flexible electronic devices.

采用氧化聚合法制备了由聚4-氯苯胺P（4-CAni）和石墨氮化碳（g-C3N4）组成的P(4-CAni)/(g-C3N4)薄膜。EDX、TEM、FTIR等表征手段证明了P(4-CAni)/(g-C3N4)纳米复合材料的成功合成。EDX显示了复合材料P(4-ClAni)/g-C3N4中C、N、O、S和Cl元素的化学组成。透射电镜显示，P（4-ClAni）纳米颗粒的纳米片尺寸在20 ~ 30 nm之间，g-C3N4纳米片尺寸在62 ~ 85 nm之间。表面自由能从P（4-ClAni）的22.22 mJ/m2上升到P(4-ClAni)/g-C3N4的40.67 mJ/m2，水接触角从90.8°减小到67.2°。将P（4-ClAni）与1.5%、3%和4.5%的g-C3N4混合后，P（4-ClAni）的能带尾能分别从0.85 eV提高到1.58 eV、2.15 eV和2.70 eV，能隙从3.67 eV减小到3.48 eV、3.34 eV和3.13 eV。本研究证实了P(4-ClAni)/g-C3N4复合薄膜可作为柔性电子器件的光学材料。

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引用次数: 0

Investigating the effect of glass filler on the aging behavior of polymer powders for additive manufacturing 研究了玻璃填料对增材制造用聚合物粉体老化性能的影响

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2025-07-09 DOI: 10.1080/1023666X.2025.2522076

John Duffy , Serena Agostini , Ryan Brown , Candice Majewski , Shona Marsh , Natalie Rudolph

Powdered-polymer additive manufacturing processes, including selective laser sintering, high-speed sintering, and multijet fusion, have seen increasing usage throughout a range of industries, with corresponding requirements for better knowledge of material and component behavior. These processes involve the preheating, and subsequent selective melting, of consecutive layers of powder. Upon completion of the manufacturing process, unmelted powder can be recovered from the build chamber and, depending on its quality, reused for future part manufacture. Powder recovered in such a way can undergo a number of changes as a result of being held at elevated temperatures for extended times during the manufacturing process. Previous research has investigated these effects for polymer powders, with a particular emphasis on the most common polymer additive manufacturing powder, Nylon-12. In this work, we use a variety of characterization techniques, specifically size exclusion chromatography, differential scanning calorimetry, and rotational rheometry, to investigate this behavior for a glass-filled nylon-12 material, in order to identify any effects of the glass filler on material changes and on the properties of parts produced using these materials.

粉末聚合物增材制造工艺，包括选择性激光烧结、高速烧结和多射流熔合，已经在一系列行业中得到越来越多的应用，相应的要求是更好地了解材料和组件的行为。这些过程包括对连续的粉末层进行预热和随后的选择性熔化。在制造过程完成后，未熔化的粉末可以从构建室中回收，并根据其质量，重新用于未来的零件制造。以这种方式回收的粉末在制造过程中由于在高温下保持较长时间而发生许多变化。先前的研究已经调查了聚合物粉末的这些影响，特别强调了最常见的聚合物增材制造粉末尼龙-12。在这项工作中，我们使用了各种表征技术，特别是尺寸排除色谱法，差示扫描量热法和旋转流变法，来研究玻璃填充尼龙-12材料的这种行为，以确定玻璃填料对材料变化和使用这些材料生产的部件性能的任何影响。

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