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Synthesis, characterization and dielectric properties of polymer nanocomposites for energy storage applications 用于储能应用的聚合物纳米复合材料的合成、表征和介电性能
IF 2.4 4区 工程技术 Q2 POLYMER SCIENCE Pub Date : 2024-07-22 DOI: 10.1007/s13233-024-00298-y
E. Abdeltwab, A. Atta, Nuha Al-Harbi, M. M. Abdelhamied

In this project, the oxidative chemical polymerization method is used to prepare polymer composite that consisting of polypyrrole polymer (PPy) and iron oxide nanoparticles (Fe2O3NPs). Then deposited this blend (PPy/Fe2O3) onto the PET substrate to creating flexible nanocomposite PET/(PPy/Fe2O3). Analyzing the samples using X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) proves that the composite was effectively formed. With varying Fe2O3 ratios, the dielectric parameters of PET polymer and PET/(PPy/Fe2O3) composite have been documented at frequencies of 40–5.6 MHz. The surface properties were significantly enhanced by irradiation. The surface free energy increases from 41.36 mJ/m2 to 66.23 mJ/m2 and water contact angle reduces from 58.36° for PET to 39.25°. The results demonstrated that the composite surface characteristics were enhanced as the concentration of Fe2O3 changed. The obtained data showed that the fabricated samples have better properties than the PET films that can be utilized in many applications as capacitors and storage devices.

Graphical abstract

a SEM of PET, b SEM of PPy/Fe2O3, c SEM of PET/(PPy/Fe2O3, d contact angle with ratiosof Fe2O3 and e surface free energy with ratios of Fe2O3

本项目采用氧化化学聚合法制备由聚吡咯聚合物(PPy)和氧化铁纳米颗粒(Fe2O3NPs)组成的聚合物复合材料。然后将这种混合物(PPy/Fe2O3)沉积到 PET 基质上,制成柔性纳米复合 PET/(PPy/Fe2O3)。利用 X 射线衍射 (XRD) 和傅立叶变换红外光谱 (FTIR) 分析样品,证明复合材料已有效形成。随着 Fe2O3 比例的变化,记录了 PET 聚合物和 PET/(PPy/Fe2O3)复合材料在 40-5.6 MHz 频率下的介电参数。辐照显著增强了表面特性。表面自由能从 41.36 mJ/m2 增加到 66.23 mJ/m2,水接触角从 PET 的 58.36° 减小到 39.25°。结果表明,随着 Fe2O3 浓度的变化,复合材料的表面特性得到了增强。所获得的数据表明,制备的样品比 PET 薄膜具有更好的性能,可以作为电容器和存储设备广泛应用。
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引用次数: 0
Screen printing and electrical properties of silver paste using a robust biopolymer binder for fine line electrode in energy devices 使用坚固的生物聚合物粘合剂丝网印刷用于能源设备细线电极的银浆及其电气性能
IF 2.4 4区 工程技术 Q2 POLYMER SCIENCE Pub Date : 2024-07-05 DOI: 10.1007/s13233-024-00296-0
Young Sil Lee, Ju Hwan An, Kwan Han Yoon

The purpose of this study is to identify factors affecting the dispersion and printing properties of pastes that are required to form fine line width electrodes by controlling the rheological properties of pastes applied in various fields. In particular, to solve the problem of high cost and low efficiency of silver used in the front electrode of silicon solar cells, it is necessary to print uniform fine lines with high aspect ratio to achieve higher efficiency while reducing raw material consumption. In this study, ethyl cellulose (EC), a conventional general-purpose binder, and xanthan gum (XG), which is widely used as a thickener in the food industry and has excellent temperature stability and the advantage of having a high viscosity even with a small content, used as binders. An organic solution was prepared by completely dissolving the binder in a solvent, and then inorganic particles and glass flecks were added to prepare the final paste. The rheological properties of the paste were measured, and the aspect ratio and the electrical conductivity of the electrodes were assessed after screen printing and firing. The results indicated that the paste prepared with XG binder exhibited a higher overall viscosity compared to the paste with EC binder and demonstrated a superior shear-thinning behavior. The pastes with optimal printing properties were found to contain 12 wt% EC and 7 wt% XG, respectively. In the frequency sweep test, XG had higher G' and G'' than EC, showing relatively good sedimentation stability and high aspect ratio. Viscosity recovery through hysteresis test was also better for XG than EC. For the final electrical conductivity, both EC and XG showed a value of 103 Ω⋅m order. However, if the electrodes were formed from a paste made of XG, the final solar cell efficiency is expected to be higher due to the larger area receiving sunlight due to the high aspect ratio.

Graphical Abstract

This study investigates the rheological properties of pastes formulated with ethyl cellulose and xanthan gum for screen-printed electrodes in silicon solar cell fabrication. Xanthan gum-based pastes exhibit higher viscosity and better shear thinning behavior compared to ethyl cellulose-based pastes, with optimal printing properties observed at 7 wt% xanthan gum content. The findings suggest that utilizing xanthan gum-based pastes could lead to higher efficiency in silicon solar cells due to the potential for achieving larger aspect ratio electrodes

本研究的目的是通过控制应用于不同领域的浆料的流变特性,找出影响浆料分散和印刷特性的因素,以形成细线宽电极。特别是,为了解决硅太阳能电池前电极用银成本高、效率低的问题,有必要印刷出高宽比的均匀细线,从而在降低原材料消耗的同时实现更高的效率。在这项研究中,使用了传统的通用粘合剂乙基纤维素(EC)和黄原胶(XG)作为粘合剂,黄原胶在食品工业中被广泛用作增稠剂,具有优异的温度稳定性和即使含量较少也具有高粘度的优点。先将粘合剂完全溶解在溶剂中,制备成有机溶液,然后加入无机颗粒和玻璃碎片,制备成最终的糊状物。测量了浆糊的流变特性,并评估了丝网印刷和烧制后电极的长宽比和导电性。结果表明,使用 XG 粘合剂制备的浆料与使用 EC 粘合剂制备的浆料相比具有更高的总体粘度,并表现出优异的剪切稀化性能。具有最佳印刷性能的浆料分别含有 12 wt% 的 EC 和 7 wt% 的 XG。在扫频测试中,XG 的 G' 和 G'' 比 EC 高,显示出相对较好的沉降稳定性和高纵横比。通过滞后测试,XG 的粘度恢复也比 EC 好。在最终电导率方面,EC 和 XG 的值均为 103 Ω⋅m 级。然而,如果电极是由 XG 制成的浆料形成的,由于高宽比,接受太阳光的面积更大,因此最终的太阳能电池效率预计会更高。 图解 摘要 本研究调查了用乙基纤维素和黄原胶配制的浆料在硅太阳能电池丝网印刷电极制造中的流变特性。与乙基纤维素浆料相比,黄原胶浆料具有更高的粘度和更好的剪切稀化性能,在黄原胶含量为 7 wt% 时可观察到最佳印刷性能。研究结果表明,利用黄原胶基浆料可以实现更大长宽比的电极,从而提高硅太阳能电池的效率。
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引用次数: 0
Drug release and physical properties of double layers coated contact lenses using natural polymers 使用天然聚合物的双层镀膜隐形眼镜的药物释放和物理特性
IF 2.8 4区 工程技术 Q2 POLYMER SCIENCE Pub Date : 2024-07-04 DOI: 10.1007/s13233-024-00289-z
Hye Ji Kim, Hyun Mee Lee

This study aims to develop contact lenses with improved drug-release duration time by layer-by-layer (LBL) coating with natural polymers on contact lenses containing the drug gatifloxacin. LBL coating was performed in single and double layers on contact lenses containing gatifloxaxin using natural polymers carrageenan and polylysine. The performance of contact lenses was evaluated based on various physical properties and antibacterial properties. As a result, contact lenses containing gatifloxacin have reduced physical properties compared to lenses without gatifloxacin. As the concentration of gatifloxacin increased, oxygen permeability and wettability decreased, and antibacterial properties increased. LBL coating improved the wettability and antibacterial properties of contact lenses and increased the drug-release duration. Double-layers coated lenses increased the duration of drug release more than single-coated lenses.

Graphic Abstract

Double layer-coating with poly-L-lysine and carrageenan on contact lenses

本研究旨在通过在含有药物加替沙星的隐形眼镜上使用天然聚合物进行逐层涂布(LBL),开发出药物释放持续时间更长的隐形眼镜。使用天然聚合物卡拉胶和聚赖氨酸对含有加替沙星的隐形眼镜进行了单层和双层 LBL 涂层。根据各种物理特性和抗菌特性对隐形眼镜的性能进行了评估。结果显示,与不含加替沙星的隐形眼镜相比,含加替沙星的隐形眼镜的物理性质有所下降。随着加替沙星浓度的增加,透氧性和润湿性降低,而抗菌性增加。LBL 涂层改善了隐形眼镜的润湿性和抗菌性,并延长了药物释放时间。双层镀膜镜片比单层镀膜镜片更能延长药物释放的持续时间。 图文摘要隐形眼镜上的聚左旋赖氨酸和卡拉胶双层镀膜
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引用次数: 0
BioZnMOFs dispersed in collagen-starch hydrogels: a stimulating approach for animal and plant tissue growth 分散在胶原-淀粉水凝胶中的 BioZnMOFs:一种促进动植物组织生长的方法
IF 2.4 4区 工程技术 Q2 POLYMER SCIENCE Pub Date : 2024-07-01 DOI: 10.1007/s13233-024-00293-3
Valeria G. Oyervides-Guajardo, Jesús A. Claudio-Rizo, Denis A. Cabrera-Munguía, Martín Caldera-Villalobos, Tirso E. Flores-Guia, Florentino Soriano-Corral, Adán Herrera-Guerrero

The utilization of bio-derived zinc metal–organic frameworks (bioZnMOFs) as crystalline materials represents an advanced innovation with dual significance in both physicochemical and biological realms. BioZnMOFs based on essential amino acids such as l-phenylalanine, l-histidine, and l-tryptophan were dispersed in collagen–starch hydrogels (mass ratio 1%) to generate the materials ZnF, ZnH, and ZnT, respectively. Using solid-state 13C NMR, the chemical components of these systems were identified. The surface structure of these biomatrices was inspected by SEM, indicating that ZnT generates the largest occluded clusters. EDS analysis revealed that Zn(II) ions are uniformly distributed in all the semi-IPN biomatrices. WAXS analysis demonstrated a semi-crystalline structure, while FTIR analysis revealed that the ZnH matrix shows the greatest physicochemical interaction processes, benefiting crosslinking (40 ± 5%), swelling (4900 ± 510%), storage modulus (1000 Pa at 35 Hz), and reduced gelation time (10 ± 1 min) in this biomatrix. These materials display slow degradation in collagenase-rich environments and vegetable substrate. ZnH and ZnT matrices stimulate monocyte metabolism, while ZnF and ZnH actively promote fibroblast metabolism, encouraging proliferation at 48 h. ZnT shows modulation of IL-10 and TNF-α cytokine secretion in monocytes, suggesting its potential in wound healing applications. Additionally, the ZnT matrix enhances tomato root cell metabolism and proliferation. After 30 days, plants growing on ZnT matrices exhibit larger stem diameters and more leaves, showcasing their agricultural potential. Overall, these bioZnMOF-based materials offer versatile solutions with promising applications in biomedicine and agriculture.

Graphical abstract

利用生物锌金属有机框架(bioZnMOFs)作为晶体材料是一项先进的创新,在物理化学和生物学领域具有双重意义。以l-苯丙氨酸、l-组氨酸和l-色氨酸等必需氨基酸为基础的生物锌金属有机框架被分散在胶原-淀粉水凝胶(质量比为1%)中,分别生成了ZnF、ZnH和ZnT材料。利用固态 13C NMR,确定了这些系统的化学成分。扫描电子显微镜检查了这些生物团块的表面结构,结果表明 ZnT 生成的闭合团块最大。EDS 分析表明,锌(II)离子均匀地分布在所有半 IPN 生物团块中。WAXS 分析显示了半晶体结构,而傅立叶变换红外光谱分析显示,ZnH 基质显示了最大的物理化学相互作用过程,有利于该生物基质的交联(40 ± 5%)、膨胀(4900 ± 510%)、存储模量(1000 Pa,35 Hz)和凝胶化时间缩短(10 ± 1 分钟)。这些材料在富含胶原酶的环境和植物基质中降解缓慢。ZnH 和 ZnT 基质能刺激单核细胞的新陈代谢,而 ZnF 和 ZnH 则能积极促进成纤维细胞的新陈代谢,在 48 小时内促进其增殖。ZnT 能调节单核细胞中 IL-10 和 TNF-α 细胞因子的分泌,这表明它在伤口愈合方面具有应用潜力。此外,ZnT 基质还能促进番茄根细胞的新陈代谢和增殖。30 天后,生长在 ZnT 基质上的植物表现出更大的茎干直径和更多的叶片,显示出其农业潜力。总之,这些基于生物 ZnMOF 的材料提供了多功能解决方案,在生物医学和农业领域具有广阔的应用前景。
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引用次数: 0
Characterization of mechanical, thermal and rheological properties of silica-based nanocomposite filled thermoplastic polyurethane film 硅基纳米复合填充热塑性聚氨酯薄膜的机械、热和流变特性表征
IF 2.8 4区 工程技术 Q2 POLYMER SCIENCE Pub Date : 2024-07-01 DOI: 10.1007/s13233-024-00286-2
Sanghee Kim

The objective of this study is to investigate the effects of incorporating negatively charged core–shell type SiOx/PS (silicate core/polystyrene shell) nanoparticles on the mechanical, thermal, and rheological properties of a non-commercial thermoplastic polyurethane (TPU, pristine 9094) film. TPU-SiOx/PS nanocomposites were fabricated by blending pristine 9094 TPU-based resin with SiOx/PS nanoparticles of 1, 2, and 3 wt% loading and prepared as sheet-type films via T-die extrusion. The dispersion of SiOx/PS nanoparticles within the TPU matrix was confirmed using FTIR (Fourier-Transform Infrared Spectroscopy) and zeta potential (ζ) analysis. Results showed peaks assigned to benzene ring (698 cm−1, 1638 cm−1) in the polystyrene structure, with a shift in zeta potential (ζ) from + 19.77 mV (pristine) to −13.30 mV (1 wt%) and −6.42 mV (2 wt%). At 2 wt%, the SiOx/PS-TPU film exhibited an increase of 13.2% in yield strength and 20.1% in Young’s modulus compared to pristine 9094 film. This loading also yielded the highest increases in storage modulus (G′) and complex viscosity (η). The decrease in the slope of G′ from G′ ~ ω1.67 (pristine 9094) to G′ ~ ω1.62 (2wt%) reflects the reinforcement of polymer chains and enhanced elasticity. Increases in Tg,SS (glass transition temperature of soft segment) and decreases in Tg,HS (glass transition temperature of hard segment) suggest enhanced interactions between SiOx/PS nanoparticles and polymer chains. Finally, a 2 wt% loading enables the mechanical and rheological properties of the pristine 9094 TPU film comparable to those of the commercial pristine 49,510 TPU film.

Graphical abstract

TPU-nanocomposite film through T-die extrusion process

本研究旨在探讨加入带负电荷的核壳型 SiOx/PS(硅酸盐核/聚苯乙烯壳)纳米粒子对非商业热塑性聚氨酯(TPU,原始 9094)薄膜的机械、热和流变特性的影响。将原始 9094 热塑性聚氨酯树脂与 SiOx/PS 纳米粒子(负载量分别为 1、2 和 3 wt%)混合,制成热塑性聚氨酯-SiOx/PS 纳米复合材料,并通过 T 型模具挤出制备成片状薄膜。傅立叶变换红外光谱(FTIR)和ZETA电位(ζ)分析证实了SiOx/PS纳米粒子在热塑性聚氨酯基质中的分散情况。结果显示,聚苯乙烯结构中出现了苯环峰(698 cm-1,1638 cm-1),zeta 电位(ζ)从+ 19.77 mV(原始)变为-13.30 mV(1 wt%)和-6.42 mV(2 wt%)。与原始 9094 薄膜相比,SiOx/PS-TPU 薄膜在 2 wt% 时的屈服强度提高了 13.2%,杨氏模量提高了 20.1%。这种添加量也使储存模量(G′)和复合粘度(η)的增幅最大。G′ 的斜率从 G′ ~ ω1.67(原始 9094)下降到 G′ ~ ω1.62(2wt%),反映了聚合物链的增强和弹性的提高。Tg,SS(软段的玻璃化转变温度)的升高和 Tg,HS(硬段的玻璃化转变温度)的降低表明 SiOx/PS 纳米粒子与聚合物链之间的相互作用增强。最后,2 wt% 的添加量使原始 9094 热塑性聚氨酯薄膜的机械和流变特性可与商用原始 49,510 热塑性聚氨酯薄膜相媲美。 图表摘要 通过 T 型模具挤出工艺制备热塑性聚氨酯纳米复合薄膜
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引用次数: 0
Thermal conductivity of polyaniline reinforced epoxy resin 聚苯胺增强环氧树脂的导热性能
IF 2.8 4区 工程技术 Q2 POLYMER SCIENCE Pub Date : 2024-06-26 DOI: 10.1007/s13233-024-00288-0
Youngwoo Cha, Munju Goh

This study introduces the possibility of using polyaniline as a thermally conductive filler in the manufacturing process of composites using epoxy. Compared to conventional thermally conductive fillers, polyaniline is a material with a simple synthesis process and is cost-effective. In this experiment, among various types of polyaniline, polyaniline in the form of an emeraldine salt (ES) doped with protons and polyaniline in the form of a dedoped neutral emeraldine base (EB) were used as the thermally conductive filler. ES doped with protons show higher electrical and thermal conductivity than EB due to the conductive polymer characteristics in which the thermal conductivity increases as the electrical conductivity increases. We put both fillers into the widely commercially available diglycidyl ether of bisphenol A (DGEBA) epoxy composite, and analyzed the effect of the thermal conductivity of the filler increased by doping on the thermal conductivity of the composite, and analyzed the possibility of use as a thermally conductive filler. The epoxy resin without filler was measured to have the thermal conductivity of 0.21 W/m K, the thermal conductivity of the composite reinforced with EB filler was measured to be 0.27 W/m K, and the thermal conductivity of the composite reinforced with ES filler was measured to be 0.29 W/m K. The results confirmed that the input of polyaniline as a thermally conductive filler could improve the thermal conductivity of the composite, and also confirmed that the proton-doped ES filler showed higher thermal conductivity than the neutral EB filler. Through this study, we highlight the possibility that polyaniline can be used as a promising thermally conductive filler for various composite materials.

Graphical abstract

Proton-doped polyanilines, when used as thermally conductive fillers in epoxy composites, increase thermal conductivity more effectively than dedoped polyanilines

本研究介绍了在使用环氧树脂的复合材料制造过程中使用聚苯胺作为导热填料的可能性。与传统的导热填料相比,聚苯胺是一种合成工艺简单、成本效益高的材料。在本实验中,各种类型的聚苯胺中,掺杂质子的祖母绿盐(ES)形式的聚苯胺和掺杂中性祖母绿碱(EB)形式的聚苯胺被用作导热填料。与 EB 相比,掺杂质子的 ES 具有更高的导电性和导热性,这是因为导电性聚合物具有导热性随导电性增加而增加的特性。我们将这两种填料放入市场上广泛销售的双酚 A 二缩水甘油醚(DGEBA)环氧树脂复合材料中,分析了通过掺杂增加的填料热导率对复合材料热导率的影响,并分析了用作导热填料的可能性。测量结果表明,不添加填料的环氧树脂的导热系数为 0.21 W/m.K,添加 EB 填料增强的复合材料的导热系数为 0.27 W/m.K,添加 ES 填料增强的复合材料的导热系数为 0.29 W/m.K。通过这项研究,我们强调了将聚苯胺作为一种有前途的导热填料用于各种复合材料的可能性。 图表摘要
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引用次数: 0
Retraction Note: Hollow fiber membrane contactor based carbon dioxide absorption − stripping: a review 撤回说明:基于中空纤维膜接触器的二氧化碳吸收-剥离:综述
IF 2.8 4区 工程技术 Q2 POLYMER SCIENCE Pub Date : 2024-06-25 DOI: 10.1007/s13233-024-00294-2
I. M. R. Fattah, Zainab A. Farhan, Karolos J. Kontoleon, Ehsan kianfar, Salema K. Hadrawi
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引用次数: 0
Bridging the future: unveiling the latest innovations in ethylene vinyl acetate blends and composites through electron beam irradiation—a comprehensive review 连接未来:通过电子束辐照揭示乙烯-醋酸乙烯共混物和复合材料的最新创新--综合评述
IF 2.4 4区 工程技术 Q2 POLYMER SCIENCE Pub Date : 2024-06-25 DOI: 10.1007/s13233-024-00292-4
Jawad Ahmed, Sidra Mushtaq

High energy radiation processing has proven to be remarkably effective in enhancing the properties of polymeric materials. Specially, electron beam (E-beam) radiation stands out as a versatile technique for crosslinking, compatibilizing, and grafting polymer blends and composites. Its reputation for simplicity, high speed, environmental friendliness, and user-friendliness has made it the preferred method in industries such as automotive, electrical insulation, ink curing, surface modification, food packaging, medical sterilization, and healthcare. This review focuses on recent advancements in the application of E-beam irradiation to ethylene vinyl acetate (EVA) blends and composites, with a specific focus on incorporating partially nanoscale clay to achieve desired properties and the controlled crosslinking of blends and nanocomposites using high-energy radiation. Numerous studies have investigated the development and modification of EVA with various thermoplastic and elastomeric polymers, highlighting radiation-induced grafting of different monomers onto the polymer backbone. The review primarily examines the utilization of EVA blends and composites for the purpose of adjusting their physical, chemical, thermal, surface, and structural properties. Additionally, it investigates the formation of crosslinking by analyzing gel content and optimizing the dosage of crosslinking co-agents and fillers. Furthermore, the study explores the effect of E-beam irradiation on the tensile properties, specifically the enhancement of tensile strength resulting from crosslinking formation at varying E-beam radiation doses. Additionally, the diverse applications of high-energy radiation-modified polymers in industries such as automotive, wire and cable insulation, heat shrinkable tubes, sterilization, biomedical, nuclear, and space industries are discussed. These applications demonstrate the extensive potential and practicality of utilizing high-energy radiation processing to enhance the properties of polymeric materials in various industrial settings.

Graphical abstract

Effects of electron beam irradiation on ethylene vinyl acetate blends and composites.

事实证明,高能辐射处理在提高聚合物材料的性能方面非常有效。特别是电子束(E-beam)辐照,它是一种用于聚合物混合物和复合材料交联、相容和接枝的多功能技术。它以简便、高速、环保和用户友好而著称,已成为汽车、电气绝缘、油墨固化、表面改性、食品包装、医疗消毒和保健等行业的首选方法。本综述将重点介绍电子束辐照在乙烯-醋酸乙烯(EVA)共混物和复合材料应用方面的最新进展,特别关注如何加入部分纳米级粘土以实现所需的性能,以及如何利用高能辐射控制共混物和纳米复合材料的交联。大量研究调查了 EVA 与各种热塑性聚合物和弹性聚合物的开发和改性,重点关注不同单体在聚合物骨架上的辐射诱导接枝。本综述主要探讨了如何利用 EVA 混合物和复合材料来调整其物理、化学、热、表面和结构特性。此外,研究还通过分析凝胶含量和优化交联助剂和填料的用量来研究交联的形成。此外,该研究还探讨了电子束辐照对拉伸性能的影响,特别是在不同电子束辐照剂量下,交联的形成会增强拉伸强度。此外,还讨论了高能辐射改性聚合物在汽车、电线电缆绝缘、热缩管、消毒、生物医学、核工业和航天工业等行业的多种应用。这些应用表明,在各种工业环境中利用高能辐射加工提高聚合物材料的性能具有广泛的潜力和实用性。 图文摘要电子束辐照对乙烯-醋酸乙烯共混物和复合材料的影响。
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引用次数: 0
Multiscale acoustical study on graphene oxide impregnated polyurethane foam 浸渍氧化石墨烯聚氨酯泡沫的多尺度声学研究
IF 2.8 4区 工程技术 Q2 POLYMER SCIENCE Pub Date : 2024-06-24 DOI: 10.1007/s13233-024-00281-7
Sung Soo Yang, Inhwa Jung, Yeon June Kang

This study examines the multiscale acoustic properties of sound-absorbing polyurethane (PU) foam impregnated with graphene oxide (GO). GO impregnation into the PU foam was achieved through a vacuum-assisted process. The effects of GO impregnation on the macroscopic acoustic behavior, transport parameters, and sound absorption coefficients were investigated. Scanning electron microscopy images revealed that the impregnated GO enveloped the open pores within the porous structure. Geometric parameters derived from the microstructural observations were used to perform acoustic simulations. Models with partially open cells could be used to accurately predict the transport parameters and sound absorption coefficients of foams with low levels of GO impregnation. For foams with high levels of GO impregnation, it was necessary to incorporate closed cells into the model, which significantly enhanced the prediction accuracy for the transport parameters and sound absorption coefficients. This study advances our understanding of the acoustic properties of GO-impregnated PU foams and will be beneficial for developing more effective sound-absorbing materials.

Graphical abstract

Acoustical characterization of graphene oxide impregnated polyurethane foam

本研究探讨了浸渍氧化石墨烯(GO)的吸音聚氨酯(PU)泡沫的多尺度声学特性。氧化石墨烯是通过真空辅助工艺浸渍到聚氨酯泡沫中的。研究了浸渍 GO 对宏观声学行为、传输参数和吸声系数的影响。扫描电子显微镜图像显示,浸渍的 GO 包覆了多孔结构中的开放孔隙。根据微观结构观察得出的几何参数被用于进行声学模拟。具有部分开放孔隙的模型可用于准确预测浸渍了少量 GO 的泡沫的传输参数和吸声系数。对于浸渍了大量 GO 的泡沫,有必要在模型中加入闭孔,这样可以显著提高传输参数和吸声系数的预测精度。这项研究加深了我们对浸渍 GO 的聚氨酯泡沫声学特性的理解,将有助于开发更有效的吸音材料。 图文摘要浸渍氧化石墨烯聚氨酯泡沫的声学表征
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引用次数: 0
Amine detection via PDMS swelling in CNT/PDMS strain sensors 通过 CNT/PDMS 应变传感器中的 PDMS 膨胀进行胺检测
IF 2.8 4区 工程技术 Q2 POLYMER SCIENCE Pub Date : 2024-06-24 DOI: 10.1007/s13233-024-00290-6
Youjin Song, Donghyeon Lee, Hyunjoo Seo, Jeewoo Lim, Byungjin Koo

The amine sensing is of critical importance in food safety, environmental protection, and national security. We herein report our novel approach to amine detection based on swelling parameters and strain sensors. Specifically, we prepared strain sensors using poly(3-hexylthiophene) (P3HT), single-walled carbon nanotube (CNT), and polydimethylsiloxane (PDMS). P3HT-wrapped CNTs were produced in chloroform, and this solution was drop-casted onto PDMS pads, followed by attaching copper electrodes, resulting in CNT/PDMS strain sensors. It has been well documented that PDMS possesses matching solubility parameters with diisopropylamine, and we discovered that diisopropylamine caused the most significant swelling of the PDMS pad compared to the other seven solvents/chemicals used in this study. The swelling of PDMS induced by diisopropylamine resulted in a large increase in electrical resistance (R/R0 ~ 2.21, wherein R and R0 represent the resistances before and after swelling, respectively), probably due to the transmitted stress/strain from PDMS swelling and thus the perturbation of the CNT networks. This study offers a new method for fabricating chemical sensors utilizing strain based on polymer swelling.

Graphical Abstract

The swelling of PDMS induced by various solvents/chemicals was recorded as changes in resistivity, leading to the fabrication of strain-based chemical sensors.

胺传感对食品安全、环境保护和国家安全至关重要。我们在此报告基于溶胀参数和应变传感器的胺检测新方法。具体来说,我们利用聚(3-己基噻吩)(P3HT)、单壁碳纳米管(CNT)和聚二甲基硅氧烷(PDMS)制备了应变传感器。在氯仿中制备出包裹 P3HT 的碳纳米管,然后将这种溶液滴铸到 PDMS 衬垫上,再连接铜电极,就制成了碳纳米管/PDMS 应变传感器。有资料表明,PDMS 与二异丙基胺的溶解参数相匹配,我们发现,与本研究中使用的其他七种溶剂/化学品相比,二异丙基胺对 PDMS 垫的溶胀作用最为显著。二异丙基胺引起的 PDMS 膨胀导致电阻大幅增加(R/R0 ~ 2.21,其中 R 和 R0 分别代表膨胀前和膨胀后的电阻),这可能是由于 PDMS 膨胀产生的传递应力/应变从而扰动了 CNT 网络。该研究为利用基于聚合物溶胀的应变制造化学传感器提供了一种新方法。图解 摘要各种溶剂/化学品引起的 PDMS 溶胀被记录为电阻率的变化,从而制造出基于应变的化学传感器。
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Macromolecular Research
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