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Influence of Sliding Speed and Glass Bead Concentration on 3D Roughness Parameters 滑动速度和玻璃微珠浓度对三维粗糙度参数的影响
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-01-05 DOI: 10.37358/mp.23.4.5691
L. Deleanu, Laura Maftei, G. Ojoc, Alina Ceoromila, L. C. Titire, C. Georgescu
This paper presents an analysis of 3D amplitude and functional parameters for worn surfaces of composites with polyamide 6 as matrix and different glass bead concentrations (0%, 2.5%, 5%, 10%, 20%, 30% and 50%wt). The worn surfaces after dry sliding of a steel pin on a disk, for 10 km, at constant velocity (0.5 m/s, 1 m/s and 1.5 m/s) and under an average pressure of 1 MPa. There were done two tests under the same conditions. On each worn track, there were investigated three surfaces of 500 μm x 500 μm with a contact profilometer. The number of points on the scan line was 200 points and the step between lines was 5μm. The following amplitude parameters were measured and calculated for assessed surfaces: the arithmetic mean deviation, Sa, the root mean square deviation, Sq, the maximum height of surface prominence, Sp, the maximum surface depth, Sv, the maximum height, St, the skewness factor, Ssk and the kurtosis, Sku. The discussed functional parameters are the reduced peak height, Spk, the height of the core of the surface, Sk and the depth of the valley zone, Svk. The comparison of their values makes posible to evaluate if the worn surface could function in a new running or the replacement of the component is recommended. Considering that machine components have intermittent operation, these worn surfaces becoming initial surfaces for the following cycle of contact operation. Based on the average values of amplitude and functional parameters, it was found that a relatively good surface quality is preserved for concentrations of 10...30%wt glass beads, for v=0.5...1 m/s (Sa and Sq having similar trend); for lower concentrations and for 50% glass beads, the parameter values increase but without identifying a distinct relationship with the working regime, especially for 2.5 and 5% glass beads.
本文分析了以聚酰胺 6 为基体、不同玻璃微珠浓度(0%、2.5%、5%、10%、20%、30% 和 50% 重量)的复合材料磨损表面的三维振幅和功能参数。在平均压力为 1 兆帕的条件下,钢针在圆盘上以恒定速度(0.5 米/秒、1 米/秒和 1.5 米/秒)干滑 10 千米后的磨损表面。在相同条件下进行了两次测试。在每条磨损的轨道上,用接触式轮廓仪检测了三个 500 μm x 500 μm 的表面。扫描线上的点数为 200 点,扫描线之间的间隔为 5 微米。测量和计算了评估表面的以下振幅参数:算术平均偏差 Sa、均方根偏差 Sq、表面突出的最大高度 Sp、最大表面深度 Sv、最大高度 St、偏斜系数 Ssk 和峰度 Sku。所讨论的功能参数是峰高减小值 Spk、地表核心高度 Sk 和谷区深度 Svk。通过对这些参数值的比较,可以评估磨损表面是否能在新的运行中发挥作用,或者是否建议更换部件。考虑到机器部件的间歇运行,这些磨损表面将成为下一轮接触运行的初始表面。根据振幅和功能参数的平均值发现,当玻璃珠浓度为 10...30%wt 时,在 v=0.5...1 m/s 的条件下,表面质量相对较好(Sa 和 Sq 具有相似的趋势);当玻璃珠浓度较低且为 50%时,参数值会增加,但与工作状态没有明显的关系,特别是对于 2.5%和 5%的玻璃珠。
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引用次数: 0
Removal of Aromatic Amino-derivatives from Aqueous Solutions Using Polymeric Supports Functionalized with Aminophosphonated/aminoacid-phosphonated Groups 利用氨基膦酸化/氨基酸膦酸化基团官能化的聚合物载体去除水溶液中的芳香族氨基衍生物
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-01-05 DOI: 10.37358/mp.23.4.5685
R. Ardelean, Adriana Popa, Ecaterina-Stela Dragan, C. Davidescu
Aromatic amines are the significant compounds used as intermediates in the organic synthesis, for obtaining such as azo dyes, antioxidants, fuel additives, corrosion inhibitors, pesticides, antiseptic agents, poultry medicine, and pharmaceutical synthesis. However, the presence of aromatic amines in water, even at very low concentrations, is extremely harmful to aquatic life and human health. Pollution of natural waters by aromatic amines is a serious environmental concern. The aim of this work was to obtain new adsorbents for use in the removal of aromatic amines from aqueous solutions. Styrene-15%divinylbenzene copolymers grafted with aminophosphonate groups (code: AP-S15%DVB) and amino acid-phosphonate groups (code: AM-S15%DVB) were used for the removal of pollutants such as: aniline, 2-methyl-aniline and 4-methyl-aniline. The adsorption capacity and the adsorption kinetic using the pseudo-first order and pseudo-second order equations were examined. From a kinetic point of view, it was established that the adsorption of the studied amino derivatives on the used adsorbents took place according to the pseudo-second order model. It was found that the adsorption rate constant increased with the increase of temperature, so the speed of the adsorption process increased. The obtained results confirm that the polymer adsorbents studied can be successfully used for the removal of aromatic amino derivatives from aqueous solutions for the purpose of wastewater treatment.
芳香胺是有机合成中用作中间体的重要化合物,可用于制造偶氮染料、抗氧化剂、燃料添加剂、缓蚀剂、杀虫剂、防腐剂、家禽药品和药物合成。然而,水中的芳香胺即使浓度很低,也会对水生生物和人类健康造成极大危害。芳香胺对天然水体的污染是一个严重的环境问题。这项工作的目的是获得新的吸附剂,用于去除水溶液中的芳香胺。苯乙烯-15%二乙烯基苯共聚物接枝了氨基膦酸盐基团(代码:AP-S15%DVB)和氨基酸膦酸盐基团(代码:AM-S15%DVB),用于去除苯胺、2-甲基苯胺和 4-甲基苯胺等污染物。使用伪一阶和伪二阶方程考察了吸附容量和吸附动力学。从动力学角度来看,所研究的氨基衍生物在所用吸附剂上的吸附作用是按照假二阶模型进行的。研究发现,吸附速率常数随着温度的升高而增加,因此吸附过程的速度也随之加快。所得结果证实,所研究的聚合物吸附剂可成功用于去除水溶液中的芳香族氨基衍生物,从而达到废水处理的目的。
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引用次数: 0
Mechanical Properties of PMMA and PLA Modified Epoxy Resins PMMA 和聚乳酸改性环氧树脂的机械性能
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-01-05 DOI: 10.37358/mp.23.4.5696
Ana Miroznicenco, Gabriel Saracu, V. Bria, M. Gorovei, A. Cîrciumaru
Last years research in polymers registered an increase of interest regarding polymer mixtures aiming to obtain materials with properties of the mixed polymers. In this respect many studies are pointing the mixtures between a thermoset polymer and a thermoplastic polymer. It is known the fact that thermoplastic polymers are much more malleable than the thermoset ones and the goal is to obtain a mixture with the general properties of the thermoset polymer and with a machining ability proper to the thermoset polymer. The vitrimers are this type of polymers and, some of them, can be obtained by mixing polymers form the two categories. This study is about using solutions of two thermoset polymers to modify the basic properties of three epoxy resins. The results show that the presence of PMMA, respectively, PLA inside the epoxy resin matrix determines changes of the mechanical properties of the formed materials. Without analysing the adhesive properties of new materials is hard to decide about their value from the composites applications point of view.
近年来,聚合物研究领域对聚合物混合物的兴趣日益浓厚,目的是获得具有混合聚合物特性的材料。在这方面,许多研究都针对热固性聚合物和热塑性聚合物的混合物。众所周知,热塑性聚合物的延展性比热固性聚合物要好得多,因此我们的目标是获得一种既具有热固性聚合物一般特性,又具有热固性聚合物适当加工能力的混合物。玻璃聚合物就是这类聚合物,其中一些可以通过混合这两类聚合物获得。本研究使用两种热固性聚合物的溶液来改变三种环氧树脂的基本特性。结果表明,环氧树脂基体中 PMMA 和 PLA 的存在决定了成型材料机械性能的变化。如果不对新材料的粘合性能进行分析,就很难从复合材料应用的角度确定其价值。
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引用次数: 0
Effect of Phenolic Resin Coating Thickness on Mechanical Properties and Corrosion Resistance of Metal Materials 酚醛树脂涂层厚度对金属材料机械性能和耐腐蚀性的影响
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-01-05 DOI: 10.37358/mp.23.4.5684
Diyao Zhang, L. Yuan, Jingkun Yu
In the realm of petrochemical and other industries, metal materials face threats such as impact and high-temperature electrochemical corrosion. Consequently, there has been significant attention towards organic coatings that effectively attenuate impact forces while simultaneously providing a barrier against corrosive agents. The thermosetting phenolic resin 2130, known for the facile curing process, exceptional thermal stability, water resistance, corrosion resistance, and superior mechanical properties post-curing, finds extensive applications in the field of coatings. To address the challenge of depositing a complete and uniform resin coating on complex workpieces, coatings with varying thicknesses on the surface of 304 stainless steel were deposited via rotary evaporation combined with long-term low-temperature drying. The relationship between coating thickness and mechanical properties, as well as corrosion resistance, was investigated and analyzed through a comprehensive approach involving mechanical testing, electrochemical analysis, and long-term service weight loss assessment. The results demonstrated that the coatings deposited on the metal surface exhibited excellent integrity and compactness. Moreover, an increase in coating thickness led to a significant reduction in material corrosion rate. The coatings exhibited excellent substrate adhesion and flexibility, thereby providing effective protection against impact on the metal substrate. The relationship between the thickness of the coating and the surface roughness was evident, while the flexibility of the coating first increased and then decreased with the increase of coating thickness. When the coating thickness was 7 μm, the maximum surface roughness of the coating measured 0.44 μm. Under these conditions, the impact toughness of the coating reached the peak, exhibiting a ductile fracture mode and showcasing superior comprehensive mechanical properties. The findings of this study will offer theoretical support for the investigation and formulation of resin coatings in subsequent industrial production.
在石化和其他工业领域,金属材料面临着冲击和高温电化学腐蚀等威胁。因此,既能有效减弱冲击力,又能阻挡腐蚀介质的有机涂层备受关注。热固性酚醛树脂 2130 以其简便的固化过程、优异的热稳定性、耐水性、耐腐蚀性和固化后的优异机械性能而著称,在涂料领域有着广泛的应用。为了解决在复杂工件上沉积完整均匀的树脂涂层这一难题,我们通过旋转蒸发结合长期低温干燥的方法在 304 不锈钢表面沉积了不同厚度的涂层。通过机械测试、电化学分析和长期使用失重评估等综合方法,研究和分析了涂层厚度与机械性能和耐腐蚀性之间的关系。结果表明,沉积在金属表面的涂层具有良好的完整性和致密性。此外,涂层厚度的增加会显著降低材料的腐蚀率。涂层具有极佳的基体附着力和柔韧性,因此能有效防止金属基体受到冲击。涂层厚度与表面粗糙度之间的关系非常明显,而涂层的柔韧性则随着涂层厚度的增加而先增大后减小。当涂层厚度为 7 μm 时,涂层的最大表面粗糙度为 0.44 μm。在这些条件下,涂层的冲击韧性达到峰值,呈现出韧性断裂模式,显示出卓越的综合机械性能。本研究的结果将为后续工业生产中树脂涂层的研究和配方提供理论支持。
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引用次数: 0
Finite Element Modeling of the Thermomechanical Behavior of Polyethylene 聚乙烯热力学行为的有限元建模
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-01-05 DOI: 10.37358/mp.23.4.5686
Sana Ben Khlifa, Ltaief Lammari, Wajdi Chtourou, H. Kharroubi
This article presents a finite element study based on tests of characterizations to find the properties of the materials studied, the injection-blowing technique, chosen in this case, is characterized by the bi-axial of the material, and one benefits from the orientation of the macromolecules in the directions of use of the material. The objective of this work is to link all the mechanical and thermal parameters during the treatment of molten polymer materials subjected to high-stress rates that can lead to significant temperature increases due to viscous heating in the order of 200�C. Predicting the temperature range is essential for good temperature control and is a major factor in determining the quality of the final product. This forces us to choose an adequate law of behavior, capable of translating the mechanical evolution under the thermal effect while explaining the rheological response of the viscoelastic metal. So this process is usually accompanied by geometric defects resulting from the original residual stresses cooling speed and the process itself. In the packaging of food products, as in this case, the bottles require to have a stable filling and a certain storage capacity.
本文介绍了一项基于特性测试的有限元研究,以了解所研究材料的特性。在本案例中,所选择的注射吹塑技术的特点是材料的双轴性,并且可以从材料使用方向上的大分子取向中获益。这项工作的目的是在对熔融聚合物材料进行高应力速率处理时,将所有机械参数和热参数联系起来。预测温度范围对于良好的温度控制至关重要,也是决定最终产品质量的重要因素。这就迫使我们选择一种适当的行为法则,既能解释热效应下的机械演变,又能解释粘弹性金属的流变反应。因此,在这一过程中,通常会出现因原始残余应力冷却速度和工艺本身造成的几何缺陷。在食品包装中,瓶子需要有稳定的灌装和一定的储存能力。
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引用次数: 0
PLGA - gallic Acid Advanced Drug Delivery System as New Functional Material 作为新型功能材料的聚乳酸-没食子酸高级给药系统
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-01-05 DOI: 10.37358/mp.23.4.5688
Anne-Marie Beatrice Poenariu, Roberto Angelo Postelnicu, M. Ciocîlteu, Gabriela Rau, Mariana Popescu, A. Simionescu, Ionela Andreea Neacsu, C. Nicolicescu, D. Amzoiu
Combining polimers with polyphenols such as gallic acid opens up new directions in healthcare system. By encapsulating secondary metabollites within PLGA nanoparticles, we tried to enhance their stability, solubility, and obtain a targeted delivery system. In this study, we synthesized a PLGA-gallic acid sustained release system, using the solvent evaporation method. This approach improved the therapeutic efficacy of gallic acid. The numerical distribution showed that most PLGA-GA nanoparticles have a size of 10 nm. Through the method of solvent evaporation, an incorporation efficiency of 49% was obtained.
将多聚物与没食子酸等多酚类物质相结合为医疗保健系统开辟了新方向。通过在聚乳酸(PLGA)纳米颗粒中封装次生代谢产物,我们试图提高它们的稳定性和可溶性,并获得一种靶向给药系统。在这项研究中,我们采用溶剂蒸发法合成了聚乳酸-胆酸缓释系统。这种方法提高了没食子酸的疗效。数值分布显示,大多数 PLGA-GA 纳米粒子的尺寸为 10 nm。通过溶剂蒸发法,获得了 49% 的掺入效率。
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引用次数: 0
Virtual Preparations Versus Classic Preparations on Resin Models in Prosthodontics 修复学中树脂模型的虚拟制备与传统制备的比较
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-01-05 DOI: 10.37358/mp.23.4.5692
Simona andreea Sandu
Virtual reality technologies are important auxiliary tools in the process of learning and acquiring the manual skills necessary for clinical maneuvers in dental prosthodontics. This study shows the particularities in the use of the virtual simulation system designed for dental prosthodontics, compared to the classically preparations performed on resin models. The interactively simulation systems reproduce real clinical situations in which students practice specific dental prosthetics maneuvers. Resin models do not reproduce the accuracy of the dental structures at the time of the preparation. The advantages of using virtual technology are efficient clinical training, allowing for repeatability, self-assessment of procedures and the acquisition of manual skills. In this way, the advantages conferred by virtual simulators are superior to those resulting from the use of resin models in the acquirement of manual skills.
虚拟现实技术是学习和掌握口腔修复学临床操作技能的重要辅助工具。这项研究表明,与在树脂模型上进行的传统准备工作相比,牙科修复学虚拟仿真系统的使用具有特殊性。交互式模拟系统再现了真实的临床情况,学生可以在其中练习特定的牙科修复操作。树脂模型无法再现牙科结构在预备时的准确性。使用虚拟技术的优势在于高效的临床培训、可重复性、程序的自我评估以及手工技能的掌握。因此,在掌握手工技能方面,虚拟模拟器的优势要优于使用树脂模型。
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引用次数: 0
Piezoelectric thin Film Composites with BaTiO3 for Microelectronics 用于微电子学的 BaTiO3 压电薄膜复合材料
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-01-05 DOI: 10.37358/mp.23.4.5683
Mihaela Aradoaei, A. Lucaci, R. Ciobanu, Cristina-Mihaela Schreiner, Bogdan-George Rusu, G. Hitruc, Magdalena Aflori, Marius Paulet, A. Caramitu, A. Borş
The piezocomposites from poly-(vinylidene fluoride) (PVDF) with BaTiO3 (BT) are largely presented in literature, but the composites from polydimethylsiloxane (PDMS) with BT consist a very new scientific preoccupation. The novelty of the paper lies in a new simpler route of preparation of the two composites with PDMS and respectively PVDF matrix, with tailored deposition on specific substrates for microelectronic use (e.g. indium-tin-oxide ITO/glass, Si/Pt, polyethylene terephthalate PET), along with an extensive comparation of their dielectric features, a consistent comparison of the influence of polymer matrix upon the piezoelectric features, and a demonstration of direct use for microelectronic applications of the composites of BT with PDMS. An interesting effect is observed around 100 kHz domain, determined by the activity and architecture of BT particles mainly for the BT-PDMS composites, which induce an additional ionic-dipolar conjugated polarization, as a displacement due to the balance between the resonance and anti-resonance frequency. Such phenomena explain the potential use of such composites as resonators/filters, and BT-PDMS composites should be further investigated for tailored applications in radiofrequency electronic field. We can appreciate that superior piezoelectric features are offered by the composites of BT with PDMS, comparing to the composites with PVDF, which means that the composites of BT with PDMS were worth to study, leading to more versatile variants of electronic characteristics and with superior values.
聚偏二氟乙烯(PVDF)与钡钛氧化物(BT)的压电复合材料在文献中已有大量介绍,但聚二甲基硅氧烷(PDMS)与钡钛氧化物的复合材料还是一个非常新的科学课题。本文的新颖之处在于采用了一种新的更简单的方法制备这两种分别以 PDMS 和 PVDF 为基体的复合材料,并在微电子用途的特定基底(如氧化铟锡 ITO/玻璃、硅/铂、聚对苯二甲酸乙二醇酯 PET)上进行了定制沉积,同时对它们的介电特性进行了广泛的比较,对聚合物基体对压电特性的影响进行了一致的比较,并展示了 BT 与 PDMS 复合材料在微电子应用中的直接用途。在 BT-PDMS 复合材料中,主要由 BT 颗粒的活性和结构决定,在 100 kHz 域附近观察到一种有趣的效应,这种效应会诱发额外的离子-两极共轭极化,由于共振频率和反共振频率之间的平衡而产生位移。这些现象解释了此类复合材料作为谐振器/滤波器的潜在用途,因此应进一步研究 BT-PDMS 复合材料在射频电子领域的定制应用。我们可以发现,与使用 PVDF 的复合材料相比,使用 BT 和 PDMS 的复合材料具有更优越的压电特性,这意味着使用 BT 和 PDMS 的复合材料值得研究,它将带来更多的电子特性变体,并具有更高的价值。
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引用次数: 0
In vitro Study on Water Absorption of Dental Restorative Materials 牙科修复材料吸水性体外研究
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-01-05 DOI: 10.37358/mp.23.4.5693
L. Todor, Razvan Fluieras, Dan Florin Bonta, I. Olariu, I. Lile, Otilia Lavinia Stana, R. Popovici, Sergiu Andrei Todor, Daniela Domocos, Ana Maria Matichescu
Among the properties of materials for direct coronal restorations, water absorption is particularly important, influencing the mechanical properties, color and adhesion of the restorations made.The aim of this study was to compare the water absorption of six dental restorative materials, two composite, two compomers and two glass ionomers. Water absorption was determined on disk samples. 30 discs were prepared, 5 of each studied material, with a diameter of 15 mm and a thickness of 1 mm. The water absorption test was carried out based on the ISO 4049 specification. The composites and compomers showed a water absorption within the standard limits (40 �g/mm3). Glass ionomers show high water absorption, therefore to be used as coronal restorative materials they need to be coated with a protective varnish.
本研究的目的是比较六种牙科修复材料(两种复合材料、两种合成材料和两种玻璃离聚体)的吸水性。吸水性是在圆盘样品上测定的。制备了 30 个圆盘,每种材料 5 个,直径 15 毫米,厚度 1 毫米。吸水性测试根据 ISO 4049 标准进行。复合材料和复合材料的吸水性均在标准范围内(40 � 克/立方毫米)。玻璃离聚体的吸水性较高,因此要用作冠状修复材料,必须涂上一层保护漆。
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引用次数: 0
Mechanical Properties, DMA and Structural Analysis of Cassia Auriculata/PLA Blended Hybrid bio Matrix Composite 决明子/聚乳酸混合生物基复合材料的力学性能、DMA 和结构分析
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-01-05 DOI: 10.37358/mp.23.4.5689
Sengalani Perumal Srinivasan, Raghavendran Giri, Vajjiram Santhanam, Paulraj Prabhu
In this study, hybrid composite material composed of Poly Lactic Acid (PLA) and Cassia Auriculata (CA) were fabricated and the mechanical properties were evaluated to assess the impact of bio filler loading in the bio polymer (PLA) matrix. In order to fabricate the composite specimens, the CA bio filler was added to the PLA matrix in proportions of 10%, 20%, 30%, 40% and 50% by volume. In line with ASTM specifications, experiments were conducted to establish how the hybrid bio matrix, which was composed of both PLA and CA influenced the composite s mechanical characteristics. The test results indicated that adding 30 percent CA to PLA enhanced the material s mechanical, dynamic mechanical analysis, thermogravimetric properties. The composite composition with better properties was considered for further fabrication of a colposcopy fixture, the component was fabricated using additive manufacturing methodology.
本研究制作了由聚乳酸(PLA)和决明子(CA)组成的混合复合材料,并对其机械性能进行了评估,以评估生物填料在生物聚合物(PLA)基体中的添加量对其性能的影响。为了制作复合材料试样,在聚乳酸基体中按体积比 10%、20%、30%、40% 和 50%的比例添加了 CA 生物填料。根据美国材料与试验协会(ASTM)的规范,我们进行了实验,以确定由聚乳酸和 CA 组成的混合生物基质如何影响复合材料的机械特性。测试结果表明,在聚乳酸中添加 30% 的 CA 可提高材料的机械、动态力学分析和热重特性。性能更佳的复合材料被考虑用于进一步制造阴道镜夹具,该部件采用添加制造方法制造。
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引用次数: 0
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