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A comparative study of the physiochemical and biological properties of tetracycline-loaded polypropylene sutures prepared through different plasma treatments 通过不同等离子处理制备的四环素负载聚丙烯缝合线的理化和生物特性比较研究
IF 3.1 3区 化学 Q3 POLYMER SCIENCE Pub Date : 2024-07-02 DOI: 10.1007/s13726-024-01353-2
Nader kasiri, Marziyeh Mousazadeh, Faezeh Mousazadeh, Maryam Nikkhah, Hamid Keshvari

In this work, a comparative investigation was done on the physiochemical and biological properties of tetracycline-loaded polypropylene sutures prepared through nitrogen, oxygen, and/or argon plasma treatment/grafting method. Two types of multi- and monofilament polypropylene sutures were treated by various plasma gases followed by acrylonitrile and acrylic acid grafting. Nitrogen and oxygen plasmas compared to argon plasma showed higher efficiencies in functionalization and wettability of the filaments. Tetracycline hydrochloride loading on the plasma-treated/grafted filaments was done through immersion method. The prepared filaments were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and attenuated total reflection–Fourier transform infrared spectroscopy (ATR-FTIR) and their mechanical properties were determined, accordingly. The antibacterial effect of tetracycline hydrochloride was studied over two different Gram-positive and Gram-negative bacteria. No cytotoxicity was observed for these filaments on the L929 fibroblast cell line using MTT assay. The release profile of the tetracycline hydrochloride-loaded sutures reached the stationary phase in 25 h. Nitrogen plasma-treated sutures showed the highest drug release profile among the others. The current work showed the effects of different plasma treatments on the biological, mechanical, and chemical properties of the tetracycline-loaded polypropylene sutures. The nitrogen plasma was superior to oxygen plasma in the opinion of grafting rate, mechanical properties, and antibacterial activities.

Graphical abstract

在这项工作中,对通过氮气、氧气和/或氩气等离子处理/接枝法制备的负载四环素的聚丙烯缝合线的理化和生物特性进行了比较研究。对两种多丝和单丝聚丙烯缝合线进行了各种等离子气体处理,然后进行丙烯腈和丙烯酸接枝。与氩气等离子体相比,氮气和氧气等离子体在功能化和丝的润湿性方面表现出更高的效率。盐酸四环素通过浸泡法加载到等离子体处理/接枝的长丝上。通过扫描电子显微镜(SEM)、X 射线衍射(XRD)和衰减全反射-傅立叶变换红外光谱(ATR-FTIR)对制备的长丝进行了表征,并相应地测定了它们的机械性能。研究了盐酸四环素对两种不同革兰氏阳性和革兰氏阴性细菌的抗菌效果。用 MTT 法检测了这些细丝对 L929 成纤维细胞系的细胞毒性。盐酸四环素载体缝合线的释放曲线在 25 小时内达到静止阶段,氮等离子处理的缝合线显示出最高的药物释放曲线。目前的研究显示了不同等离子体处理对盐酸四环素聚丙烯缝合线生物、机械和化学特性的影响。氮等离子体在接枝率、机械性能和抗菌活性方面均优于氧等离子体。 图表摘要
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引用次数: 0
Synergistic effect of a new binary accelerator system on curing characteristics and properties of styrene–butadiene rubber vulcanizates 新型二元促进剂体系对丁苯橡胶硫化胶硫化特性和性能的协同效应
IF 3.1 3区 化学 Q3 POLYMER SCIENCE Pub Date : 2024-07-02 DOI: 10.1007/s13726-024-01344-3
Fahima M. Helaly, Adel A. Koriem, Samaa R. Salem, Sanaa M. El-Sawy, Fikry A. Abdel-Mohdy, Aman I. Khalaf

Enhancing the vulcanization rate of elastomers is a common objective for optimizing their performance. Styrene–butadiene rubber (SBR) was vulcanized employing several conventional systems designed with various amounts of sulfur and activators/accelerators. Herein, it was an attempt to synthesize a copolymer from glycidyl methacrylate (GMA) and diethylaminoethyl methacrylate (DEAEMA)-(GMA-co-DEAEMA) and study its effect as a secondary accelerator on the curing characteristics and vulcanizate properties of SBR. The copolymer GMA-co-DEAEMA (III) was grafted with three different functional groups (R) including thioglycolic acid, 2-aminothiophenol, and 2-amino-5-mercaptothiazole, to yield III/S/1, IIII/S/2, and III/S/3 copolymers, respectively. The three-modified copolymers with an added conventional accelerator N-cyclohexyl-2-benzothiazole sulfenamide (CBS) were used to accelerate the efficiency of the vulcanizing agent (sulfur). Additional characterization of the synthesized copolymer and the obtained cured elastomer were carried out through different techniques, including mass and Fourier-transform infrared spectroscopy and thermogravimetric analysis (TGA), in addition to the rheological and mechanical studies. The results revealed that all the subject copolymers, when applied as a secondary accelerator for the SBR vulcanization reaction, enhanced the rate and the state of the cross-linking process. The findings of this study eruditely recommended that large rubber articles, like tires, could be cured more efficiently and cost-effectively when employing the presented copolymer as a secondary accelerator.

Graphical abstract

提高弹性体的硫化速度是优化其性能的一个共同目标。丁苯橡胶(SBR)的硫化采用了几种传统体系,这些体系设计了不同数量的硫和活化剂/促进剂。本文尝试合成一种甲基丙烯酸缩水甘油酯(GMA)和甲基丙烯酸二乙氨基乙酯(DEAEMA)的共聚物(GMA-co-DEAEMA),并研究其作为辅助促进剂对丁苯橡胶硫化特性和硫化性能的影响。共聚物 GMA-co-DEAEMA (III) 接枝了三种不同的官能团 (R),包括硫代乙醇酸、2-氨基苯硫酚和 2-氨基-5-巯基噻唑,分别得到 III/S/1、III/S/2 和 III/S/3 共聚物。添加了传统促进剂 N-环己基-2-苯并噻唑亚磺酰胺(CBS)的三种改性共聚物可用于提高硫化剂(硫)的效率。除了流变学和力学研究外,还通过不同的技术对合成的共聚物和获得的固化弹性体进行了表征,包括质谱和傅立叶变换红外光谱以及热重分析(TGA)。研究结果表明,所有受试共聚物在用作 SBR 硫化反应的二级促进剂时,都能提高交联过程的速率和状态。这项研究的结果建议,在使用所介绍的共聚物作为辅助促进剂时,可以更高效、更经济地硫化大型橡胶制品(如轮胎)。
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引用次数: 0
Polylactide/polyvinyl acetate blends containing different molecular weights of poly(ethylene glycol) 含有不同分子量聚乙二醇的聚乳酸/聚醋酸乙烯酯混合物
IF 3.1 3区 化学 Q3 POLYMER SCIENCE Pub Date : 2024-06-24 DOI: 10.1007/s13726-024-01350-5
Wenxi Cheng, Yuanhang Cao, Wei Miao, Yongjian Zhang, Li Tian, Haowei Lin, Weiqiang Song, Yike Zhang, Tao Wang

Polylactide (PLA)/polyvinyl acetate (PVAc)/poly(ethylene glycol) (PEG) blends with different molecular weights of PEG (4000, 10000, and 20000 g/mol) were prepared, and the weight ratio was fixed at 72/18/10 (g/g/g) after the tensile analysis of PLA/PVAc and PLA/PEG blends, and finally the samples were characterized by various methods. The tensile and impact results showed that all the ternary blends were well toughened by PEG, and with the increase of PEG molecular weight, the tensile strength and impact strength increased. Scanning electron microscopy and energy-dispersive X-ray spectroscopy results indicated that 20% (by weight) of PVAc exceeded its solubility limit with PLA, and therefore the excess PVAc was dispersed as nanoparticles in the matrix. When PEG was added, the insoluble amount of PVAc decreased, indicating that the miscibility between PLA and PVAc could be increased by PEG. Differential Scanning Calorimetry results showed that Tm optical microscopy results showed that the number and size of PLA spherulites was peak areas of PLA in PLA/PVAc/PEG blends were smaller than that in PLA/PVAc blend, showing that the crystallinity of PLA was decreased with the addition of PEG in the presence of PVAc, which was confirmed by X-ray diffraction results. Polarization was the smallest in PLA/PVAc/PEG blends. All the ternary blends were transparent and had better visible light transmissions than PLA/PVAc blend. Thermal gravimetric analysis results showed that PLA and its blends had similar thermal stability. Overall, a low-cost PLA-modified material that combined high toughness, strength, and transparency without the need for customization was provided.

Graphical Abstract

制备了不同 PEG 分子量(4000、10000 和 20000 g/mol)的聚乳酸(PLA)/聚醋酸乙烯酯(PVAc)/聚乙二醇(PEG)共混物,在对聚乳酸/PVAc 和聚乳酸/PEG 共混物进行拉伸分析后,确定重量比为 72/18/10(g/g/g),最后通过各种方法对样品进行了表征。拉伸和冲击结果表明,所有三元共混物都得到了 PEG 的良好增韧,并且随着 PEG 分子量的增加,拉伸强度和冲击强度都有所提高。扫描电子显微镜和能量色散 X 射线光谱分析结果表明,20% 的 PVAc(按重量计)超过了其与聚乳酸的溶解极限,因此多余的 PVAc 以纳米颗粒的形式分散在基体中。加入 PEG 后,PVAc 的不溶量减少,这表明 PEG 可以增加聚乳酸与 PVAc 的混溶性。差示扫描量热法结果表明,Tm 光学显微镜结果表明,PLA/PVAc/PEG 共混物中聚乳酸球形颗粒的数量和尺寸、峰面积均小于 PLA/PVAc 共混物,表明在 PVAc 存在下,随着 PEG 的加入,聚乳酸的结晶度降低,X 射线衍射结果也证实了这一点。极化在 PLA/PVAc/PEG 共混物中最小。所有三元共混物都是透明的,其可见光透过率均优于聚乳酸/PVAc 共混物。热重分析结果表明,聚乳酸及其混合物具有相似的热稳定性。总之,这种低成本的聚乳酸改性材料集高韧性、高强度和高透明度于一身,而且无需定制。
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引用次数: 0
Ultra-fast setting rate of a new bioactive binder for bone repair 用于骨修复的新型生物活性粘合剂的超快凝固率
IF 3.1 3区 化学 Q3 POLYMER SCIENCE Pub Date : 2024-06-23 DOI: 10.1007/s13726-024-01354-1
Ning Gu, Qingxiao Liu, Qichao Liu, Ying Ren, Xiaodong Liu, Youyi Sun, Yang Cao

Polymer bone binder has attracted lots of attention due to its facile preparation, biodegradability, and so on. However, achieving strong adhesion, easy preparation, and fast setting rate for polymer bone binding is still a great challenge. So, here, a new polymer bone binder is developed and prepared to simultaneously improve setting rate and strength. The bone binder is composed of polyethyleneglycol, ethylhydroacrylate, chitosan, and SiO2 nanoparticles. It exhibits good biocompatibility and large bonding strength (ca. 2.0 MPa). Furthermore, the bone binder shows an ultra-fast setting rate (ca. 100 s), which is far faster than that reported in previous works. The bone binder is further evaluated to bond chicken bone, which exhibits a high binding force of 2.0 kgf in a short setting time of only 5.0 min. The good biocompatibility and the large bonding strength of the present bone binder are attributed to the green and environmentally friendly composition (e.g., cyanoacrylate, chitosan, polyethyleneglycol and SiO2 nanoparticles) and cross-linking network between chitosan and SiO2 nanoparticles. The ultra-fast setting process is attributed to the rapid polymerization of cyanoacrylate and the physical interaction of SiO2 nanoparticles with chitosan and polyethyleneglycol. The work provides a new method to design and prepare high-performance bone binders for use in bone fracture repair.

Graphical abstract

聚合物骨粘合剂因其制备简便、可生物降解等优点而备受关注。然而,如何实现聚合物骨粘合剂的强粘合性、易制备性和快速凝固率仍然是一个巨大的挑战。因此,本文开发并制备了一种新型聚合物骨粘合剂,以同时提高固化率和强度。该骨粘合剂由聚乙二醇、氢丙烯酸乙酯、壳聚糖和纳米二氧化硅组成。它具有良好的生物相容性和较大的粘合强度(约 2.0 兆帕)。此外,这种骨粘合剂还具有超快的凝固速度(约 100 秒),远远快于之前的研究成果。我们进一步评估了骨粘合剂粘合鸡骨的效果,其粘合力高达 2.0 kgf,而固化时间仅为 5.0 分钟。本骨粘合剂具有良好的生物相容性和较大的粘合力,这归功于其绿色环保的成分(如氰基丙烯酸酯、壳聚糖、聚乙二醇和二氧化硅纳米粒子)以及壳聚糖和二氧化硅纳米粒子之间的交联网络。超快固化过程归功于氰基丙烯酸酯的快速聚合以及二氧化硅纳米粒子与壳聚糖和聚乙二醇的物理相互作用。这项研究为设计和制备用于骨折修复的高性能骨粘合剂提供了一种新方法。
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引用次数: 0
Synergistic effect of graphene and carbon black on the mechanical and vibration damping characteristics of styrene-butadiene rubber 石墨烯和炭黑对丁苯橡胶机械和减振特性的协同效应
IF 3.1 3区 化学 Q3 POLYMER SCIENCE Pub Date : 2024-06-21 DOI: 10.1007/s13726-024-01349-y
Sivakumar Chandramohan, Muralidharan Vaithiyanathan, Bikash Chandra Chakraborty, Murali Manohar Dharmaraj

This work experimentally introduces a novel approach to vibration damping materials in industrial applications, investigating the synergistic effect of graphene nanoplates (GNP) and carbon black (CB) within styrene-butadiene rubber (SBR) to enhance both mechanical properties and vibration damping characteristics. The SBR hybrid nanocomposite containing a fixed amount of CB (20 phr) and a variable amount of GNP (2, 5, 7.5, and 10 phr) was prepared to compare with a neat SBR and 20 phr CB/SBR composite. The hybrid nanocomposites underwent assessment for morphology, tensile strength, tear strength, hardness, and vibration damping characteristics utilizing constrained layer damping (CLD). The results indicated that, in comparison to non-hybrid composites, the addition of GNP to the SBR matrix substantially improved the tensile strength by 64%, modulus by 28%, stiffness by 28%, and tear strength by 31.3%. Experimental modal analysis was used to determine the vibration characteristics. The system loss factor of the CLD exhibited a notable increase of 105% and 44% in the first and second modes, respectively, with the incorporation of 10 phr graphene in the hybridized composite, as compared to the composite containing only carbon black. The experimental damping loss factor was compared with theoretical model values proposed in one available mathematical model revealing a better agreement overall, though an exception was noted in the first mode. This paper can serve as a foundation for fabricating constrained layer damping (CLD) structures using hybrid fillers, resulting in high materials loss factors suitable for low-frequency applications.

Graphical abstract

本研究通过实验介绍了一种新型减振材料在工业应用中的应用,研究了石墨烯纳米板(GNP)和炭黑(CB)在丁苯橡胶(SBR)中的协同作用,以提高机械性能和减振特性。制备了含有固定量 CB(20 phr)和不同量 GNP(2、5、7.5 和 10 phr)的 SBR 混合纳米复合材料,并与纯 SBR 和 20 phr CB/SBR 复合材料进行了比较。对混合纳米复合材料的形态、拉伸强度、撕裂强度、硬度以及利用约束层阻尼(CLD)的减振特性进行了评估。结果表明,与非混合复合材料相比,在丁苯橡胶基体中添加 GNP 可大幅提高拉伸强度 64%、模量 28%、硬度 28%、撕裂强度 31.3%。实验模态分析用于确定振动特性。与仅含炭黑的复合材料相比,在杂化复合材料中加入 10 短片石墨烯后,CLD 的第一和第二模态系统损耗因子分别显著增加了 105% 和 44%。将实验阻尼损失因子与一个现有数学模型中提出的理论模型值进行比较后发现,虽然在第一种模式中存在例外情况,但总体上两者的一致性较好。本文可作为使用混合填料制造约束层阻尼(CLD)结构的基础,从而获得适合低频应用的高材料损耗因子。
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引用次数: 0
The degradation of poly(1-butene) extrudates subjected to artificial and natural aging 经人工老化和自然老化的聚(1-丁烯)挤出物的降解情况
IF 3.1 3区 化学 Q3 POLYMER SCIENCE Pub Date : 2024-06-20 DOI: 10.1007/s13726-024-01348-z
Sona Zenzingerova, Michal Kudlacek, Lubomir Benicek, David Jaska, Jana Navratilova, Lenka Gajzlerova, Roman Cermak

In this work, we examined the degradation behavior of isotactic poly(1-butene) (PB-1) under artificial aging and natural weathering conditions. PB-1 samples underwent accelerated aging through UV irradiation and natural weathering. Chemical and structural changes in the degraded samples were characterized using Fourier-transform infrared–attenuated total reflectance (FTIR–ATR) spectroscopy, surface analysis, and wide-angle X-ray scattering (WAXS). The mechanical properties were evaluated via tensile testing. FTIR–ATR analysis revealed the presence of carbonyl groups in the degraded samples, indicating oxidative degradation. Surface observations employing scanning electron microscopy (SEM) revealed the formation of surface cracks in both samples, with differing crack initiation mechanisms. The two aging methods affected the mechanical properties of the samples: artificial aging induced a gradual reduction in both tensile modulus and strength, whereas natural weathering engendered a marginal increment in modulus alongside diminished strength. Additionally, elongation-at-break value witnessed a marked decrease in both sample sets during the preliminary stages of degradation. This work employed accelerated time equivalent, obtained by juxtaposition of the values of carbonyl index during both artificial aging and natural weathering and their interpolation to determine the degradation rate and adequately to correlate the final properties of the aged PB-1. It was observed that surface morphology and mechanical attributes of degraded samples were subject to additional influences such as temperature, humidity, and precipitation during natural weathering. This research work provided significant insights into PB-1 degradation mechanisms and effect of different aging conditions on its performance.

Graphical abstract

在这项工作中,我们研究了人工老化和自然风化条件下异方性聚 (1-butene) (PB-1) 的降解行为。通过紫外线照射和自然风化,PB-1 样品经历了加速老化。使用傅立叶变换红外-衰减全反射(FTIR-ATR)光谱、表面分析和广角 X 射线散射(WAXS)对降解样品的化学和结构变化进行了表征。机械性能通过拉伸测试进行评估。傅立叶变换红外-ATR 分析表明,降解样品中存在羰基,这表明样品发生了氧化降解。利用扫描电子显微镜(SEM)进行的表面观察显示,两种样品都形成了表面裂纹,裂纹的形成机制各不相同。两种老化方法都会影响样品的机械性能:人工老化会导致拉伸模量和强度逐渐降低,而自然风化则会导致模量略有增加,但强度降低。此外,在降解的初级阶段,两组样品的断裂伸长率值都明显下降。这项研究采用了加速时间当量,通过并列人工老化和自然风化过程中的羰基指数值及其内插法来确定降解速率,并充分关联老化 PB-1 的最终特性。据观察,降解样品的表面形态和机械属性受到自然风化过程中温度、湿度和降水等其他因素的影响。这项研究工作为了解 PB-1 降解机理和不同老化条件对其性能的影响提供了重要依据。
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引用次数: 0
A comparative study on the impact performance of water-exposed balsa-cored sandwich structures 露水轻木芯夹层结构冲击性能比较研究
IF 3.1 3区 化学 Q3 POLYMER SCIENCE Pub Date : 2024-06-15 DOI: 10.1007/s13726-024-01346-1
Moslem Najafi, Jafar Eskandari Jam, Reza Ansari
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引用次数: 0
Synergistic effect between ammonium polyphosphate-functionalized poly(lactic acid) and phosphated avocado seed on the flame-retardant properties of poly(lactic acid)/ethylene–vinyl acetate copolymer composites 聚磷酸铵功能化聚(乳酸)和磷化鳄梨籽对聚(乳酸)/乙烯-醋酸乙烯共聚物复合材料阻燃性能的协同效应
IF 3.1 3区 化学 Q3 POLYMER SCIENCE Pub Date : 2024-06-14 DOI: 10.1007/s13726-024-01345-2
J. D. Zuluaga‐Parra, Luis Francisco Ramos-de Valle, Saúl Sánchez-Valdéz, Rachel Faverzani-Magnago, Adriano da Silva, Luciano da Silva
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引用次数: 0
Development of polysulfone membranes and their application for removing rare earth ions from aqueous solutions by polyvinyl alcohol-enhanced ultrafiltration 聚砜膜的开发及其在通过聚乙烯醇增强超滤去除水溶液中稀土离子中的应用
IF 3.1 3区 化学 Q3 POLYMER SCIENCE Pub Date : 2024-06-13 DOI: 10.1007/s13726-024-01325-6
Nourhen Ben Kraiem, Asma Rhimi, Khira Zlaoui, K. Horchani-Naifer, A. Hafiane, Dorra Jellouli Ennigrou
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引用次数: 0
Green based composite polyurethane coatings for steel 用于钢材的绿色复合聚氨酯涂料
IF 3.1 3区 化学 Q3 POLYMER SCIENCE Pub Date : 2024-06-08 DOI: 10.1007/s13726-024-01341-6
Dmitry S. Konovalov, Natalia N. Saprykina, V. Zuev
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引用次数: 0
期刊
Iranian Polymer Journal
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