International Journal of Polymer Analysis and Characterization最新文献

Synthesis, rheological and thermal studies of Gum ghatti-cl-poly(acrylic acid) hydrogels containing CoFe2O4 nanoparticles 含 CoFe2O4 纳米颗粒的 Gum ghatti-cl-poly(acrylic acid) 水凝胶的合成、流变学和热学研究

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-24 DOI: 10.1080/1023666X.2024.2410746

Pragnesh N. Dave , Pradip M. Macwan , Bhagvan Kamaliya

In this work, Gum ghatti-cl-poly(acrylic acid)/CoFe₂O₄ (GGAACF) hydrogels were synthesized using a free radical polymerization technique, with CoFe₂O₄ nanoparticles incorporated via a co-precipitation method using nitrates as precursors. Thermal gravimetric analysis (TGA) revealed that the inclusion of CoFe₂O₄ nanoparticles enhanced the thermal stability of the hydrogels. Swelling studies indicated that the addition of 30 mg of CoFe₂O₄ nanoparticles maximized water retention. Rheological assessments demonstrated non-Newtonian behavior, with flow curves fitted best by the Power Law model. The incorporation of CoFe₂O₄ nanoparticles significantly improved the hydrogel’s elasticity and viscosity, as evidenced by a higher storage modulus (G′) compared to the loss modulus (G″) across all frequencies, indicating the elastic nature of the hydrogels. The decrease in complex viscosity with increasing frequency confirmed the pseudoplastic properties of the hydrogels, attributed to the random alignment of CoFe₂O₄ nanoparticles within the matrix. Tan δ values were below unity at all tested frequencies, underscoring the hydrogels’ strong elastic properties. These findings highlight the effectiveness of rheological analysis in characterizing the viscoelastic behavior of polymer hydrogels, which can be tailored for various applications.

本研究采用自由基聚合技术合成了 Ghatti-cl-poly(acrylic acid)/CoFe2O4 水凝胶（GGAACF），并以硝酸盐为前驱体，通过共沉淀法加入了 CoFe2O4 纳米粒子。热重分析（TGA）显示，CoFe2O4 纳米粒子的加入增强了水凝胶的热稳定性。膨胀研究表明，添加 30 毫克 CoFe2O4 纳米粒子可最大限度地保持水分。流变学评估显示了非牛顿流体行为，流动曲线与幂律模型的拟合效果最佳。掺入 CoFe2O4 纳米粒子后，水凝胶的弹性和粘度明显提高，这表现在所有频率下的储存模量（G′）都高于损失模量（G″），表明水凝胶具有弹性。复合粘度随频率增加而降低，证实了水凝胶的假塑性特性，这归因于 CoFe2O4 纳米粒子在基质中的随机排列。在所有测试频率下，Tan δ 值都低于统一值，突出了水凝胶的强弹性特性。这些发现凸显了流变分析在表征聚合物水凝胶粘弹性行为方面的有效性，聚合物水凝胶可为各种应用量身定制。

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引用次数: 0

Preparation and characterization of fumed silica added PMMA denture base materials 制备添加了气相二氧化硅的 PMMA 义齿基托材料并确定其特性

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-17 DOI: 10.1080/1023666X.2024.2410754

Hakki Cenker Kucukesmen , Mehmet Fahri Sarac

This study was carried out to investigate the chemical, mechanical, and structural properties of increasing amounts of fumed silica added to PMMA denture base material. The effect of adding fumed silica at three different concentrations (0.5%, 1%, and 2% by weight) to PMMA was studied using Fourier transform infrared spectroscopy (FTIR), dynamic mechanical analysis (DMA), density, flexural strength, hardness, atomic force microscopy (AFM), and scanning electron microscopy (SEM). The results showed that the highest flexural strength values (105.64 MPa) and hardness (20.07 microvickers) were obtained with 1% wt. of fumed silica material. According to DMA results, fumed silica samples containing 1% wt. had the highest energy storage (3.24 GPa at 30 °C) and glass transition temperature. As a result, fumed silica in PMMA denture base material reached its maximum saturation limit at 1% wt. A more brittle behavior was observed in samples containing 2% fumed silica, which accumulated on the surface, as confirmed by AFM. The molecular bonds at the resin-fumed silica interface weaken due to the agglomeration of fumed silica. Consequently, the flexural strength and hardness decrease, along with the glass transition temperature and storage modulus. The potential applications of this research are vast, inspiring further exploration and innovation in denture-based materials.

本研究旨在探讨在 PMMA 义齿基底材料中添加更多气相二氧化硅的化学、机械和结构特性。使用傅立叶变换红外光谱（FTIR）、动态机械分析（DMA）、密度、抗弯强度、硬度、原子力显微镜（AFM）和扫描电子显微镜（SEM）研究了在 PMMA 中添加三种不同浓度（0.5%、1% 和 2% 重量百分比）的气相法二氧化硅的效果。结果表明，重量百分比为 1%的气相法二氧化硅材料获得了最高的抗弯强度值（105.64 兆帕）和硬度（20.07 微伏）。根据 DMA 结果，含 1%重量的气相法二氧化硅样品具有最高的储能（30 °C 时为 3.24 GPa）和玻璃化转变温度。因此，PMMA 义齿基底材料中的气相法二氧化硅在 1%重量比时达到最大饱和极限。经原子力显微镜（AFM）确认，气相二氧化硅含量为 2% 的样品中的气相二氧化硅聚集在表面，表现出更脆的特性。由于气相二氧化硅的聚集，树脂-气相二氧化硅界面上的分子键减弱。因此，弯曲强度和硬度降低，玻璃化转变温度和储存模量也随之降低。这项研究的潜在应用领域非常广泛，激励着人们在义齿材料方面进行进一步的探索和创新。

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引用次数: 0

High-performance biodegradable triboelectric nanogenerators using CoFe2O4 filled poly (butylene adipate-co-terephthalate) 使用 CoFe2O4 填充聚（己二酸丁二醇酯-对苯二甲酸乙二醇酯）的高性能可生物降解三电纳米发电机

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-14 DOI: 10.1080/1023666X.2024.2410762

Vishnu Kadabahalli Thammannagowda , Kariyappa Gowda Guddenahalli Shivanna , Smitha Ankanahalli Shankaregowda , Prashantha Kalappa

The hunt for sustainable and efficient energy harvesting and storage devices has driven significant interest in triboelectric nanogenerators (TENGs) as potential alternatives to traditional batteries for powering electronic devices. However, the development of biodegradable TENGs remains a formidable challenge. This study presents the preparation of a tribopositive material entirely composed of biodegradable poly(butylene adipate-co-terephthalate) (PBAT) polymer enhanced with CoFe₂O₄ (CF) nanoparticles. The CF nanoparticles, synthesized via the combustion method, were incorporated into the PBAT matrix through solvent casting to form films with varied filler content (0.2, 0.4, 0.6, 0.8, and 1 g). The CF nanoparticles structural, surface, and electrical properties were characterized using XRD and FTIR spectroscopy. At the same time, the morphology of the nanomaterials and their composites was analyzed by scanning electron microscopy. Specifically, the 0.8 g PBAT-CF TENG demonstrated superior performance, achieving an output voltage of 45.45 V and a current of 4.5 µA. Subsequent electrical studies, including charging commercial capacitors (1.0 to 47 μF) and powering LEDs and calculators, underscored the device’s efficiency. The PBAT-CF TENG also effectively generated voltage and current signals from physical activities like walking and jumping. This innovative approach highlights the potential for biodegradable, high-performing, self-powered flexible electronics, and wearable devices, paving the way for sustainable technological advancements.

对可持续和高效能源采集和存储设备的追求，促使人们对三电纳米发电机（TENGs）产生了浓厚的兴趣，并将其作为传统电池的潜在替代品，为电子设备供电。然而，开发可生物降解的 TENGs 仍然是一项艰巨的挑战。本研究介绍了一种完全由可生物降解的聚己二酸丁二醇酯（PBAT）聚合物和 CoFe2O4（CF）纳米颗粒组成的摩擦正极材料的制备方法。通过燃烧法合成的 CF 纳米粒子通过溶剂浇铸法加入到 PBAT 基质中，形成不同填料含量（0.2、0.4、0.6、0.8 和 1 克）的薄膜。利用 XRD 和傅立叶变换红外光谱对 CF 纳米粒子的结构、表面和电学特性进行了表征。同时，利用扫描电子显微镜分析了纳米材料及其复合材料的形态。具体而言，0.8 克 PBAT-CF TENG 表现出卓越的性能，输出电压达到 45.45 V，电流为 4.5 µA。随后进行的电学研究，包括为商用电容器（1.0 至 47 μF）充电以及为 LED 和计算器供电，都凸显了该器件的效率。PBAT-CF TENG 还能有效地从步行和跳跃等身体活动中产生电压和电流信号。这种创新方法凸显了可生物降解、高性能、自供电柔性电子器件和可穿戴设备的潜力，为可持续技术进步铺平了道路。

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引用次数: 0

Mechanical, Thermal, and Water Absorption Behavior of Ash Gourd (Benincasa Hispida) Peel Particles Filled Epoxy Composites 灰葫芦（Benincasa Hispida）果皮颗粒填充环氧树脂复合材料的力学、热学和吸水性能

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-02 DOI: 10.1080/1023666X.2024.2378890

Amit Agarwal , Vikas Upadhyay

Recently, bio-composites have attracted much attention due to their potential applications in various industries. The most notable benefits are the product’s low cost, biodegradability, lightweight, availability, and ability to solve environmental issues. The present research utilizes ash gourd (Benincasa hispida) peel, a food waste, as a filler material to produce epoxy (EP) composites. The effect of ash gourd peel particle percentage (ranging from 0 to 25 wt.%) was studied on the developed composites’ mechanical and thermal properties and water absorption behavior. The maximum tensile strength, flexural strength, and shore D hardness were 47.52 MPa, 2409.17 MPa, and 79.6respectively, when the ash gourd peel was 5% by weight in the composite. It was observed that the mechanical characteristics of manufactured bio-composites are negatively affected by the high concentration of ash gourd peel particles in the epoxy matrix. Also, increasing ash gourd peel particle fraction increases the water absorption of composites when immersed in distilled, sea, and tap water. The composite with 5% filler by weight absorbs water at a minimal rate when immersed in seawater. Thermogravimetric analysis was conducted to investigate the newly developed composite’s thermal behavior. In addition, a morphological examination of the fractured surfaces was carried out with assistance from a scanning electron microscope. The work presents ash gourd peel particles as the potential alternative to be used as filler in composites.

最近，生物复合材料因其在各行各业的潜在应用而备受关注。其最显著的优点是成本低、可生物降解、重量轻、可用性强，并能解决环境问题。本研究利用食物垃圾灰葫芦（Benincasa hispida）皮作为填充材料，生产环氧树脂（EP）复合材料。研究了灰瓜皮颗粒百分比（0 至 25 wt.%）对所开发复合材料机械性能、热性能和吸水性能的影响。当灰瓜皮在复合材料中的重量百分比为 5%时，复合材料的最大拉伸强度、弯曲强度和邵氏 D 硬度分别为 47.52 兆帕、2409.17 兆帕和 79.6。据观察，环氧基体中高浓度的灰瓜皮颗粒会对制造的生物复合材料的机械特性产生负面影响。此外，增加灰瓜皮颗粒的比例会增加复合材料在蒸馏水、海水和自来水中的吸水性。按重量计含有 5%填料的复合材料在浸入海水时的吸水率极低。为研究新开发的复合材料的热行为，进行了热重分析。此外，还利用扫描电子显微镜对断裂表面进行了形态学检查。这项研究提出了灰瓜皮颗粒作为复合材料填料的潜在替代品。

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引用次数: 0

Micromechanical modeling, thermal, and dielectric studies of poly (methyl methacrylate)-barium titanate composites 聚（甲基丙烯酸甲酯）-钛酸钡复合材料的微机械建模、热和介电研究

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-02 DOI: 10.1080/1023666X.2024.2391802

K. Umashankar , G. Kamala Vasanth , R. Krishna Prasad

Polymer composites containing poly (methyl methacrylate) (PMMA) and barium titanate (BaTiO₃) were synthesized using the solution mixing method. The electrical conductivity of PMMA is 6 × 10⁻⁹ S/cm, and adding 2% fillers reduces to 5 × 10⁻⁹ S/cm. The melting point of PMMA is 373 °C, and adding 2% and 4% fillers increased it to 376 °C and 379 °C, respectively. The polymer chains become less mobile and block macromolecules on the filler surface. The modulus of elasticity and mechanical tensile stress of the polymer composites with a 5-wt% of BaTiO₃ are 759.3 MPa and 75.6 MPa, respectively. The breakdown strength of PMMA is 203 KV and reduces with the addition of 5% filler to 144 KV. The values of E c/E m evaluated using the Tsai-Pagano, Christensen-Waals, ROM, Mori-Tanaka, and Halpin-Tsai models underpredict the modulus compared to experimental E c/E m values. Fourier spectroscopy confirmed the presence of Ti-O and BaTiO₃ bonds in the polymer composite. Scanning electron microscope images reveal spherical aggregates of BaTiO₃ coated with PMMA and an interparticle network. The dielectric constant of PMMA is 3 and increased with the addition of 2% and 4% fillers to 4 and 4.3, respectively.

采用溶液混合法合成了含有聚甲基丙烯酸甲酯（PMMA）和钛酸钡（BaTiO3）的聚合物复合材料。PMMA 的导电率为 6 × 10-9 S/cm，添加 2% 的填料后，导电率降至 5 × 10-9 S/cm。PMMA 的熔点为 373 ℃，添加 2% 和 4% 的填料后，熔点分别升至 376 ℃ 和 379 ℃。聚合物链的流动性变小，阻塞了填料表面的大分子。含有 5 重量百分比 BaTiO3 的聚合物复合材料的弹性模量和机械拉伸应力分别为 759.3 兆帕和 75.6 兆帕。PMMA 的击穿强度为 203 KV，添加 5%的填料后降至 144 KV。与实验 E c/E m 值相比，使用 Tsai-Pagano、Christensen-Waals、ROM、Mori-Tanaka 和 Halpin-Tsai 模型评估的 E c/E m 值对模量的预测不足。傅立叶光谱证实聚合物复合材料中存在 Ti-O 和 BaTiO3 键。扫描电子显微镜图像显示了涂有 PMMA 的 BaTiO3 的球形聚集体和粒子间网络。PMMA 的介电常数为 3，添加 2% 和 4% 的填料后，介电常数分别增至 4 和 4.3。

{"title":"Micromechanical modeling, thermal, and dielectric studies of poly (methyl methacrylate)-barium titanate composites","authors":"K. Umashankar , G. Kamala Vasanth , R. Krishna Prasad","doi":"10.1080/1023666X.2024.2391802","DOIUrl":"10.1080/1023666X.2024.2391802","url":null,"abstract":"<div><div>Polymer composites containing poly (methyl methacrylate) (PMMA) and barium titanate (BaTiO<sub>3</sub>) were synthesized using the solution mixing method. The electrical conductivity of PMMA is 6 × 10<sup>−9</sup> S/cm, and adding 2% fillers reduces to 5 × 10<sup>−9</sup> S/cm. The melting point of PMMA is 373 °C, and adding 2% and 4% fillers increased it to 376 °C and 379 °C, respectively. The polymer chains become less mobile and block macromolecules on the filler surface. The modulus of elasticity and mechanical tensile stress of the polymer composites with a 5-wt% of BaTiO<sub>3</sub> are 759.3 MPa and 75.6 MPa, respectively. The breakdown strength of PMMA is 203 KV and reduces with the addition of 5% filler to 144 KV. The values of <em>E c</em>/<em>E m</em> evaluated using the Tsai-Pagano, Christensen-Waals, ROM, Mori-Tanaka, and Halpin-Tsai models underpredict the modulus compared to experimental <em>E c</em>/<em>E m</em> values. Fourier spectroscopy confirmed the presence of Ti-O and BaTiO<sub>3</sub> bonds in the polymer composite. Scanning electron microscope images reveal spherical aggregates of BaTiO<sub>3</sub> coated with PMMA and an interparticle network. The dielectric constant of PMMA is 3 and increased with the addition of 2% and 4% fillers to 4 and 4.3, respectively.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"29 7","pages":"Pages 521-532"},"PeriodicalIF":1.7,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced performance in a NASICON-incorporated solid polymer electrolyte 性能增强的 NASICON 掺杂固体聚合物电解质

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-02 DOI: 10.1080/1023666X.2024.2383460

Dharmendra Kumar , Shweta Mukherjee , Avirup Das

In the present work, a novel ‘doped ceramic-polymer composite’-based solid polymer electrolytes (SPEs) has been synthesized using Zr (LAZTP) and Nb (LANbTP)-doped LATP as a ceramic filler and polyacrylonitrile (PAN) as a host polymer via the solution cast method. A series of SPEs with different ceramic loadings ranging from 10, 20, 30, 40, and 80 wt. % have been investigated using XRD, SEM, and impedance analysis. XRD spectra show the presence of crystalline ceramic peaks in composite solid polymer electrolyte. Further, the homogeneous distribution of the filler has been confirmed by SEM images. For SPEs, the highest conductivity of 5.31 × 10⁻⁵ S cm⁻¹ has been obtained for PAN + LANbTP30 at room temperature. Whereas, the optimized conductivity for LATP-incorporated PAN shows 1.79 × 10⁻⁵ S cm⁻¹, and the LAZTP-incorporated sample shows a conductivity of 3.03 × 10⁻⁵ S cm⁻¹ at room temperature. Also, LANbTP-contained SPE shows excellent voltage stability of 4.90 V w.r.t. pure PAN.

本研究采用掺杂 Zr (LAZTP) 和 Nb (LANbTP) 的 LATP 作为陶瓷填料，以聚丙烯腈 (PAN) 作为主聚合物，通过溶液浇铸法合成了一种新型的 "掺杂陶瓷-聚合物复合材料 "型固体聚合物电解质 (SPE)。我们使用 XRD、SEM 和阻抗分析法研究了一系列具有不同陶瓷负载量（10、20、30、40 和 80 重量百分比）的 SPE。XRD 光谱显示，在复合固体聚合物电解质中存在结晶陶瓷峰。此外，SEM 图像也证实了填料的均匀分布。对于 SPE，PAN + LANbTP30 在室温下的最高电导率为 5.31 × 10-5 S cm-1。而加入 LATP 的 PAN 的最佳电导率为 1.79 × 10-5 S cm-1，加入 LAZTP 的样品在室温下的电导率为 3.03 × 10-5 S cm-1。此外，与纯 PAN 相比，含有 LANbTP 的 SPE 显示出 4.90 V 的出色电压稳定性。

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引用次数: 0

Fabrication, structure and optical characteristics of CuO/polymer nanocomposites materials for optical devices 用于光学设备的氧化铜/聚合物纳米复合材料的制备、结构和光学特性

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-02 DOI: 10.1080/1023666X.2024.2397392

B. M. Alotaibi , Reem Altuijri , A. Atta , E. Abdeltwab , M. M. Abdelhamied

The films of P(4ClAni)/CuO, which formed of mixing poly 4-chloroaniline P(4ClAni) by CuO, were fabricated by the casting solution method. The XRD confirmed the successful prepration of the P(4ClAni)/CuO films. Additionally, the effect of CuO on the optical characteristics was determined. The CuO increased the refractive index from 1.09 for P(4ClAni) to 1.11 for P(4ClAni)/CuO-1, and 1.19 for P(4ClAni)/CuO-3, respectively, while the oscillation energy E₀ dropped from 4.29 eV for P(4ClAni) to 3.57 eV for P(4ClAni)/CuO-1, 3.12 eV for P(4ClAni)/CuO-2, and 3.06 eV for P(4ClAni)/CuO-3. The charge transfer between P(4ClAni) and CuO increased optical conductivity as the CuO ratios increased. This suggests that modifications in the electronic structure of the composite due to the interactions between P(4ClAni) and CuO. Also, the plasma frequency increased from 0.87 x 10¹² s⁻¹ to 2.32 x 10¹² s⁻¹. These changes in optical parameters occurred when the polarization of the P(4ClAni)/CuO was altered. The study elucidated the advantages of incorporating CuO nanoparticles as fillers in improving the properties of P(4ClAni) structures. The obtained results indicate the P(4ClAni)/CuO composites were sucessfuly fabricated with novel characteristics that can be applied in flexible optical devices.

采用浇铸溶液法制备了聚 4-氯苯胺 P(4ClAni)/CuO 薄膜，该薄膜由 CuO 与聚 4-氯苯胺 P(4ClAni) 混合而成。XRD 证实了 P(4ClAni)/CuO 薄膜的成功制备。此外，还测定了 CuO 对光学特性的影响。CuO 分别将折射率从 P(4ClAni) 的 1.09 提高到 P(4ClAni)/CuO-1 的 1.11 和 P(4ClAni)/CuO-3 的 1.19，而振荡能 E0 则从 P(4ClAni)/CuO-1 的 4.29 eV下降到P(4ClAni)/CuO-1的3.57 eV、P(4ClAni)/CuO-2的3.12 eV和P(4ClAni)/CuO-3的3.06 eV。随着 CuO 比率的增加，P(4ClAni) 和 CuO 之间的电荷转移提高了光导率。这表明，P(4ClAni) 和 CuO 之间的相互作用改变了复合材料的电子结构。此外，等离子体频率从 0.87 x 1012 s-1 增加到 2.32 x 1012 s-1。当改变 P(4ClAni)/CuO 的极化时，光学参数就会发生这些变化。该研究阐明了加入 CuO 纳米粒子作为填料在改善 P(4ClAni) 结构性能方面的优势。研究结果表明，P(4ClAni)/CuO 复合材料的成功制备具有新颖的特性，可应用于柔性光学器件。

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引用次数: 0

Effect of heat treatment on charge states, thermophysical and mechanical properties of polypropylene doped with ZrO2 nanoparticles 热处理对掺杂 ZrO2 纳米粒子的聚丙烯的电荷状态、热物理性能和机械性能的影响

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-02 DOI: 10.1080/1023666X.2024.2387605

Hijran S. Ibrahimova , Tahir D. Ibragimov

Charge states, thermophysical and mechanical properties of polypropylene doped with zirconium oxide nanoparticles, and their changes during heat treatment at temperatures 60 °C, 100 °C, and 140 °C are studied. The methods used are thermal stimulated depolarization (TSD), scanning differential calorimetry (SDC), and mechanical life assessment. It is shown that with an increase in the concentration of the filler, the intensity of the TSD peaks increases up to 3 vol.%. A further increase in concentration leads to a decrease in the intensity of the peaks. The activation energy of charge release from traps, temperature of maximum of the peaks, and the magnitude of the accumulated charge in the traps have also maximal value at nanoparticle concentration of 3 vol.%. The study of charge characteristics of the nanocomposite with concentration of 3 vol.% after heat treatment shows that the intensity of TSD peaks, the temperature of peak maxima, and the activation energy of charge release increase with increasing pretreatment temperature. The magnitude of the charge accumulated in traps has a maximal value at treatment temperature of 140 °C owing to the increase in the number of traps. The melting point of the composite is 149.38 °C and shifts to 146.88 °C after heat treatment at 140 °C. It indicates that the high temperature of heat treatment leads to partial destruction of polymer chains, leading to a decrease in the critical melting temperature. The mechanical durability of PP + 3%ZrO₂ nanocomposite decreases with increase in pretreatment temperature.

掺杂纳米氧化锆的聚丙烯的电荷状态、热物理性能和机械性能及其在 60 ℃、100 ℃ 和 140 ℃ 热处理过程中的变化...

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引用次数: 0

Improving flame resistance and shielding properties for cross-linked polyethylene (XLPE) using nanoclay filler 使用纳米粘土填料提高交联聚乙烯（XLPE）的阻燃性和屏蔽性能

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-02 DOI: 10.1080/1023666X.2024.2394226

Elsayeda F. Salem , Walaa Abd-Elmonem Elkatan , Nesreen R. Abdel Wahab

Polymers play an essential role in both industry and medical fields due to their diverse and adaptable properties. In this work, prepared crosslinking polyethylene (XLPE) samples with hydrophilic bentonite nanoclay fillers (H₂Al₂O₆Si) at concentrations of 0, 1, 2.5, 4, and 5 wt% enhance their flame-retardant and radiation shielding efficiency. The research investigated flame retardancy and thermal stability parameters. The XLPE/H₂Al₂O₆Si nanocomposite polymer sheets were exposed to a collimated beam of fast neutrons using an Am/Be neutron source (5 Ci) and to gamma radiation using a ¹³⁷Cs point source (5 μCi) to assess their radiation shielding properties. The study found that uniform dispersion of nanoclay particles enhanced the thermal properties of the composite, forming a char layer that acted as a barrier, slowing thermal decomposition and reducing the heat release rate. Limiting oxygen index (LOI) increased from 28% to 34%, and burning rate improved with higher nanoclay concentrations. Additionally, absorption and optical band gap calculations decreased with increasing filler concentrations. Radiation attenuation capabilities increased by approximately 40% for neutrons and 30% for gamma radiation compared to pure XLPE. The study concluded that incorporating nanoclay fillers into XLPE enhances its shielding capabilities and improves flame resistance properties, making the prepared samples suitable for various industrial applications.

聚合物因其多样化和适应性强的特性，在工业和医疗领域都发挥着至关重要的作用。在这项工作中，制备了具有亲水性的交联聚乙烯（XLPE）样品。

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引用次数: 0

Response surface methodology-based preparation of sago starch bioplastic film for food packaging 基于响应面方法制备食品包装用西米淀粉生物塑料薄膜

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-02 DOI: 10.1080/1023666X.2024.2383480

Shikha Guleria , Harpreet Singh , Atul Jain , Shailendra Kumar Arya , Sanjeev Puri , Madhu Khatri

The increase in the use of plastics during the past few decades has caused environmental pollution due to the non-biodegradable and recalcitrance nature of the plastics. This has caused great problems for the solid waste management efforts. The development of biodegradable polymers from natural and renewable ingredients can address the challenges caused by plastic pollution. The present work deals with the optimization of the preparation process of sago starch-based biodegradable bioplastic films. The sago starch, glycerol-sorbitol mixture, and chitosan were used as polysaccharides, plasticizers, and antimicrobial agents, respectively. The factors screening and design optimization were performed using response surface methodology and Box-Behnken Design to investigate the interactions between all components in the film preparation. Furthermore, the developed bioplastic films were characterized through field emission scanning electron microscopy and Fourier transform infrared spectroscopy. The antimicrobial susceptibility assay showed the inhibition of the growth of Bacillus pumilus and Alcaligenes faecalis XF1 by incorporation of cinnamon essential oil into the film. Moreover, the developed films successfully reduced the proliferation of fungal growth on packaged bread samples. The microbial analysis found that the shelf life of the wheat bread was improved from 3 to 15 days. The sago starch bioplastic films developed in this study can potentially meet the requirements for food packaging films.

由于塑料具有不可生物降解和难降解的特性，过去几十年中塑料使用量的增加造成了环境污染。这给固体废物管理工作带来了很大的问题。利用天然和可再生成分开发生物可降解聚合物可以解决塑料污染带来的挑战。本研究涉及西米淀粉基生物可降解生物塑料薄膜制备工艺的优化。西米淀粉、甘油-山梨醇混合物和壳聚糖分别用作多糖、增塑剂和抗菌剂。采用响应面法和箱-贝肯设计法进行了因素筛选和优化设计，以研究制备薄膜过程中所有成分之间的相互作用。此外，还通过场发射扫描电子显微镜和傅立叶变换红外光谱对所制备的生物塑料薄膜进行了表征。抗菌药敏试验表明，在薄膜中加入肉桂精油可抑制枯草芽孢杆菌和粪肠球菌 XF1 的生长。此外，开发的薄膜还成功地减少了包装面包样品上真菌的增殖。微生物分析发现，小麦面包的保质期从 3 天延长到了 15 天。本研究开发的西米淀粉生物塑料薄膜有可能满足食品包装薄膜的要求。

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