International Journal of Polymer Analysis and Characterization最新文献_第8页

Tamarind gum based magnesium ion conducting polymer membrane for energy storage applications 罗望子胶基镁离子导电聚合物储能膜

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2025-01-02 DOI: 10.1080/1023666X.2024.2416212

P. Saranya , K. Sundaramahalingam , D. Vanitha , M. Nandhinilakshmi , V. N. Vijayakumar

A solid bio polymer electrolyte (SPE) based on tamarind gum (TG) and magnesium nitrate was synthesized by a solution casting technique. The amorphous behavior is observed by X-ray diffraction (XRD) analysis, and the degree of crystallinity is calculated from the XRD deconvolution spectra. The interaction between the polymer and the salt was confirmed by Fourier transform infrared (FTIR) analysis. Using FTIR deconvolution spectra, the percentage of free ions can be calculated. The glass transition temperature (T_g) was determined via differential scanning calorimetry (DSC). A higher ionic conductivity (σ) of 1.97 × 10⁻⁴ S/cm is observed for the sample with 1 g of tamarind gum and 0.5 g of magnesium nitrate (4 TMN). The conduction mechanism shows that sample 4 TMN obeys the quantum mechanical tunneling model (QMT) at low frequency. The prepared SPEs follow the Arrhenius behavior, and the minimum activation energy (E_a) of 0.207 eV is observed for sample 4 TMN. The lowest relaxation time (τ) was 3.46 × 10⁻⁷ s for 4-TMN according to the tangent spectra. The transference number of ions (t_ion) is calculated by Wagner’s polarization method. The electrochemical stability window observed by linear sweep voltammetry (LSV) is 2.25 V. The primary battery is fabricated by using sample 4TMN, and an open circuit voltage (OCV) of 2.01 V is observed.

采用溶液铸造法制备了罗望子胶（TG）和硝酸镁为基材的固体生物聚合物电解质（SPE）。通过x射线衍射（XRD）分析观察了非晶态行为，并通过XRD反褶积谱计算了结晶度。傅里叶变换红外（FTIR）分析证实了聚合物与盐的相互作用。利用FTIR反褶积光谱，可以计算出自由离子的百分比。通过差示扫描量热法（DSC）测定了玻璃化转变温度（Tg）。加入1 g罗望子胶和0.5 g硝酸镁（4 TMN）的样品离子电导率（σ）较高，为1.97 × 10−4 S/cm。传导机理表明，样品4在低频处服从量子力学隧穿模型（QMT）。制备的spe符合Arrhenius行为，样品4 TMN的最小活化能（Ea）为0.207 eV。根据正切谱，4-TMN的最低弛豫时间τ为3.46 × 10−7 s。用瓦格纳极化法计算离子迁移数。线性扫描伏安法（LSV）观察到的电化学稳定窗口为2.25 V。用4TMN制备了一次电池，得到了2.01 V的开路电压。

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引用次数: 0

Induction of physico-chemical properties in mercerized Yucca filamentosa fiber-based graft copolymer through response surface methodology and its characterization 响应面法诱导丝光丝兰纤维基接枝共聚物的理化性质及其表征

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2025-01-02 DOI: 10.1080/1023666X.2024.2419050

Surjit Kaur , Mithu Maiti Jana , Asim Kumar Jana

This research article describes the physicochemical modification of mercerized Yucca filamentosa (Yf_m) fiber by graft copolymerization with ethylmethacrylate, using ferrous ammonium sulfate-potassium persulfate (FAS-KPS) as a redox initiator. Initially, six process parameters; reaction duration, reaction temperature, solvent amount, pH, FAS:KPS ratio, and monomer concentration were used in the study in a sequential experimental design technique, and the significant process variables affecting the yield of the graft copolymer were identified. The resolution-V design method identified the significant parameters as the reaction temperature, amount of solvent, and the concentration of monomer. In second phase of the study, the screened variables were utilized in the development of a model through the technique of response surface methodology (RSM) for the prediction of the yields, and its optimization. The developed RSM model fitted well with the experimental data, and predicted for the optimal conditions of reactions as reaction duration 120 min, pH 7.0, and the monomer 2.96 × 10⁻³mol/L; at which the highest graft yield percentage obtained was 133.7%. The techniques of FTIR, SEM, and XRD were used for the characterization of untreated fiber, mercerized fiber, and graft copolymers. Studies of the various physico-chemical properties showed that the produced graft copolymers were more resistant to acid and base than the both natural and mercerized fibers.

本文研究了以硫酸亚铁铵-过硫酸钾（FAS-KPS）为氧化还原引发剂，与甲基丙烯酸乙酯接枝共聚丝光丝兰（Yfm）纤维的理化改性。最初有六个工艺参数；采用序贯实验设计技术对反应时间、反应温度、溶剂量、pH、FAS:KPS比、单体浓度等因素进行了研究，确定了影响接枝共聚物收率的重要工艺变量。采用分辨率- v设计方法确定了反应温度、溶剂用量和单体浓度是影响反应的重要参数。在研究的第二阶段，利用筛选的变量，通过响应面法（RSM）技术建立模型，用于产量的预测和优化。建立的RSM模型与实验数据拟合良好，预测反应的最佳条件为反应时间120 min， pH 7.0，单体质量分数2.96 × 10−3 mol/L；所得接枝率最高为133.7%。利用红外光谱（FTIR）、扫描电镜（SEM）和x射线衍射（XRD）等技术对未处理纤维、丝光后纤维和接枝共聚物进行了表征。各种理化性能的研究表明，所制备的接枝共聚物比天然纤维和丝光纤维都具有更强的耐酸和耐碱性能。

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引用次数: 0

Extraction, characterization, and evaluation of galactomannan from Barbatimão Verdadeiro as a potential additive for enhanced oil recovery fluids barbaratim<e:1> o Verdadeiro中半乳甘露聚糖作为一种潜在的提高采收率的添加剂的提取、表征和评价

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2025-01-02 DOI: 10.1080/1023666X.2024.2421817

Mariana S. Aquino , Juliana P. Senna , Claudia R. E. Mansur

Polymers play a crucial role in enhanced oil recovery (EOR) by increasing the viscosity of injection fluids and enhancing oil displacement. The widely used polymer, partially hydrolyzed polyacrylamide (HPAM), faces performance degradation in high-salinity and high-temperature environments. This study explores galactomannan from Stryphnodendron polyphyllum seeds as an alternative viscosifying agent for EOR fluids. An extraction process for galactomannan from Barbatimão Verdadeiro seeds was developed, yielding 23.3% m/m. The biopolymer was characterized using Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), thermogravimetric analysis (TGA), and size exclusion chromatography (SEC). Rheological behavior was tested in brines of different salinities, and injectivity/filterability tests were performed following API RP 63:1990 standards. The galactomannan obtained from Stryphnodendron polyphyllum exhibited a mannose-to-galactose ratio of 1.32. Rheological analysis showed pseudoplastic behavior, with viscosities of 38 cP in brine solutions at 7.37 s⁻¹ and 60 °C. Filterability tests demonstrated satisfactory injectivity with factors of 1.09 (8 µm) and 0.67 (1.2 µm). Compared to HPAM, galactomannan exhibited superior viscosity retention in high-salinity conditions, where HPAM dropped to 6 cP. The galactomannan extracted from Stryphnodendron polyphyllum seeds is a promising biopolymer for EOR applications, offering superior performance under harsh conditions compared to traditional HPAM. Its resilience to high salinity and temperature makes it a viable alternative for pre-salt and offshore fields, contributing to more sustainable and efficient oil recovery.

聚合物通过增加注入液的粘度和提高驱油量，在提高采收率（EOR）方面发挥着至关重要的作用。部分水解聚丙烯酰胺（HPAM）是一种广泛应用的聚合物，在高盐度和高温环境中存在性能退化问题。本研究探讨了半乳甘露聚糖作为提高采收率液体的一种替代增粘剂。开发了从baratim o Verdadeiro种子中提取半乳甘露聚糖的工艺，产量为23.3% m/m。采用傅里叶变换红外光谱（FTIR）、核磁共振（NMR）、热重分析（TGA）和粒径排除色谱（SEC）对该生物聚合物进行了表征。在不同盐度的盐水中测试了流变行为，并按照API RP 63:1990标准进行了注入性/滤过性测试。从毛茛中提取的半乳甘露聚糖甘露糖与半乳糖的比值为1.32。流变学分析显示出假塑性行为，在7.37 s−1和60°C的盐水溶液中粘度为38 cP。滤过性测试表明，注入率为1.09（8µm）和0.67(1.2µm)，令人满意。与HPAM相比，半乳甘露聚糖在高盐度条件下表现出更好的粘度保持，HPAM降至6 cP。从毛茛种子中提取的半乳甘露聚糖是一种很有前途的EOR生物聚合物，与传统的HPAM相比，它在恶劣条件下具有优越的性能。它对高盐度和高温度的适应性使其成为盐下油田和海上油田的可行替代方案，有助于实现更可持续、更高效的采油。

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引用次数: 0

Technique for measuring the low pull-out forces of bonded fibers: application to glue-based false eyelashes 测定粘合纤维低拔出力的技术：在胶基假睫毛上的应用

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-12-31 DOI: 10.1080/1023666X.2024.2441939

Nathan Macdonald , Jimmy Mays

Until now, no method has been reported for measuring fiber pull-out forces in false eyelashes. Many false eyelashes are handmade and are comprised of poly(butylene terephthalate) (PBT) lashes with glue bases. Due to their small size, delicate nature, and complexity with regards to varying depths of embedment, angle of attachment of fibers to the base, and physical interactions between fibers of false eyelashes, conventional tensile testing machines are not able to grip individual lashes and accurately measure the small forces of detachment. In this work, a custom tensile testing instrument was used to investigate the effect of an approximately 120 °C curling step on the strength of adhesion of PBT fibers to the glue base. To account for the effects of structural complexity on the mechanical pull-out strength of individual fibers, 20 individual fibers were pulled from 11 different models of eyelashes, both before and after curling. A Kolmogorov-Smirnov normality test was employed to assure the data collected were normally distributed, and means and standard deviations were calculated. A two-tailed t-test revealed that 10 of the 11 tested eyelash models showed no statistically significant difference in mechanical strength before versus after the curling process.

到目前为止，还没有一种方法可以测量假睫毛的纤维拔出力。许多假睫毛是手工制作的，由聚对苯二甲酸丁二酯（PBT）睫毛和胶基组成。由于假睫毛的尺寸小，性质精细，嵌入深度、纤维与底座的附着角度以及纤维之间的物理相互作用等方面的复杂性，传统的拉伸试验机无法抓住单个睫毛并准确测量微小的脱离力。在这项工作中，使用定制的拉伸测试仪器来研究大约120°C卷曲步骤对PBT纤维与胶基粘合强度的影响。为了解释结构复杂性对单个纤维机械拔出强度的影响，研究人员从11种不同的睫毛模型中提取了20根单独的纤维，包括卷睫毛之前和卷睫毛之后。采用Kolmogorov-Smirnov正态性检验，确保所收集的数据为正态分布，并计算均值和标准差。双尾t检验显示，11个被测试的睫毛模型中有10个在卷曲过程之前和之后的机械强度没有统计学上的显著差异。

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引用次数: 0

Layered double hydroxide reinforced thermal expansion fire extinguishing agent for potential solid fire prevention 层状双氢氧化物增强热膨胀灭火剂，用于潜在固体防火

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-12-26 DOI: 10.1080/1023666X.2024.2444293

Weining Du , Yaqiang Jiang , Mingqiang Yan , Zejiang Zhang , Jun Deng , Zhicheng Xie

In this work, phosphorus-decorated Zn-Al-CO₃ layered double hydroxide (PLDH) was prepared via a co-precipitation strategy and thus introduced into intumescent flame retardant dispersion to fabricate PLDH-reinforced thermal expansion fire extinguishing agent (FEA@PLDH). It was found that the phosphorus-containing unit was successfully anchored onto the PLDH. The prepared FEA@PLDH solution with a viscosity of 146 mPa·s exhibited good interfacial compatibility with the ethylene-vinyl acetate (EVA) surface. Taking advantage of the synergistic catalytic carbonization and expanded insulating barrier effects of FEA@PLDH, the corresponding coated EVA (EVA-FEA@PLDH1) with 1 wt% of PLDH could form a continuous and compact carbonaceous block layer under fire or high-temperature conditions. Meanwhile, the LOI for EVA-FEA@PLDH1 was increased from 22.0% to 32.0% and reached the UL-94 rating of V0. Moreover, EVA-FEA@PLDH1 showed delayed TTI (77 s) and T_PHRR (146 s), with 6% and 44% reductions in THR and TSP, respectively, and 43% increment in residual char, as compared to the EVA-FEA. In addition, fire resistance experiment revealed that EVA-FEA@PLDH1 could withstand the ∼1300 °C flame for 467 s longer than that of the EVA-FEA (171 s). This research provides an intriguing fire extinguishing agent for the potential fire prevention of flammable polymer materials.

本研究通过共沉淀法制备了磷修饰的Zn-Al-CO3层状双氢氧化物（PLDH），并将其引入膨胀型阻燃分散剂中，制备了PLDH增强热膨胀灭火剂（FEA@PLDH）。结果发现，含磷单元成功地锚定在PLDH上。制备的FEA@PLDH溶液粘度为146 mPa·s，与乙烯-醋酸乙烯（EVA）表面具有良好的界面相容性。利用FEA@PLDH的协同催化碳化和膨胀绝缘阻隔效应，相应的涂覆EVA （EVA-FEA@PLDH1）在火灾或高温条件下可形成连续致密的碳质块层。同时，EVA-FEA@PLDH1的LOI由22.0%提高到32.0%，达到UL-94等级V0。此外，与EVA-FEA相比，EVA-FEA@PLDH1显示延迟TTI （77 s）和TPHRR (146 s)， THR和TSP分别减少6%和44%，残余炭增加43%。此外，耐火实验表明，EVA-FEA@PLDH1比EVA-FEA （171 s）耐~ 1300°C火焰的时间长467 s。本研究为易燃高分子材料的潜在防火提供了一种有趣的灭火剂。

{"title":"Layered double hydroxide reinforced thermal expansion fire extinguishing agent for potential solid fire prevention","authors":"Weining Du , Yaqiang Jiang , Mingqiang Yan , Zejiang Zhang , Jun Deng , Zhicheng Xie","doi":"10.1080/1023666X.2024.2444293","DOIUrl":"10.1080/1023666X.2024.2444293","url":null,"abstract":"<div><div>In this work, phosphorus-decorated Zn-Al-CO<sub>3</sub> layered double hydroxide (PLDH) was prepared via a co-precipitation strategy and thus introduced into intumescent flame retardant dispersion to fabricate PLDH-reinforced thermal expansion fire extinguishing agent (FEA@PLDH). It was found that the phosphorus-containing unit was successfully anchored onto the PLDH. The prepared FEA@PLDH solution with a viscosity of 146 mPa·s exhibited good interfacial compatibility with the ethylene-vinyl acetate (EVA) surface. Taking advantage of the synergistic catalytic carbonization and expanded insulating barrier effects of FEA@PLDH, the corresponding coated EVA (EVA-FEA@PLDH1) with 1 wt% of PLDH could form a continuous and compact carbonaceous block layer under fire or high-temperature conditions. Meanwhile, the LOI for EVA-FEA@PLDH1 was increased from 22.0% to 32.0% and reached the UL-94 rating of V0. Moreover, EVA-FEA@PLDH1 showed delayed TTI (77 s) and T<sub>PHRR</sub> (146 s), with 6% and 44% reductions in THR and TSP, respectively, and 43% increment in residual char, as compared to the EVA-FEA. In addition, fire resistance experiment revealed that EVA-FEA@PLDH1 could withstand the ∼1300 °C flame for 467 s longer than that of the EVA-FEA (171 s). This research provides an intriguing fire extinguishing agent for the potential fire prevention of flammable polymer materials.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 2","pages":"Pages 142-154"},"PeriodicalIF":1.7,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176511","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

Synthesis of PPy/CeO2 nanocomposites for supercapacitor application 超级电容器用PPy/CeO2纳米复合材料的合成

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-12-21 DOI: 10.1080/1023666X.2024.2440504

M. Vinitha , G. Velraj , K. Anandan , G. K. Meenatchi , Muthaiah Shellaiah

Polypyrrole is synthesized by the chemical oxidation polymerization method with K₂Cr₂O₇ as an oxidant, and H₂SO₄ as a dopant. This method was effective, as indicated by the large yield of PPy/CeO₂ (Polypyrrole/Cerium oxide) nanocomposite produced during synthesis. FT-IR spectra demonstrated the chemical interactions between PPy and CeO₂ nanoparticles. The prepared polypyrrole and polypyrrole nanocomposites were studied through structural and optical studies using XRD and UV-Vis analysis. Average crystalline sizes of PPy and PPy/CeO₂ nanocomposites are found to be 10.4 and 8.84 nm. The electrical conductivity of polypyrrole is lower than that of polypyrrole nanocomposite, which could be attributed to the inadequate hydration water as well as the surface conductivity carried through the thin polymer layer. In comparison to n-CeO₂PPy (433 F/g) and PPy (226 F/g) at the scan rate of 100 mV/s, the electrochemical measurements demonstrated that the fabricated electrode of n-CeO₂PPy is a suitable electrode material and can improve the capacitive performance of supercapacitors due to its high capacitive value (433 F/g). Electrochemical studies showed that CeO₂PPy nanocomposites (n-CeO₂PPy) have improved specific capacitance and reduced impedance compared to PPy. These improvements can be attributed to the synergistic effects between PPy and CeO₂PPy nanocomposites, which facilitate efficient charge transport and ion diffusion.

以K2Cr2O7为氧化剂，H2SO4为掺杂剂，采用化学氧化聚合法制备聚吡咯。该方法是有效的，制备的PPy/CeO2（聚吡咯/氧化铈）纳米复合材料收率高。FT-IR光谱显示了聚吡啶和CeO2纳米颗粒之间的化学相互作用。采用XRD和UV-Vis分析对制备的聚吡咯和聚吡咯纳米复合材料进行了结构和光学研究。PPy和PPy/CeO2纳米复合材料的平均晶粒尺寸分别为10.4和8.84 nm。聚吡咯的电导率低于聚吡咯纳米复合材料，这可能是由于水化水不足以及通过薄聚合物层携带的表面电导率所致。与扫描速率为100 mV/s的n-CeO2PPy （433 F/g）和PPy （226 F/g）相比，电化学测量结果表明，制备的n-CeO2PPy电极具有较高的电容值（433 F/g），是一种合适的电极材料，可以提高超级电容器的电容性能。电化学研究表明，与PPy相比，CeO2PPy纳米复合材料（n-CeO2PPy）具有更高的比电容和更低的阻抗。这些改进可归因于PPy和CeO2PPy纳米复合材料之间的协同作用，促进了有效的电荷传输和离子扩散。

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引用次数: 0

Effect of sodium chloride and water-soluble polymers on thermochromic properties of hydroxypropyl cellulose solution 氯化钠和水溶性聚合物对羟丙基纤维素溶液热致变色性能的影响

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-12-10 DOI: 10.1080/1023666X.2024.2435853

Ha Ngoc Giang , Dung Thi Phuong Truong , Xuan Kim Hoang , Tuan Nguyen Anh Huynh

Hydroxypropyl cellulose (HPC) and its rather low lower-critical-solution-temperature (LCST) were the main research targets in many recent publications. In this study, a simple and affordable approach to measure LCST using a Brookfield viscometer was presented. The setup using a popular hot plate and a silicone oil bath could well detect the HPC solution’s LCST values. The result was in good agreement with the particle size change obtained using the dynamic light scattering technique. The effect of polyacrylic acid (PAA) and other cellulose derivatives including hydroxypropyl methylcellulose (HPMC), hydroxyethyl cellulose (HEC), or sodium carboxymethyl cellulose (CMC) on HPC’s LCST was investigated. The mixture of HPC with PAA, HPMC, and CMC showed the lowest LCST. However, the effect of NaCl seemed to be stronger when the LCST value of only 28.5 °C was obtained with 1 wt% of HPC and 5 wt% of NaCl. Fourier-transformed infrared spectroscopy results also showed a stronger interaction of HPC/NaCl compared to the mixture with PAA of HPMC. The differential scanning calorimetry only detected the signal change correlated with LCST in the cooling cycle. The glass window fabricated with the current thermochromic solution was able to block and transmit visible light well at low and elevated temperatures, respectively.

羟丙基纤维素（HPC）及其较低的低临界溶液温度（LCST）是近年来许多出版物的主要研究对象。在这项研究中，一个简单的和负担得起的方法来测量LCST使用布鲁克菲尔德粘度计提出。使用流行的热板和硅油浴的设置可以很好地检测HPC溶液的LCST值。结果与动态光散射技术得到的颗粒尺寸变化结果吻合较好。研究了聚丙烯酸（PAA）和羟丙基甲基纤维素（HPMC）、羟乙基纤维素（HEC）、羧甲基纤维素钠（CMC）等纤维素衍生物对HPC的LCST的影响。HPC与PAA、HPMC和CMC混合的LCST最低。然而，当HPC添加量为1 wt%， NaCl添加量为5 wt%时，LCST值仅为28.5°C， NaCl的作用似乎更强。傅里叶变换红外光谱结果也表明，与HPMC的PAA混合物相比，HPC/NaCl的相互作用更强。差示扫描量热法仅检测冷却周期中与LCST相关的信号变化。用当前的热致变色溶液制作的玻璃窗在低温和高温下分别能够很好地阻挡和透射可见光。

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引用次数: 0

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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