International Journal of Polymer Analysis and Characterization最新文献

Insights to structural, morphological, thermal and spectroscopic properties of chitosan biopolymer functionalized with extracted dye of discarded Bougainvillea brackets (DBG) steps 废弃三角梅支架（DBG）步骤提取染料功能化壳聚糖生物聚合物的结构、形态、热、光谱特性研究

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2026-01-02 DOI: 10.1080/1023666X.2025.2548332

Ismael I. Huseen , Ary R. Murad , Shujahadeen B. Aziz

In this study, structural, thermal, morphological, and optical properties of chitosan (CS) films functionalized with natural dyes extracted from discarded Bougainvillea bracts (DBG) were studied. The ¹H NMR and ¹³C NMR data were used to provide a thorough understanding of the chemical components of the extracted DBG dye. The DBG dye has functional groups, such as OH, NH, C = O, and C = C, as identified by FTIR analysis. Dye-doped CS films exhibited a diminished and broadened OH band, indicating hydrogen bonding. Glycerol was used as a plasticizer in order to prevent film brittleness. The green-synthesized CS-dye-doped films show enhanced optical characteristics with varying amounts of DBG dye. The optical energy band gap is assessed by analyzing the dielectric loss, while the kinds of electronic transitions in the films are identified using Tauc’s method. It shows that the energy gap decreases from 5.15 to 2.10 eV. This is ascribed to an improvement in the density of states. The XRD study shows a reduction in the amorphous phase; also, the Urbach energy values confirm an increase in crystallinity. Various optoelectronic parameters were studied at different concentrations of the dye. Furthermore, the TGA study indicates that the incorporation of the DBG enhances the thermal stability of CS. The optical characteristics investigation revealed that waste floral dyes (DBG) are an effective dopant for modifying the band structure of functional polymers, surpassing other typical fillers. Thermal examination through TGA established the impact of the dye on thermal stability.

研究了用废弃三角梅苞片（DBG）中提取的天然染料功能化壳聚糖（CS）膜的结构、热学、形态学和光学性能。利用1H NMR和13C NMR数据对提取的DBG染料的化学成分进行了全面的了解。经红外光谱分析，DBG染料具有OH、NH、C = O和C = C等官能团。染料掺杂的CS薄膜表现出OH带的减弱和加宽，表明氢键形成。为了防止薄膜脆性，使用甘油作为增塑剂。绿色合成的cs染料掺杂薄膜在加入不同数量的DBG染料后表现出增强的光学特性。通过分析介质损耗来评估光能带隙，并利用Tauc方法识别薄膜中的电子跃迁类型。结果表明，能隙从5.15 eV减小到2.10 eV。这是由于态密度的提高。XRD分析表明，非晶相减少；同时，厄巴赫能值也证实了结晶度的增加。在不同的染料浓度下，研究了不同的光电参数。此外，TGA研究表明，DBG的加入提高了CS的热稳定性。光学特性研究表明，废花染料（DBG）是修饰功能聚合物能带结构的有效掺杂剂，优于其他典型的填料。热热分析确定了染料对热稳定性的影响。

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引用次数: 0

Enhancing the structural, optical, and dielectric properties of GNP-reinforced PVC/PMMA polymer nanocomposites for capacitive energy storage applications 提高gnp增强聚氯乙烯/PMMA聚合物纳米复合材料的结构、光学和介电性能，用于电容储能应用

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2026-01-02 DOI: 10.1080/1023666X.2025.2547895

Abdullah F. Al Naim , A. A. Al-Muntaser

This study aims to enhance the dielectric and electrical properties of PVC/PMMA polymer blends by incorporating graphene nanoplatelets (GNPs) for potential use in energy storage devices. Nanocomposites were prepared via the solution casting method and characterized using various analytical techniques such as XRD, HR-TEM, FTIR, UV-Vis spectroscopy, dielectric measurements, AC conductivity, and impedance spectroscopy. X-ray diffraction (XRD) analysis revealed the emergence of a sharp crystalline peak at 2θ = 26.48°, corresponding to the (002) plane of GNPs, while the overall crystallinity of the polymer nanocomposites decreased due to disrupted polymer chain packing. HR-TEM imaging confirmed the layered morphology of GNPs, emphasizing 2D nanostructure with high surface area. FTIR spectroscopy indicated strong interfacial interactions, including π-π stacking and hydrogen bonding. UV-Vis. absorption spectra exhibited a redshift and increased intensity with higher GNP content, correlating with band gap narrowing due to charge carrier delocalization. Dielectric measurements demonstrated a remarkable increase in the dielectric constant (ε′), reaching 1.6 × 103 at 10 Hz for the 0.25 wt.% GNP composite, attributed to Maxwell-Wagner-Sillars polarization. AC conductivity analysis revealed a transition from insulating to conductive behavior with increasing GNP concentration, supported by impedance spectroscopy, which showed a reduction in bulk resistance. These findings highlight the potential of GNP-reinforced PVC/PMMA composites for capacitive energy storage applications.

本研究旨在通过加入石墨烯纳米片（GNPs）来提高PVC/PMMA聚合物共混物的介电性能和电性能，以用于储能设备。采用溶液浇铸法制备了纳米复合材料，并利用XRD、HR-TEM、FTIR、UV-Vis光谱、介电测量、交流电导率和阻抗谱等分析技术对其进行了表征。x射线衍射（XRD）分析表明，在2θ = 26.48°处出现了一个尖锐的结晶峰，对应于GNPs的（002）平面，而聚合物链的排列被打乱导致聚合物纳米复合材料的整体结晶度下降。HR-TEM成像证实了GNPs的层状形貌，强调具有高表面积的二维纳米结构。FTIR光谱分析表明，两者之间存在很强的界面相互作用，包括π-π堆积和氢键。紫外可见。随着GNP含量的增加，吸收光谱表现出红移和强度增加，这与电荷载流子离域引起的带隙缩小有关。介电测量表明介电常数（ε′）显著增加，在10 Hz时达到1.6 × 103。% GNP综合指数，归因于麦克斯韦-瓦格纳-西拉极化。交流电导率分析表明，随着GNP浓度的增加，材料的绝缘行为向导电行为转变，阻抗谱分析表明，材料的体电阻减小。这些发现突出了gnp增强PVC/PMMA复合材料在电容储能应用中的潜力。

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引用次数: 0

Study of the effect of electric field on the charge states of polypropylene doped with ZrO2 nanoparticles by the TSD method 用TSD法研究了电场对掺杂ZrO2纳米粒子的聚丙烯电荷态的影响

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2026-01-02 DOI: 10.1080/1023666X.2025.2531053

Hijran S. Ibrahimova , Tahir D. Ibragimov

Composites based on polypropylene and ZrO₂ nanoparticles (concentration of 3 vol.%), at which the highest electret properties are observed, are studied by the thermally stimulated depolarization (TSD) current method after treatment of electrostatic field with different intensities (5·10⁶ V/m,10⁷ V/m and 1.5·10⁷ V/m). The measurement of TSD currents revealed the presence of two main peaks in the spectra of the nanocomposite at 25–35 °C and 120–140 °C. They appear as a result of the destruction of one or another category of traps of injected charges. Calculations have shown that there is a monomolecular mechanism of charge recombination in these nanocomposites. It is shown that increasing the applied electric field leads to an increase in the intensity of the thermograms, reaching a maximum at 10⁷ V/m and then decreasing at 1.5·10⁷ V/m. The activation energy, the total accumulated charge, and the relaxation time have a similar behavior. It is due to the increase in injected charges. The formation of an internal electric field prevents this process when the external electric field intensity is higher.

聚丙烯与ZrO2纳米颗粒复合材料（浓度为3 vol）。在5·106 V/m、107 V/m和1.5·107 V/m等不同强度的静电场作用下，采用热激退极化（TSD）电流法研究了在该条件下观察到最高驻极体性能的材料。TSD电流测量结果显示，在25-35℃和120-140℃时，纳米复合材料的光谱中存在两个主峰。它们是由于一种或另一种注入炸药的陷阱被破坏而出现的。计算表明，在这些纳米复合材料中存在单分子电荷重组机制。结果表明，随着外加电场的增大，热图强度增大，在107 V/m时达到最大值，在1.5·107 V/m时减小。活化能、总累积电荷和弛豫时间具有相似的特性。这是由于注入药量的增加。当外部电场强度较高时，内部电场的形成阻止了这一过程。

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引用次数: 0

Microwave resonant probe-based nondestructive detection of cold weld defects in HDPE pipe butt fusion joints 基于微波共振探头的HDPE管对接熔接冷焊缺陷无损检测

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2026-01-02 DOI: 10.1080/1023666X.2025.2547902

Jinping Pan , Zhen Wang , Chaoming Zhu , Lianjiang Tan

This study investigates the detection of cold weld defects in high-density polyethylene (HDPE) pipe butt fusion joints using a microwave resonant probe integrated with a vector network analyzer (VNA). Cold weld defects, caused by insufficient heating or fusion pressure during the welding process, compromise the mechanical integrity of HDPE joints and threaten the safety of gas networks. The proposed microwave nondestructive testing (NDT) system converts the material’s effects on antenna radiation into changes in the resonant cavity’s parameters, providing high detection sensitivity. Variations in fusion temperature (170–220 °C) and pressure (0.47–0.78 MPa) lead to distinct responses of a resonance curve, i.e., changes in the S₂₁ magnitude of the resonance peak. Tensile tests, true density analysis, and X-ray diffraction (XRD) further confirm that cold weld defects degrade the mechanical properties, reduce structural compactness, and lower crystallinity of the joints. This study highlights that microwave detection is a reliable and efficient method for identifying cold weld defects and evaluating joint quality, offering a practical solution for HDPE pipeline integrity assessment.

本研究利用集成矢量网络分析仪（VNA）的微波谐振探头对高密度聚乙烯（HDPE）管道对接熔接接头的冷焊接缺陷进行检测。在焊接过程中，由于加热压力或熔合压力不足而产生的冷焊缺陷损害了HDPE接头的机械完整性，威胁到燃气管网的安全。提出的微波无损检测系统将材料对天线辐射的影响转化为谐振腔参数的变化，具有较高的检测灵敏度。熔合温度（170 ~ 220℃）和熔合压力（0.47 ~ 0.78 MPa）的变化导致了共振曲线的不同响应，即共振峰的S21量级发生了变化。拉伸试验、真密度分析和x射线衍射（XRD）进一步证实，冷焊缺陷降低了接头的力学性能，降低了组织致密性，降低了结晶度。研究表明，微波检测是一种可靠、高效的冷焊缝缺陷识别和接头质量评价方法，为HDPE管道完整性评价提供了实用的解决方案。

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引用次数: 0

Development of PCL/cellulose acetate blended membranes and modified with Libidibia ferrea extract PCL/醋酸纤维素共混膜及其铁酸Libidibia提取物改性的研制

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2026-01-02 DOI: 10.1080/1023666X.2025.2546926

Wanderleia Monteiro de Souza , Taisa Lorene Sampaio Farias , Ariamna María Dip Gandarilla , Jéssica Feitosa Cunha , Tatiane Pereira de Souza , Walter Ricardo Brito , Carina Toda , Nikeila Chacon de Oliveira Conde

This study aimed to develop and characterize polycaprolactone (PCL) membranes modified with Libidibia ferrea L. (Jucá) extract and cellulose acetate (CA) for potential dental applications. Four groups of membranes were fabricated using the electrospinning technique: PCL, PCL+CA, PCL+Jucá, and PCL+CA+Jucá. The surface morphology of the membranes was examined using scanning electron microscopy (SEM), and the surface wettability was assessed to determine whether the membranes were hydrophobic or hydrophilic. The in vitro release of the Jucá extract from the membranes was quantified using ultraviolet-visible (UV-Vis) spectrophotometry. The release of bioactive compounds from the PCL+Jucá system was monitored in the 200–500 nm range, with absorbance at 211 nm. The data were fitted to classical release models when the Korsmeyer-Peppas model provided the best fit (R² = 0.974), and the release exponent (n = 0.213) suggested a Fickian diffusion-controlled mechanism. Shapiro-Wilk tests confirmed normal data distribution for morphological analysis, which was further evaluated using ANOVA and Tukey’s post-hoc test (significance 5%). The mean fiber diameter (MD) was found to be 1.40 ± 0.55 μm for PCL and 1.23 ± 0.59 μm for PCL+Jucá, showing no statistically significant difference (p < 0.001). In comparison, PCL+CA membranes had an MD of 0.94 ± 0.34 μm, while the PCL+CA+Jucá had an MD of 1.65 ± 1.05 μm, indicating significant differences compared to the PCL and PCL+Jucá groups (p < 0.001). The addition of Jucá and CA altered surface characteristics, notably reducing the contact angle and enhancing hydrophilicity. PCL+Jucá membrane was the only one that demonstrated a controlled release profile in the release study. Among all tested formulations, the PCL+Jucá membranes displayed the most promising results, suggesting strong potential for use as drug delivery systems in oral health applications.

本研究旨在开发和表征用Libidibia ferrea L. （jurea）提取物和醋酸纤维素（CA）修饰的聚己内酯（PCL）膜，用于潜在的牙科应用。采用静电纺丝技术制备了四组膜：PCL、PCL+CA、PCL+聚脲和PCL+CA+聚脲。利用扫描电子显微镜（SEM）检查了膜的表面形态，并评估了表面润湿性，以确定膜是疏水还是亲水。采用紫外-可见分光光度法定量测定膜中枣提取物的体外释放量。在200-500 nm范围内监测PCL+ juc 体系中生物活性化合物的释放，吸光度为211 nm。其中，Korsmeyer-Peppas释放模型拟合最佳（R2 = 0.974），释放指数（n = 0.213）为Fickian扩散控制机制。夏皮罗-威尔克检验证实形态分析数据呈正态分布，进一步采用方差分析和Tukey事后检验（显著性5%）进行评估。PCL的平均纤维直径（MD）为1.40±0.55 μm， PCL+ juc的平均纤维直径（MD）为1.23±0.59 μm，差异无统计学意义（p < 0.001）。PCL+CA膜的MD为0.94±0.34 μm, PCL+CA+ juuc膜的MD为1.65±1.05 μm，与PCL和PCL+ juuc组比较差异有统计学意义（p < 0.001）。聚乳酸和CA的加入改变了表面特性，显著降低了接触角，增强了亲水性。在释放研究中，PCL+ juc膜是唯一一种显示出控释谱的膜。在所有测试的配方中，PCL+聚脲膜显示出最有希望的结果，表明在口腔健康应用中作为药物输送系统的巨大潜力。

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引用次数: 0

On percolation model for elastomeric porous thin films 弹性体多孔薄膜的渗流模型

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2026-01-02 DOI: 10.1080/1023666X.2025.2527180

Swati A. Sonawane , Ravindra D. Kulkarni , Tushar D. Deshpande

We have correlated rheological properties with porosity for elastomeric porous PDMS thin films following percolation theory. Elastomeric porous PDMS thin films (EPTfs) were fabricated using water as the porogen and subsequently characterized for their surface and bulk pore morphologies by FESEM; estimation of their relative crosslinking extent was performed by infrared (FTIR), and toluene absorptions (swelling index) and thermal stability (TGA analysis). FTIR and toluene absorptions both exhibited increments in the hydrosilyl group (Si-H) conversion to Si-CH₂-CH₂- linkage with increasing porogen addition. TGA analysis showed a slight decrease in thermal stabilities of EPTfs as compared to non-porous PDMS film. Tracking the rheological analysis, the storage factor (ratio of the storage modulus to the loss modulus) of polydimethylsiloxane (PDMS)-based elastomeric porous thin films (EPT films) is related to the porosity of the films. The percolation theory was found to correlate well with the storage factor

(\frac{G^{'}}{G”})

and porosity dependence of PDMS-based EPT films in the porosity range of 0.347–0.560.

根据渗流理论，我们将弹性多孔PDMS薄膜的流变性能与孔隙率联系起来。以水为成孔剂制备弹性多孔PDMS薄膜（EPTfs），并用FESEM对其表面和体孔形貌进行表征；通过红外光谱（FTIR）、甲苯吸收率（溶胀指数）和热稳定性（TGA）分析来估计它们的相对交联程度。FTIR和甲苯吸收均显示，随着孔隙素添加量的增加，硅氢基（Si-H）转化为Si-CH2-CH2-键的量增加。TGA分析表明，与无孔PDMS膜相比，EPTfs的热稳定性略有下降。根据流变学分析，聚二甲基硅氧烷（PDMS）基弹性多孔薄膜（EPT薄膜）的存储系数（存储模量与损耗模量之比）与薄膜的孔隙率有关。在0.347 ~ 0.560孔隙度范围内，pdm基EPT薄膜的储层系数（G 'G '）和孔隙度依赖性与渗流理论具有良好的相关性。

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引用次数: 0

Influence of irradiation on modifying the surface wettability and optical characteristics of flexible polymer composite films for optoelectronic devices 辐照对光电器件用柔性聚合物复合薄膜表面润湿性和光学特性的影响

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2026-01-02 DOI: 10.1080/1023666X.2025.2544861

A. Atta , Reem Altuijri , Nuha Al-Harbi , A. M. Abdel Reheem

In this work, the nanocomposite (PVA/NaI), which consists of polyvinyl alcohol (PVA) and sodium iodide particles (NaI) was prepared using the solution casting method for application in optoelectronic devices. The PVA/NaI samples were subjected to nitrogen plasma with varying durations of 15 to 30, 45, and 60 min. The samples were analyzed using the EDX and FTIR methods. The data of the EDX confirmed the successful preparation of the PVA/NaI composites. The optical properties were investigated using the Wemple and Di-Domenico method. The optical absorption edge has decreased from 2.76 eV for PVA/NaI to 2.72, 2.67, 2.65, and 2.61 eV, respectively, for samples subjected to 15, 30, 45, and 60 min. In addition, the band gap decreased from 3.02 eV to 3.0, 2.96, 2.94, and 2.92 eV, respectively. Moreover, the contact angle, the adhesion work, and the surface free energy were determined for the pure and irradiated PVA/NaI composite. The water contact angle drops from 77.34° for PVA/NaI to 42.52° when the duration time is raised to 60 min, but the adhesion work goes up from 87.90 mJ/m² to 125.32 mJ/m². The use of plasma as a non-chemical, clean method for modifying the optical and structural properties of samples is the novelty of this work. According to the findings, the irradiated films have more potential for usage in optoelectronics.

本文采用溶液浇铸法制备了聚乙烯醇（PVA）和碘化钠颗粒（NaI）的纳米复合材料（PVA/NaI），并将其应用于光电子器件。将PVA/NaI样品置于氮气等离子体中，持续时间分别为15至30、45和60分钟。用EDX和FTIR方法对样品进行分析。EDX的数据证实了PVA/NaI复合材料的成功制备。用Wemple和Di-Domenico方法研究了其光学性质。PVA/NaI的光吸收边分别从2.76 eV降低到2.72、2.67、2.65和2.61 eV，分别为15、30、45和60 min。带隙从3.02 eV减小到3.0、2.96、2.94和2.92 eV。测定了纯PVA/NaI复合材料的接触角、附着功和表面自由能。当持续时间延长至60 min时，PVA/NaI的水接触角从77.34°下降到42.52°，而附着功从87.90 mJ/m2增加到125.32 mJ/m2。使用等离子体作为一种非化学、清洁的方法来修饰样品的光学和结构特性是这项工作的新颖之处。根据研究结果，辐照膜在光电子学方面具有更大的应用潜力。

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引用次数: 0

The electrical properties of NH4SCN (ammonium thiocyanate) ion in combination with natural gum rosin and cellulose acetate blend for solid polymer electrolyte 研究了硫氰酸铵（NH4SCN）离子与天然松香和醋酸纤维素共混为固体聚合物电解质的电学性能

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2026-01-02 DOI: 10.1080/1023666X.2025.2531052

Murugan R. , Kannan S. , Karthikeyan S. , Venkatesh K. , Jenova I.

Solid polymer electrolytes (SPEs) are greatly favored over liquid electrolytes in electrochemical cells because of their benefits, which include low flammability, ease of production, flexibility, leak-proofness, and interface compatibility. Improving ionic conductivity and electrode-electrolyte compatibility are the primary concerns of the polymer electrolytes used in solid-state batteries. This study focuses on optimizing the concentration of ammonium thiocyanate to achieve maximum ionic (proton) conductivity within the prepared polymer medium of cellulose acetate mixed with rosin gum. The synthesized electrolyte films were systematically tailored and evaluated for their electrochemical suitability in battery applications. The highest ionic conductivity of 7.39 × 10⁻⁴ S cm⁻¹ was achieved for the composition containing rosin gum (1.4 g), cellulose acetate (0.6 g), and ammonium thiocyanate (0.4 g). In addition to the ion-conductivity studies of the prepared electrolytes with different dopant-salt concentrations, their structural, thermal, and electrochemical characterizations have also been carried out. The amorphous nature of the synthesized films and the salt’s dissolution in the polymer matrix were shown by the X-ray diffraction patterns. The complexation of salt with the polymer-gum blend network has been verified by FTIR spectroscopy. Linear sweep voltammetry (LSV) of the synthesized electrolyte showed electrochemical stability up to 2.0 V. Thermogravimetry analysis verified that the SPE membrane remained stable at temperatures up to 200 °C. Using a variety of resistive loads, discharge characteristics for the highest conductive membrane have been studied.

在电化学电池中，固体聚合物电解质（spe）比液体电解质更受青睐，因为它们具有低可燃性、易于生产、柔韧性、防泄漏和界面兼容性等优点。提高离子电导率和电极-电解质相容性是用于固态电池的聚合物电解质的主要关注点。本研究的重点是优化硫氰酸铵的浓度，使其在制备的醋酸纤维素与松香胶混合的聚合物介质中获得最大的离子（质子）电导率。系统地定制了合成的电解质薄膜，并评估了它们在电池应用中的电化学适用性。在含有松香胶（1.4 g）、醋酸纤维素（0.6 g）和硫氰酸铵（0.4 g）的组合物中，离子电导率最高，为7.39 × 10−4 S cm−1。除了对不同掺杂盐浓度制备的电解质进行离子电导率研究外，还对其进行了结构、热学和电化学表征。x射线衍射图显示了合成膜的无定形性质和盐在聚合物基体中的溶解。用红外光谱验证了盐与聚合物-胶共混网络的络合作用。合成电解质的线性扫描伏安（LSV）测试结果表明，其电化学稳定性可达2.0 V。热重分析证实，SPE膜在高达200°C的温度下保持稳定。在各种电阻性负载下，研究了最高导电膜的放电特性。

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引用次数: 0

Esterified guar gum: synthesis, characterization, and evaluation as excipient for mouth dissolving tablets 酯化瓜尔胶：合成、表征及作为口腔溶解片剂辅料的评价

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2025-10-18 DOI: 10.1080/1023666X.2025.2561954

Rashmi Sharma , Vikramjeet Singh , Munish Ahuja

The present study focuses on the modification of guar gum using 2-Dodecen-1-yl succinic anhydride through a nucleophilic substitution reaction in an aqueous basic medium. The successful modification of guar gum was confirmed using spectral characterizations. The degree of substitution was determined to be 0.23. Modified guar gum was thermally more stable. Morphological analysis showed the presence of agglomerates on the surface of the modified guar gum. The viscosity of the modified guar gum was significantly reduced, while its molecular weight increased. Cytotoxicity studies revealed that native and modified guar gum are non-cytotoxic. The modification process also terminated the swelling property of guar gum, leading to rapid dispersion in water. Based on these findings, mouth-dissolving tablets of modified guar gum were prepared using metoclopramide as a model drug. For comparison, tablets incorporating disintegrants like croscarmellose sodium and sodium starch glycolate were also formulated. In vitro release studies demonstrated that within 5 min, all batches of tablets released more than 95% of the drug in phosphate buffer (pH 6.8). The drug release pattern of modified gum tablets and the marketed formulation was similar. In conclusion, the esterified guar gum demonstrates potential as an effective pharmaceutical excipient for fast-dissolving tablet formulations.

研究了以2-十二-1-基丁二酸酐为原料，在碱性水溶液中进行亲核取代反应对瓜尔胶进行改性。通过光谱表征证实了瓜尔胶改性的成功。替代度确定为0.23。改性瓜尔胶的热稳定性更好。形态学分析表明，改性瓜尔胶表面存在团块。改性后的瓜尔胶粘度明显降低，分子量增加。细胞毒性研究表明，原生瓜尔胶和改性瓜尔胶均无细胞毒性。改性过程还终止了瓜尔胶的膨胀特性，导致其在水中迅速分散。在此基础上，以甲氧氯普胺为模型药物制备了改性瓜尔胶口腔溶片。为了比较，还配制了含有交联棉糖钠和淀粉乙醇酸钠等崩解剂的片剂。体外释放研究表明，在5分钟内，所有批次的片剂在磷酸盐缓冲液（pH 6.8）中释放95%以上的药物。改良口香糖片的释药规律与市售制剂相似。综上所述，酯化瓜尔胶有潜力作为一种有效的药物赋形剂用于速溶片剂配方。

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引用次数: 0

Fast and energy efficient crosslinking of PVA to make water resistant coating using glutaraldehyde 戊二醛用于聚乙烯醇快速高效交联制备防水涂料

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2025-10-03 DOI: 10.1080/1023666X.2025.2504562

Shyambabu K. Sainik , Prasanta K. Panda , T.V. Sreekumar

Glutaraldehyde has recently drawn attention as a crosslinking agent for PVA due to its ability to facilitate reactions under ambient conditions. The study focused on comparing the effects of glutaraldehyde, formaldehyde, and glyoxal as crosslinking agents for PVA under similar conditions, using different aldehyde-to-PVA ratios (0.2, 0.4, 0.6, 0.8, and 1.0). The crosslinking reaction was conducted at 50 °C for a duration of 5 min, to assess the efficiency of crosslinking agents at milder conditions. Initial evaluations focused on determining the water swelling degree, the degree of crosslinking, and moisture uptake of the prepared films under humid conditions. Results demonstrated a high degree of crosslinking: with glutaraldehyde at GA/PVA ratios of 0.6 and 0.8, crosslinking reached 99%. Formaldehyde achieved a crosslinking degree of 97% at an FA/PVA ratio of 0.8, while glyoxal reached 90% at a ratio of 0.2. Among the aldehydes tested, glutaraldehyde exhibited the highest crosslinking efficiency under similar conditions, making it the preferred crosslinker for further characterization studies. FTIR, TGA, and XRD spectra confirmed successful crosslinking between GA and PVA, evidenced by acetal bond formation and changes in the diffraction patterns correlating with increased amorphous character in the PVA films.

戊二醛作为聚乙烯醇的交联剂，由于其在环境条件下促进反应的能力，最近引起了人们的关注。本研究的重点是比较戊二醛、甲醛和乙二醛作为交联剂在相似条件下，使用不同的醛与PVA的比例（0.2、0.4、0.6、0.8和1.0）对PVA的影响。交联反应在50℃下进行，持续时间为5分钟，以评估交联剂在温和条件下的效率。初步评价的重点是确定在潮湿条件下制备的薄膜的水膨胀度、交联度和吸湿性。结果表明，在GA/PVA比为0.6和0.8时，戊二醛的交联度达到99%。当FA/PVA比为0.8时，甲醛的交联度为97%，当FA/PVA比为0.2时，乙二醛的交联度为90%。在测试的醛类中，戊二醛在相似的条件下表现出最高的交联效率，使其成为进一步表征研究的首选交联剂。FTIR， TGA和XRD光谱证实了GA和PVA之间成功的交联，证明了缩醛键的形成和PVA薄膜中无定形特性增加相关的衍射图的变化。

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引用次数: 0