Polymer Testing最新文献_第2页

High-throughput micro-indentation method for temperature-dependent static and dynamic characterization of structural adhesives 高通量微压痕法测定结构胶粘剂的静态和动态特性

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2026-01-08 DOI: 10.1016/j.polymertesting.2026.109093

Chao Kang , Yoichi Okamoto , Ming Ji , Keiyu Ikeda , Yu Sekiguchi , Masanobu Naito , Chiaki Sato

Characterizing the temperature-dependent mechanical properties of structural adhesives is critical for industrial applications in aerospace, automotive, and electronics. The increasing integration of artificial intelligence (AI) in material discovery has amplified the demand for large, high-quality datasets, which conventional mechanical testing methods often cannot efficiently provide. In this study, a novel micro-indentation method is introduced that enables rapid and accurate evaluation of static and dynamic mechanical properties of structural adhesives across a wide temperature range. A 3-mm spherical indenter is utilized to perform both quasi-static and dynamic loading on flat bulk samples, enabling accurate multi-modal measurement through independent and precise temperature control of both the indenter and the bulk material, thereby ensuring reliable measurements with minimal sample preparation. Static indentation tests on epoxy and acrylic samples demonstrated that the elastic modulus can be accurately obtained from unloading data, even with plastic deformation, using the Oliver–Pharr method. Dynamic testing further revealed that the epoxy exhibited higher storage and loss moduli than the acrylic adhesive, indicating superior mechanical performance at elevated temperatures. Conversely, the acrylic adhesive exhibited a lower glass transition temperature, indicating a narrower operational temperature range, and a higher loss factor, reflecting greater energy dissipation. The proposed method enhances the efficiency and accuracy of mechanical characterization, enabling the high-throughput testing necessary to generate datasets for AI-driven material development. By enabling rapid design and optimization of polymers, this technique is promising for advancing material discovery with tailored properties.

表征结构粘合剂的温度相关机械性能对于航空航天、汽车和电子等工业应用至关重要。人工智能（AI）在材料发现中的日益融合，扩大了对大型、高质量数据集的需求，而传统的机械测试方法往往无法有效地提供这些数据集。在这项研究中，介绍了一种新的微压痕方法，可以快速准确地评估结构粘合剂在宽温度范围内的静态和动态力学性能。利用一个3毫米的球形压头对平面散装样品进行准静态和动态加载，通过对压头和散装材料进行独立和精确的温度控制，实现精确的多模态测量，从而确保以最少的样品制备进行可靠的测量。对环氧树脂和丙烯酸样品的静态压痕试验表明，使用oliver - farr方法可以准确地从卸载数据中获得弹性模量，即使有塑性变形。动态测试进一步表明，环氧树脂比丙烯酸树脂具有更高的储存模量和损耗模量，表明在高温下具有更好的机械性能。相反，丙烯酸胶粘剂的玻璃化转变温度较低，表明工作温度范围较窄，损耗因子较高，反映出更大的能量耗散。所提出的方法提高了机械表征的效率和准确性，实现了为人工智能驱动的材料开发生成数据集所需的高通量测试。通过实现聚合物的快速设计和优化，该技术有望推进具有定制特性的材料发现。

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引用次数: 0

Insight into kinetic and diffusion phenomena in solvent-free poly(hydroxy-urethane) synthesis through applied step-growth modeling 通过应用阶梯生长模型深入了解无溶剂聚羟基聚氨酯合成过程中的动力学和扩散现象

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2026-01-02 DOI: 10.1016/j.polymertesting.2026.109084

Weronika Małgorzata Milanowska , Aleksandra Marta Fage , Felix Brabender , Ulrich Förter-Barth , Subrajeet Deshmukh , Sergio Lucia , Robert Brüll , Dominik Wołosz , Paweł Grzegorz Parzuchowski

Understanding the factors which determine the course of solvent-free cyclic carbonate aminolysis is critical for advancing the development of poly(hydroxy-urethane) (PHU) systems as sustainable alternatives to conventional, isocyanate-derived materials. In this work, we present an empirical model supporting the study of temperature- and conversion-dependent phenomena that influence PHU formation from oligomeric poly(propylene glycol)-based bis(cyclic carbonate) and short-chain 4,7,10-trioxa-1,13-tridecanediamine. For this purpose, the uncatalyzed synthesis experiments were conducted at 80–140 °C in a plate-plate rheometer, continuously monitoring the reaction in a melt through real-time viscosity measurements. Subsequent spectroscopic characterization verified that the dynamic rheological response can be ascribed to the formation of PHU materials free of side products. The resulting dataset was linked to molar mass evolution through a supplementary viscosity model and used to parameterize a step-growth polymerization model for cyclic carbonate aminolysis, integrating both mixing limitations at early stages and subsequent mass transfer phenomena. The model accurately reproduced experimental data in the low-temperature regime, demonstrating that linear step-growth with diffusion limitation adequately describes the reaction under given conditions and allows identification of physical effects causing deviations in predictions at elevated temperatures. These results highlight that, beyond reaction kinetics, diffusion phenomena critically shape PHU polymerization behavior, determining temporal chain extension progress. Consequently, the proposed modeling framework enables the deconvolution of distinct reaction regimes, providing crucial insight for optimizing PHU synthesis.

了解决定无溶剂环碳酸酯氨解过程的因素对于推进聚（羟基-氨基甲酸酯）（PHU）体系作为传统异氰酸酯衍生材料的可持续替代品的发展至关重要。在这项工作中，我们提出了一个经验模型，支持温度和转化依赖现象的研究，这些现象影响聚（丙二醇）基双（环碳酸酯）和短链4,7,10-三氧-1,13-三胺形成PHU。为此，非催化合成实验在80-140°C的板-板流变仪中进行，通过实时粘度测量连续监测熔体中的反应。随后的光谱表征证实，动态流变响应可以归因于PHU材料的形成，没有副产物。结果数据集通过补充粘度模型与摩尔质量演化相关联，并用于参数化环碳酸盐氨解的阶梯生长聚合模型，整合了早期阶段的混合限制和随后的传质现象。该模型准确地再现了低温条件下的实验数据，表明具有扩散限制的线性阶跃增长充分描述了给定条件下的反应，并允许识别在高温下导致预测偏差的物理效应。这些结果强调，除了反应动力学之外，扩散现象对PHU聚合行为的影响至关重要，决定了时间链延伸的进展。因此，所提出的建模框架能够实现不同反应体系的反卷积，为优化PHU合成提供关键的见解。

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引用次数: 0

Pseudocapacitive behavior of 2D molybdenum titanium carbide MXene and polyaniline based nanocomposites electrodes 二维碳化钼钛MXene和聚苯胺基纳米复合材料电极的赝电容行为

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2026-01-01 DOI: 10.1016/j.polymertesting.2025.109079

Waqas Khalid , Ahmed N.M. Alahmadi , Mehran Saeed , Muhammad I. Masud , Shumaila Karamat , Muhammad Kashif , Sajid Khan

The synergetic effect of conducting polymer and MXenes-based electrodes can pave the way to achieve high specific capacitance, power density, and stability in supercapacitors. This work is a step towards the search for a new pseudocapacitive electrode material for high-performance supercapacitors, where double transition metal carbide (Mo₂Ti₂C₃T_x) MXene is combined with polyaniline (PANI). A binary composite of Mo₂Ti₂C₃T_x and PANI was synthesized using an ex-situ oxidative polymerization technique. Structural, morphological, and compositional characterizations were performed using XRD, FESEM, EDX, and XPS, confirming successful composite formation. The electrochemical properties of the electrode material were analyzed using cyclic voltametry(CV), galvanostatic charge-discharge (GCD) measurements, and electrochemical impedance spectroscopy (EIS). The Mo₂Ti₂C₃T_x/PANI composite exhibited a high specific capacitance (C_SP) of 908.1 F g⁻¹ at 1 Ag^-1, with an enhanced energy density of 45.4 Whkg⁻¹ and power density of 300 W kg⁻¹, significantly outperforming pristine MXene. The Mo₂Ti₂C₃T_x/PANI composite demonstrated 80.2 % capacitance retention up to 3000 cycles. The electrochemical study indicates that the synergistic blend of Mo₂Ti₂C₃T_x and PANI improves the charge transport and storage properties, making the nanocomposite an attractive choice for a supercapacitor electrode material.

导电聚合物与mxenes电极的协同效应为超级电容器实现高比电容、功率密度和稳定性铺平了道路。这项工作是为高性能超级电容器寻找一种新的假电容电极材料的一步，其中双过渡金属碳化物（Mo2Ti2C3Tx） MXene与聚苯胺（PANI）结合。采用原位氧化聚合技术合成了Mo2Ti2C3Tx和聚苯胺二元复合材料。利用XRD、FESEM、EDX和XPS进行了结构、形态和成分表征，证实了复合材料的成功形成。采用循环伏安法（CV）、恒流充放电法（GCD）和电化学阻抗谱法（EIS）分析了电极材料的电化学性能。Mo2Ti2C3Tx/PANI复合材料在1 Ag-1时具有908.1 F g−1的高比电容（CSP），增强的能量密度为45.4 Whkg−1，功率密度为300 W kg−1，显著优于原始MXene。Mo2Ti2C3Tx/PANI复合材料在3000次循环内的电容保持率为80.2%。电化学研究表明，Mo2Ti2C3Tx和PANI的协同共混改善了电荷传输和存储性能，使纳米复合材料成为超级电容器电极材料的一个有吸引力的选择。

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引用次数: 0

Corrigendum to “A highly transparent and self-healing elastomer based on dynamically reversible heterocyclic interactions with enhanced toughness and outstanding rolling reliability” [Polymer Testing 147 (2025) 108803] “一种基于动态可逆杂环相互作用的高透明自愈弹性体，具有增强的韧性和出色的滚动可靠性”[聚合物测试147(2025)108803]的勘误表

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2026-01-01 DOI: 10.1016/j.polymertesting.2025.109077

Kiwon Choi , Hyeryeon Jeon , Youngmin Kim , Yongju Kim , Pyong Hwa Hong , Jong Hyuk Park , Min Jae Ko , Sung Woo Hong

引用次数: 0

Impact response of dynamic coupling between aramid fabric mesoscopic model and soft tissue 芳纶织物细观模型与软组织动态耦合的冲击响应

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2026-01-01 DOI: 10.1016/j.polymertesting.2025.109081

Dihua Ouyang , Zhe Li , Qiantao Zhang , Yuhan Liu , Jiazheng Pan , Song Wang , Xingyu Liu

As a core equipment for anti-riot law enforcement, non-lethal kinetic energy projectiles do not cause penetrating injuries due to their blunt impact effect, but they tend to transfer kinetic energy to induce severe concave damage to human abdominal soft tissues, and even endanger the safety of internal organs. Aiming at the limitation in existing studies where the mesoscopic structure of fabrics and the dynamic response of human soft tissues are analyzed in isolation, this study innovatively constructs a dynamic coupling system of “3D mesoscopic yarn model - skin-fat-muscle layered biomechanical model”. For the first time in the research on blunt impact of non-lethal kinetic energy projectiles, it realizes the collaborative simulation of yarn interlacing effect and the biomechanical properties of soft tissues. Impact process simulations were carried out via LS-DYNA, which revealed the dual protective mechanisms of single-layer aramid fabric (“energy absorption + stress diffusion”) and the layered collaborative response law of soft tissues (“transmission - buffering - dispersion”), effectively controlling the degree of impact damage. This coupled model overcomes the simplification defects of traditional flat fabric models, fills the research gap in the coupling mechanism between mesoscopic yarns and soft tissues in the field of non-lethal kinetic energy projectile protection, and accurately captures the mesoscopic-macroscopic correlation of “yarn slippage - energy transmission - soft tissue response”. It provides a core modeling method for the optimal design of protective systems.

非致命动能弹丸作为防暴执法的核心装备，由于其冲击力较钝，不会造成穿透性伤害，但容易传递动能，对人体腹部软组织造成严重的凹伤，甚至危及内脏器官的安全。针对现有研究将织物的细观结构与人体软组织的动态响应孤立分析的局限性，本研究创新性地构建了“三维细观纱线模型-皮肤-脂肪-肌肉分层生物力学模型”的动态耦合系统。在非致命动能弹丸钝冲击研究中，首次实现了纱线交织效应与软组织生物力学性能的协同模拟。通过LS-DYNA进行冲击过程仿真，揭示了单层芳纶织物的双重保护机制（“能量吸收+应力扩散”）和软组织的分层协同响应规律（“传递-缓冲-分散”），有效控制了冲击损伤程度。该耦合模型克服了传统平面织物模型简单化的缺陷，填补了非致死动能弹丸防护领域中细观纱线与软组织耦合机理的研究空白，准确捕捉了“纱线滑移-能量传递-软组织响应”的细观-宏观关联。为保护系统的优化设计提供了一种核心建模方法。

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引用次数: 0

Modeling product inhibition in enzymatic degradation of Polylactic Acid (PLA) 模拟产物对聚乳酸（PLA）酶降解的抑制作用

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2026-01-01 DOI: 10.1016/j.polymertesting.2025.109074

Nanshin Nansak , Leo Creedon , Denis O’Mahoney , Ramen Ghosh , Marion McAfee

Bioresorbable polymers are widely used as temporary medical implants due to their biocompatibility, mechanical properties, and suitability as drug delivery systems. In some settings, in vivo degradation is enzyme-driven. It has been shown in vitro that accumulated degradation products can inhibit enzyme activity and slow subsequent degradation. We present a mechanistic model that extends the classical Michaelis–Menten kinetics to include reversible product inhibition. Calibrated to in vitro poly(lactic acid) degraded by Proteinase K with a mid-experiment buffer refresh, the model reproduces the observed biphasic mass-loss pattern and significantly outperforms a no-inhibition variant in terms of residual sum of squares and Bayesian Information Criterion. All five kinetic parameters were identified with high confidence using only eight mass-loss measurements from a 15-day experiment, and the model was validated against an independent dataset under two distinct buffer-change protocols without further parameter adjustment. Time-dependent Sobol sensitivity analysis shows that the catalytic and inhibition rate constants dominate degradation dynamics. Finally, we propose an extended formulation for in vivo conditions that introduces enzyme replenishment and product clearance terms to capture physiological processes. This framework provides a basis for predicting degradation kinetics in bioresorbable devices and motivates further in vivo studies on the build-up and clearance of acidic products under physiological conditions, given their critical role in bioresorption and drug delivery performance.

生物可吸收聚合物由于其生物相容性、机械性能和作为药物输送系统的适用性而被广泛用作临时医疗植入物。在某些情况下，体内降解是由酶驱动的。体外实验表明，累积的降解产物可以抑制酶活性并减缓随后的降解。我们提出了一个机制模型，扩展了经典的Michaelis-Menten动力学，包括可逆产物抑制。校准到被蛋白酶K降解的体外聚乳酸，实验中期缓冲刷新，该模型再现了观察到的双相质量损失模式，并在残差平方和和贝叶斯信息准则方面显著优于无抑制变体。在为期15天的实验中，仅使用8个质量损失测量值就可以高可信度地确定所有五个动力学参数，并且在两种不同的缓冲变化协议下，针对独立数据集验证了该模型，而无需进一步调整参数。随时间变化的Sobol敏感性分析表明，催化速率常数和抑制速率常数主导降解动力学。最后，我们提出了一个体内条件的扩展公式，引入酶补充和产品清除术语来捕捉生理过程。该框架为预测生物可吸收装置的降解动力学提供了基础，并激发了生理条件下酸性产物的积累和清除的进一步体内研究，因为它们在生物吸收和药物传递性能中起着关键作用。

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引用次数: 0

Demineralized bone bioinks with enhanced odontogenic differentiation: Synthesis and characterization 具有增强牙源性分化的脱矿骨生物墨水：合成和表征

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2026-01-01 DOI: 10.1016/j.polymertesting.2025.109082

Sudarshini Nath , Heesun Hong , Ji-Hyun Jang , Moon Sik Oh , Sol Kim , Ok Joo Lee , Ji Seung Lee , Kyunghee Kim , Chul Hee Lee , Ki Hyun Kim , Yusang Son , Chan Hum Park , Soon Hee Kim

We developed a photocrosslinkable hydrogel, DbpGMA, by chemically functionalizing demineralized bone powder (DBP) with glycidyl methacrylate (GMA). Bone particles smaller than 90 μm effectively preserved the collagenous matrix after demineralization, producing a uniform DBP sol with good processability. GMA modification was more efficient in HCl-based DBP sol than in acetic acid-based sol, resulting in a higher degree of methacrylation.

The DbpGMA hydrogels exhibited tunable mechanical and rheological properties depending on polymer concentration and UV exposure. Notably, increasing the concentration from 10 % to 30 % markedly reduced the gelation time from 130 s to 10 s, while extending the UV curing duration from 0 s to 10 s resulted in a substantial reduction in internal pore size from >75 μm to <12 μm. Among the tested formulations, 20 % DbpGMA provided an optimal balance between mechanical strength (compressive modulus of 150.3 ± 12.2 kPa at 10 % strain) and DLP print fidelity. Additionally, incorporating 0.1 % (w/v) tartrazine as a photoabsorber significantly improved shape fidelity by controlling light penetration, which facilitated the printing of delicate vascular channels with a 0.7 mm resolution.

DbpGMA demonstrated excellent cytocompatibility, supporting the proliferation and odontogenic differentiation of dental pulp stem cells (DPSCs) even in the absence of external inducers. The combination of natural bone-derived extracellular matrix composition, photocurability, and high print resolution highlights the versatility of DbpGMA as a DLP bioink. Overall, DbpGMA represents a biologically functional and DLP-compatible platform for fabricating high-resolution, cell-laden constructs, offering significant potential for dentin-pulp regeneration and dental hard tissue engineering.

我们用甲基丙烯酸缩水甘油酯（GMA）对脱矿骨粉（DBP）进行化学功能化，制备了一种可光交联的水凝胶DbpGMA。小于90 μm的骨颗粒有效地保留了脱矿后的胶原基质，形成了均匀的DBP溶胶，具有良好的加工性能。GMA在盐酸基DBP溶胶中的改性效率高于醋酸基溶胶，甲基丙烯酸化程度更高。DbpGMA水凝胶表现出可调节的力学和流变性能，这取决于聚合物浓度和紫外线照射。值得注意的是，将浓度从10%增加到30%，胶凝时间从130秒明显缩短到10秒，而将UV固化时间从0秒延长到10秒，导致内部孔径从75 μm大幅减小到12 μm。在测试配方中，20% DbpGMA在机械强度（10%应变时压缩模量为150.3±12.2 kPa）和DLP打印保真度之间提供了最佳平衡。此外，加入0.1% （w/v）的酒黄石作为光吸收剂，通过控制光的穿透，显著提高了形状保真度，从而促进了精细血管通道的打印，分辨率为0.7毫米。DbpGMA表现出良好的细胞相容性，即使在没有外部诱导剂的情况下，也能支持牙髓干细胞（DPSCs）的增殖和成牙分化。天然骨源性细胞外基质组成、光固化性和高打印分辨率的结合突出了DbpGMA作为DLP生物链接的多功能性。总的来说，DbpGMA代表了一个具有生物功能和dlp兼容的平台，用于制造高分辨率、细胞负载的结构，为牙本质-牙髓再生和牙硬组织工程提供了巨大的潜力。

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引用次数: 0

Effect of CN9021 crosslinker content on mechanical and actuation properties of acrylic dielectric elastomers and their constitutive modeling CN9021交联剂含量对丙烯酸介电弹性体力学性能和驱动性能的影响及其本构建模

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2026-01-01 DOI: 10.1016/j.polymertesting.2025.109083

Qinqin Wang , Changgeng Shuai , Xue Yang , Xingying Zhang , Weibin Wu , Gang Lu

Dielectric elastomers (DEs) are promising electroactive polymers with large strain capability (

>

100%) and high energy density, but commercial VHB materials require substantial pre-stretching (300%–500%) and exhibit high viscoelastic losses. This study systematically investigates CN9021 crosslinker content (30-100 wt%) effects on acrylate-based DE materials through UV photopolymerization. Crosslinking density was tuned from 1.42

\times

10⁻⁵ to 5.12

\times

10⁻⁵ mol/cm, enabling a 7.4-fold tuning of Young’s modulus (from 0.05 to 0.37 MPa). UB55 exhibited significantly lower energy dissipation (9.69%) compared to VHB4910 (29.82%). The third-order Ogden model accurately describes mechanical behavior (R

^{2} > 0.9999

). All materials demonstrated superior dielectric constants (5.8-6.4) versus VHB4910 (4.7). Medium crosslinking density UB55 achieved 198% area strain at 57.7 kV/mm under pre-stretch, while high crosslinking density UB82 enabled 15.6% strain at 21.7 kV/mm without pre-stretching. UB55 demonstrated excellent long-term stability with approximately 12% dynamic amplitude maintained over 10,000 cycles. Both materials maintained a dynamic amplitude approximately 5 times higher than VHB4910 at 30 Hz. This work establishes a systematic design strategy for tailoring DE performance to meet diverse operational requirements.

介电弹性体（DEs）是一种很有前途的电活性聚合物，具有大应变能力（>100%）和高能量密度，但商用VHB材料需要大量的预拉伸（300%-500%），并且具有高粘弹性损失。本研究系统地研究了CN9021交联剂含量（30- 100wt %）对丙烯酸酯基DE材料紫外光聚合的影响。交联密度从1.42 × 10−5调整到5.12 × 10−5 mol/cm，杨氏模量从0.05调整到0.37 MPa，调整了7.4倍。与VHB4910（29.82%）相比，UB55的能量耗散显著降低（9.69%）。三阶Ogden模型准确地描述了力学行为（R2>0.9999）。所有材料的介电常数（5.8-6.4）均优于VHB4910（4.7）。预拉伸条件下，中等交联密度UB55在57.7 kV/mm下实现了198%的面积应变，而未预拉伸条件下，高交联密度UB82在21.7 kV/mm下实现了15.6%的应变。UB55表现出优异的长期稳定性，在10,000次循环中保持了约12%的动态幅度。两种材料在30 Hz时的动态振幅都比VHB4910高约5倍。这项工作建立了一个系统化的设计策略，用于定制DE性能，以满足不同的操作要求。

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引用次数: 0

Tuning the crystallization and polymorphic composition of polypropylene by organo-silane-modified silica 有机硅改性二氧化硅调控聚丙烯的结晶和晶型组成

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2026-01-01 DOI: 10.1016/j.polymertesting.2026.109085

David Jaska , Jana Navratilova , Roman Svoboda , Sona Zenzingerova , Lenka Gajzlerova , Martina Polaskova , Roman Cermak

This work investigates the influence of the alkyl chain length in organosilane-modified silica particles on the crystallization behavior and polymorphic composition of isotactic polypropylene (iPP). Using differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS), blends of iPP with both modified and unmodified SiO₂ particles were analyzed. The kinetics of isothermal crystallization was calculated as well. The results show that organosilane-modified silica promotes the formation of the β-phase, with its proportion increasing alongside the length of the alkyl chain. Besides, the polymorphic composition of iPP is significantly affected by cooling rate and crystallization temperature, with rapid cooling favoring β-phase formation. The highest β-phase content in iPP is achieved using silica modified with octadecyltriethoxysilane (C18) combined with rapid cooling or isothermal crystallization below 134 °C. Notably, these significant effects were achieved at a very low silica concentration of just 0.2 wt percent in the polymer matrix. The combination of Hoffman-Lauritzen theory and Avrami kinetics model was applied to study the influence of silica modification on crystallization kinetics: The effect on morphology proved to be greater than on the crystallization kinetics. This study provides insights into tailoring the crystallization and polymorphism of iPP via surface modification of filler particles in combination with setting of processing conditions.

本文研究了有机硅烷改性二氧化硅颗粒中烷基链长度对等规聚丙烯（iPP）结晶行为和晶型组成的影响。采用差示扫描量热法（DSC）和广角x射线散射法（WAXS）对iPP与改性和未改性SiO2颗粒的共混物进行了分析。并计算了等温结晶动力学。结果表明，有机硅烷改性二氧化硅促进了β相的形成，其比例随烷基链长度的增加而增加。此外，iPP的多晶组成受冷却速率和结晶温度的显著影响，快速冷却有利于β相的形成。用十八烷基三乙氧基硅烷（C18）改性二氧化硅，结合134℃以下的快速冷却或等温结晶，可获得iPP中最高的β相含量。值得注意的是，这些显著的效果是在聚合物基质中二氧化硅浓度仅为0.2%的情况下实现的。结合Hoffman-Lauritzen理论和Avrami动力学模型，研究了二氧化硅改性对结晶动力学的影响：对形貌的影响大于对结晶动力学的影响。本研究为结合工艺条件的设置，通过填料颗粒的表面改性来定制iPP的结晶和多态性提供了见解。

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引用次数: 0

Dual utilization of CO2 in polymethyl methacrylate: A predictive solubility model for microcellular foaming and controlled drug release 二氧化碳在聚甲基丙烯酸甲酯中的双重利用：微孔发泡和药物控制释放的预测溶解度模型

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2025-12-25 DOI: 10.1016/j.polymertesting.2025.109080

Donghwan Lim , Jaehoo Kim , Jiwon Kwon , Kwanhoon Kim , Jaewoo Kim , Yong Hoon Jang , Jun Young Yoon , Sung Woon Cha

This study propose and validate a testing methodology for process control of the Microcellular Foaming Process (MCP), which is essential for achieving reproducible and uniform cell morphologies. A critical component of this methodology is the accurate prediction of CO₂ solubility. Previous studies have mainly relied on the Sanchez–Lacombe and Peng–Robinson–Stryjek–Vera equations (PRSV–EOS) of state along with the chemical potential equilibrium approach. However, PRSV–EOS exhibit limited accuracy in predicting CO₂ density near the critical points and phase transition boundaries. To improve the accuracy of such predictions, herein, we used the Span–Wagner equation of state. Although a constant binary interaction parameter was used for computational simplicity, the model was successfully validated with an average relative deviation below 8.5 % in the range of 263–313 K and 0–8 MPa. Based on the calculated solubility, post-analysis of the MCP results enabled the identification of essential parameters for predicting cell density under these conditions. Additionally, a polymethyl methacrylate–sodium benzoate (NaBz) composite was fabricated and tested for its release characteristics The findings revealed that the release characteristics varied with the NaBz volume fraction of this composite and the initial porosity generated by the MCP, showing percolation-dependent behavior. This confirms the MCP's potential as a valuable testing and fabrication technique for high-value biomedical applications.

本研究提出并验证了微孔发泡过程（MCP）过程控制的测试方法，这对于实现可复制和均匀的细胞形态至关重要。该方法的一个关键组成部分是准确预测二氧化碳的溶解度。以往的研究主要依赖于状态的Sanchez-Lacombe和Peng-Robinson-Stryjek-Vera方程（PRSV-EOS）以及化学势平衡方法。然而，在预测临界点和相变边界附近的CO2密度时，PRSV-EOS的准确性有限。为了提高这种预测的准确性，我们在这里使用了Span-Wagner状态方程。为了简化计算，采用恒定的二元相互作用参数，在263 ~ 313 K和0 ~ 8 MPa范围内，模型的平均相对偏差小于8.5%。根据计算的溶解度，对MCP结果进行后分析，可以确定在这些条件下预测细胞密度的基本参数。此外，制备了一种聚甲基丙烯酸甲酯-苯甲酸钠（NaBz）复合材料，并对其释放特性进行了测试。结果表明，释放特性随该复合材料中NaBz的体积分数和MCP产生的初始孔隙度而变化，表现出渗透依赖行为。这证实了MCP作为高价值生物医学应用的一种有价值的测试和制造技术的潜力。

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