Iranian Polymer Journal最新文献_第2页

A novel naphthyl amine curing agent and its effect on curing performance of AF-type phthalonitrile resin 一种新型萘胺固化剂及其对af型酞腈树脂固化性能的影响

IF 2.8 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal

Pub Date : 2025-07-03 DOI: 10.1007/s13726-025-01524-9

Guanglai Zhu, Chao Xu, Ziyi Xu, Yitao Yu, Cuicui Sun, Haihua Zhuang, Baichang Ma, Yantao Hou, Bing Li, Zhenhua Wang, Caifeng Dai

Phthalonitrile (PN) resins are high-performance thermosetting polymers recognized for their exceptional thermal stability and flame resistance, making them attractive candidates for aerospace, electronics, and high-temperature structural applications. However, their broader adoption is hindered by two primary challenges: the high melting point of PN precursors and the volatility of conventional curing agents, which complicate processing and raise safety concerns. Despite ongoing research, effective strategies that simultaneously address these issues while enhancing the overall performance of PN resins remain limited. In this study, we introduce a novel self-catalyzing curing agent, 4-(7-amino-1-naphthoxy) phthalonitrile (ANP), which functions both as a precursor and curing agent. The presence of amino and naphthoxy groups promotes efficient curing without the need for external catalysts, thereby expanding the processing window. Additionally, amino and cyano groups act as reactive sites and flexibilizers, enhancing the properties of bisphenol A-based PN (AFPN) resin systems. Thermal analysis revealed that the ANP-modified resin exhibits outstanding thermal and thermo-oxidative stability, with a 5% weight loss temperature (T_5%) exceeding 450 °C and a glass transition temperature (T_g) above 439 °C. Vector network analysis further demonstrated excellent dielectric properties, with a dielectric constant (D_k) of 3.15 and a dissipation factor (D_f) of 0.017 at 9.05 GHz. These findings indicate that ANP effectively overcomes key limitations of conventional PN resins. As a multifunctional curing agent, ANP shows significant potential for the development of advanced PN-based composites in aerospace, electronic packaging, and microelectronic applications.

Graphical abstract

邻苯二腈（PN）树脂是一种高性能热固性聚合物，因其优异的热稳定性和阻燃性而得到认可，使其成为航空航天、电子和高温结构应用的有吸引力的候选者。然而，它们的广泛采用受到两个主要挑战的阻碍：PN前体的高熔点和传统固化剂的波动性，这使加工复杂化并引起安全问题。尽管正在进行的研究，有效的策略，同时解决这些问题，同时提高PN树脂的整体性能仍然有限。在这项研究中，我们介绍了一种新的自催化固化剂，4-（7-氨基-1-萘氧基）邻苯二腈（ANP），它既是前驱体又是固化剂。氨基和萘氧基的存在促进了有效的固化，而不需要外部催化剂，从而扩大了加工窗口。此外，氨基和氰基作为反应位点和柔韧剂，增强了双酚基PN （AFPN）树脂体系的性能。热分析表明，anp改性树脂表现出优异的热稳定性和热氧化稳定性，5%的失重温度（T5%）超过450℃，玻璃化转变温度（Tg）超过439℃。矢量网络分析进一步证明了其优异的介电性能，在9.05 GHz时介电常数（Dk）为3.15，耗散因子（Df）为0.017。这些发现表明，ANP有效地克服了传统PN树脂的关键局限性。作为一种多功能固化剂，ANP在航空航天、电子封装和微电子应用领域的先进聚丙烯腈基复合材料的开发中显示出巨大的潜力。图形抽象

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引用次数: 0

Concise preparation and properties of the functional material polylactic acid modified by cystamine 半胱胺改性功能材料聚乳酸的制备及性能研究

IF 2.8 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal

Pub Date : 2025-07-02 DOI: 10.1007/s13726-025-01516-9

Shi-He Luo, Ying Xiao, Xi-Ying Cao, Zhong-Hao Li, Shi-Hang Yang, Jian-Yun Lin, Qiang Wang, Xin-Tai Chen, Zhao-Yang Wang

Polylactic acid (PLA) is one of promising biocompatible and biodegradable polyesters. Cystamine (Cys) is a non-toxic simple compound containing disulfide bond. Polymermaterials containing disulfide bond used for drug delivery can undergo reduction reaction, leading to structural disintegration and the release of loaded drugs to achieve targeted drug transport and controlled delivery. To enrich the application of PLA and develop the preparation method of functional PLA material, a series of polymer PLACs were successfully prepared from lactic acid (LA) and Cys through direct melt polycondensation in a one-pot process. The structure and performance of the polymer PLACs were studied systematically. The results indicated that the disulfide bond can be smoothly incorporated into polymeric chain through the simple condensation of LA and Cys. The performances of polymer PLACs can be controlled by adjusting the feed ratio within a certain feed ratio range. Importantly, the -S–S-bond can be cleaved by the reducing agent dithiothreitol (DTT), resulting the corresponding PLA material with terminal thiol groups. When the ratio of n(LA) to n(Cys) is 30 to 1, the polymerization is optimal. Therefore, this method is expected to further facilitate the rapid formation of functional PLA telechelic polymer with disulfide bonds. Furthermore, PLACs have potential applications in the encapsulation and controlled release of disulfide bonds-containing molecules for systemic circulation in vivo.

Graphical abstract

聚乳酸（PLA）是一种很有前途的生物相容性和可生物降解聚酯。半胺（cyys）是一种含二硫键的无毒简单化合物。含二硫键的高分子材料用于给药，通过还原反应导致结构崩解和载药的释放，实现药物的靶向转运和控制给药。为了丰富PLA的应用领域，发展PLA功能材料的制备方法，以乳酸（LA）和Cys为原料，采用一锅法直接熔融缩聚法制备了一系列聚合物PLACs。系统地研究了聚合物PLACs的结构和性能。结果表明，通过LA和Cys的简单缩合，二硫键可以顺利地结合到聚合物链中。在一定的进料比范围内，通过调节进料比可以控制聚合物PLACs的性能。重要的是，- s - s键可以被还原剂二硫苏糖醇（DTT）切割，从而得到相应的具有末端巯基的PLA材料。当n（LA）与n（Cys）的比例为30∶1时，聚合效果最佳。因此，该方法有望进一步促进具有二硫键的功能聚乳酸远螺旋聚合物的快速形成。此外，PLACs在含二硫键分子的体内体循环包封和控释方面具有潜在的应用前景。图形抽象

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引用次数: 0

Effect of small-scale helmholtz coil magnetic field and high-shear mixing on Fe3O4/GO nanoparticle distribution in epoxy: shielding-mechanical properties 小尺度亥姆霍兹线圈磁场和高剪切混合对环氧树脂中Fe3O4/GO纳米颗粒分布的影响：屏蔽-力学性能

IF 2.8 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal

Pub Date : 2025-06-27 DOI: 10.1007/s13726-025-01497-9

Mohsen Ghiasvand, Hamid Fazeli, Jafar Eskandari Jam, Abbas Kebritchi

Nanocomposite materials have garnered significant attention in recent years due to their potential to enhance mechanical properties. This study investigates a novel mixing technique that simultaneously combines the influence of a small-scale Helmholtz Coil magnetic field and a high-shear turbomixer for the effective dispersion and distribution of iron oxide (Fe₃O₄) and graphene oxide (GO) within an epoxy resin. The preparation of these nanocomposites was systematically conducted using a full factorial design method, allowing for a comprehensive examination of the effect of varying concentrations of GO (0.3, 0.5, and 0.7 wt%) and Fe₃O₄ (2, 5, and 8 wt%) nanoparticles on the tensile properties.To assess the distribution quality of Fe₃O₄/GO within the nanocomposite matrix, X-ray diffractometry (XRD) and scanning electron microscopy (SEM) were employed.Moreover, electromagnetic wave shielding properties have been evaluatedusinga vector network analyzer (VNA). The results indicated that the application of a magnetic field during mixing led to significant improvements in mechanical properties: specifically, there was a 32.5% increase in tensile strength (reaching 87.08 MPa), a 94.1% increase in toughness (at 1.98 J/m³), and a 45.8% increase in elongation (to 4.549%). However, a slight decrease of 2.2% in tensile modulus was observed compared to pure epoxy, measuring 2058.6 MPa. As a novel idea,the better dispersion of GO nanoparticles may be achieved by first applying an external magnetic field to orient the Fe₃O₄ (magnetic nanoparticles), then the Fe₃O₄ would help align and disperse the GO (non-magnetic nanoparticles) through secondary forces between Fe₃O₄ metallic-surface and GO functional-groups.

Graphical Abstract

纳米复合材料由于具有提高机械性能的潜力，近年来引起了人们的广泛关注。本研究研究了一种新型混合技术，该技术同时结合了小规模亥姆霍兹线圈磁场和高剪切涡轮混合器的影响，以有效分散和分布环氧树脂中的氧化铁（Fe3O4）和氧化石墨烯（GO）。采用全因子设计方法系统地制备了这些纳米复合材料，从而全面检查了不同浓度的氧化石墨烯（0.3、0.5和0.7 wt%）和Fe3O4（2、5和8 wt%）纳米颗粒对拉伸性能的影响。为了评估Fe3O4/GO在纳米复合基体中的分布质量，采用了x射线衍射（XRD）和扫描电子显微镜（SEM）。此外，还利用矢量网络分析仪（VNA）对其电磁波屏蔽性能进行了评价。结果表明，混合过程中施加磁场导致力学性能显著改善：拉伸强度提高32.5%（达到87.08 MPa），韧性提高94.1%（达到1.98 J/m3），伸长率提高45.8%（达到4.549%）。然而，与纯环氧树脂相比，拉伸模量略有下降2.2%，为2058.6 MPa。作为一种新颖的想法，可以通过首先施加外部磁场来定向Fe3O4（磁性纳米粒子），然后Fe3O4通过Fe3O4金属表面和GO官能团之间的二次力来帮助GO（非磁性纳米粒子）排列和分散，从而实现更好的氧化石墨烯纳米粒子的分散。图形抽象

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引用次数: 0

Development of shape memory PLA with controllable stimulation temperature and dual-responsive properties by adding PEG 加入聚乙二醇制备具有可控刺激温度和双响应性能的形状记忆PLA

IF 2.8 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal

Pub Date : 2025-06-25 DOI: 10.1007/s13726-025-01499-7

Baoji Hu, Yirui Chen, Manman Zhai, Mengying Li, Yike Peng, Feiyang Xu, Yifan Zhang, Jianhong Liu, Weili Shao, Qiaoling Zhang

Shape memory polylactic acid (PLA)/polyethylene glycol (PEG) films with controllable thermal response temperature and dual-responsive function were developed. The developed PLA/PEG film exhibits excellent shape memory performance and can recover to its initial shape within 6 s. The shape memory PLA/PEG films achieved controllable thermal response temperature by physically modifying PLA with PEG. Compared with P-P0 (pure PLA), the thermal response temperature of P-P10 (PLA/PEG film with a mass ratio of 10/1 of PLA to PEG) was reduced by 20 °C. Based on the differences in thermal response temperature of PLA/PEG films with different PEG contents, PLA/PEG bilayer films have achieved dual-responsive shape memory function. Moderate PEG improved the mechanical properties of PLA/PEG films. Compared with P-P0, Young's modulus, breaking stress, and breaking strain of P-P10 increased by 113 MPa, 7.8 MPa, and 15.2 MPa, respectively. The thermal performance of PLA/PEG films can be controlled by PEG content. Compared with P-P0, the glass transition temperature, cold crystallization temperature, melting temperature, and thermal decomposition temperature of P-P10 are reduced by 9.8 °C, 13.8 °C, 0.6 °C, and 7.5 °C, respectively. In summary, the developed shape memory PLA/PEG films have controllable response temperature, dual-responsive function, and improved mechanical properties, showing promising application prospects in the field of flexible intelligent biomaterials.

Graphical Abstract

研制了具有热响应温度可控、双响应功能的形状记忆型聚乳酸(PLA)/聚乙二醇（PEG）薄膜。所制备的聚乳酸/聚乙二醇薄膜具有优异的形状记忆性能，可在6 s内恢复到初始形状。利用聚乙二醇对聚乳酸进行物理改性，制备了形状记忆PLA/PEG薄膜，实现了热响应温度可控。与P-P0（纯PLA）相比，P-P10 （PLA/PEG质量比为10/1的PLA/PEG薄膜）的热响应温度降低了20℃。基于不同PEG含量的PLA/PEG膜的热响应温度差异，PLA/PEG双层膜实现了双响应形状记忆功能。适量的聚乙二醇提高了聚乳酸/聚乙二醇薄膜的力学性能。与P-P0相比，P-P10的杨氏模量、断裂应力和断裂应变分别提高了113 MPa、7.8 MPa和15.2 MPa。聚乳酸/聚乙二醇薄膜的热性能可以通过聚乙二醇含量来控制。与P-P0相比，P-P10的玻璃化转变温度、冷结晶温度、熔融温度和热分解温度分别降低了9.8℃、13.8℃、0.6℃和7.5℃。综上所述，所制备的形状记忆PLA/PEG薄膜具有响应温度可控、双响应功能、力学性能改善等特点，在柔性智能生物材料领域具有广阔的应用前景。图形抽象

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引用次数: 0

Plasma-induced modification of carbon nanofiber for enhanced compatibilization and reinforcement of linear low-density polyethylene 等离子体诱导改性碳纳米纤维增强线性低密度聚乙烯的相容性和增强性能

IF 2.8 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal

Pub Date : 2025-06-23 DOI: 10.1007/s13726-025-01517-8

Priscila Espinoza-Ibarra, Saul Sánchez-Valdés, Julieta Torres-González, Rachel Faverzani Magnago, Afonso Henrique Da Silva Junior, Adriano Da Silva, M. M. Da Silva Paula, Luciano Da-Silva

The effects of power and time on the surface modification of carbon nanofibers (CNF) were studied through plasma polymerization of ethylene. Power is found to be crucial in the coating deposition, as it is directly related to the energy applied during polymerization. Through infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and Raman spectra it was determined that the optimal plasma modification conditions were 100 W and 45 min, resulting in the greatest coating on CNF. TEM micrographs were obtained to study the morphological changes in the CNF coated with ethylene plasma and we detected coating thicknesses between 5.8 and 10.2 nm. The nanocomposites were prepared using linear low-density polyethylene/cyclic olefin copolymer (LLDPE/COC) and CNF modified with ethylene plasma (CNF4) at 1%, 2% and 3% by weights. Scanning electron microscopy (SEM) revealed a homogeneous dispersion of COC spheres in the LLDPE, while the CNF was found confined within the LLDPE. In mechanical tests, the incorporation of 2% and 3% CNF4 improved the elastic modulus, achieving values between 690–800 MPa, and impact resistance increased by 20% using 2% CNF4, compared to the LLDPE/COC blend. This study aims to obtain a material based on LLDPE/COC/CNF as an alternative to UHMWPE.

Graphical abstract

采用等离子体聚合乙烯的方法，研究了功率和时间对碳纳米纤维表面改性的影响。功率在涂层沉积中是至关重要的，因为它与聚合过程中应用的能量直接相关。通过红外光谱（FTIR）、热重分析（TGA）和拉曼光谱（Raman），确定了等离子体修饰的最佳条件为100 W和45 min，可获得最大的CNF涂层。用透射电镜观察了乙烯等离子体包覆CNF后的形貌变化，发现包覆厚度在5.8 ~ 10.2 nm之间。采用线性低密度聚乙烯/环烯烃共聚物（LLDPE/COC）和乙烯等离子体（CNF4）改性的CNF（重量分别为1%、2%和3%）制备了纳米复合材料。扫描电镜（SEM）显示COC球在LLDPE中均匀分散，而CNF则被限制在LLDPE内。在力学测试中，与LLDPE/COC共混物相比，加入2%和3% CNF4提高了弹性模量，达到690-800 MPa之间，使用2% CNF4的抗冲击性提高了20%。本研究旨在获得一种基于LLDPE/COC/CNF的材料，作为UHMWPE的替代品。图形抽象

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引用次数: 0

Polylactic acid-based bio-composites as a substitute in the automotive industry: improving mechanical properties 聚乳酸基生物复合材料在汽车工业中的替代品：改善机械性能

IF 2.8 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal

Pub Date : 2025-06-17 DOI: 10.1007/s13726-025-01522-x

Ramazan Yildirim, Levent Elen

The mechanical and microstructural properties of biocomposites produced through hot press compression molding of polylactic acid (PLA), PLA with polybutylene succinate (PLA + PBS), and flax fibers were investigated. The flax mat fibers underwent surface treatment with a sodium hydroxide (NaOH) solution. This treatment induced fibrillation on the fiber surfaces, enhancing the fiber-matrix interfacial bonding and improving the mechanical properties. The density of the biocomposites remained largely unchanged; however, significant variations were observed in their hardness. The tensile strength of surface-treated biocomposites exhibited a substantial increase, ranging from 40 to 60%. The incorporation of PBS resulted in a notable enhancement in elongation-at-break, increasing by 10–40% compared to PLA. In the bending tests, biocomposites containing PBS demonstrated the highest elongation values, whereas those without PBS exhibited the highest bending stress. Moreover, the addition of PBS to the PLA matrix enhanced the plasticization effect, leading to an increase in elongation-at-break. Furthermore, the glass transition temperature and crystallization temperature of flax fiber-reinforced biocomposites (PLA + F) and surface-treated biocomposites (N-PLA + F) increased compared to untreated samples. Additionally, an increase in the melting temperature was observed in all biocomposites, except for the PLA + PBS mixture.

Graphical abstract

研究了聚乳酸（PLA）、聚丁二酸聚丁二酸（PLA + PBS）和亚麻纤维热压成型生物复合材料的力学和微观结构性能。用氢氧化钠溶液对亚麻毡纤维进行表面处理。该处理诱导纤维表面发生纤颤，增强了纤维与基体的界面结合，改善了纤维的力学性能。生物复合材料的密度基本保持不变；然而，在硬度上观察到显著的变化。经表面处理的生物复合材料的抗拉强度有明显的提高，从40%到60%不等。PBS的掺入导致断裂伸长率显著提高，与PLA相比增加了10-40%。在弯曲试验中，含有PBS的生物复合材料的伸长率最高，而不含PBS的生物复合材料的弯曲应力最高。此外，在PLA基体中加入PBS增强了塑化效果，导致断裂伸长率增加。此外，亚麻纤维增强生物复合材料（PLA + F）和经过表面处理的生物复合材料（N-PLA + F）的玻璃化转变温度和结晶温度均高于未处理的样品。此外，除了PLA + PBS混合物外，所有生物复合材料的熔融温度都有所升高。图形抽象

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引用次数: 0

Photodegradation ability of electrospun Ag–Co/polysulfone nanocomposite nanofibers against acetamiprid pesticide 静电纺Ag-Co /聚砜纳米复合纤维对啶虫啉农药的光降解能力

IF 2.8 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal

Pub Date : 2025-06-16 DOI: 10.1007/s13726-025-01511-0

Mazhar Ali, Tamanna Gul, Falak Naz, Soo Young Park, Khalid Saeed

Non-woven neat polysulfone (PSU) and Ag–Co/PSU nanocomposite nanofibers were prepared by electrospinning process. The electrospun non-woven neat PSU and Ag–Co/PSU nanocomposite nanofibers were characterized through scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR) and X-ray diffractometry (XRD). The SEM study presented that PSU and Ag–Co/PSU nanocomposites nanofibers were smooth, bead less, and randomly oriented. The diameter of neat PSU and Ag-Co/PSU nanocomposite nanofibers was below 800 nm. EDX spectra illustrated the elemental composition of non-woven neat PSU nanofibers and Ag–Co/PSU nanocomposite nanofibers, which showed the presence of Ag–Co NPs (nanoparticles) in the composite nanofibers. The FTIR spectrum of Ag–Co/PSU presented a peak at 710 cm⁻¹, which might be due to the presence of Ag/Co NPs in PSU electrospun nanofibers. The photodegradation study presented that the neat PSU and Ag–Co/PSU nanocomposite nanofibers degraded about 74% and 83% acetamiprid pesticide within 5 h, respectively. It was also found that the neat PSU degraded about 20% and 67% acetamiprid pesticide while Ag–Co/PSU nanocomposite nanofibers degraded about 25% and 78% using 0.010 and 0.030 g nanofibers, respectively. Further, it was also found that the recovered PSU and Ag–Co/PSU nanocomposite electrospun nanofibers significantly degraded the acetamiprid pesticide. The photodegradation efficiency of recovered Ag–Co/PSU (47%) was higher than that of recovered neat PSU nanofibers (28%). It means that Ag–Co/PSU nanocomposite nanofibers had superior photocatalytic activity as compared to neat PSU nanofibers. Furthermore, the data were better fitted by the pseudo-first-order kinetic model compared to the pseudo-second-order kinetic model.

Graphical abstract

采用静电纺丝法制备了无纺布整齐聚砜（PSU）和Ag-Co /PSU纳米复合纤维。采用扫描电镜（SEM）、能量色散x射线能谱（EDX）、傅里叶变换红外光谱（FTIR）和x射线衍射（XRD）对静电纺无纺布整齐PSU和Ag-Co /PSU纳米复合纳米纤维进行了表征。扫描电镜研究表明，PSU和Ag-Co /PSU纳米复合材料具有光滑、无珠、随机取向等特点。纯PSU和Ag-Co/PSU纳米复合纳米纤维的直径均在800 nm以下。EDX光谱分析了无纺布整齐PSU纳米纤维和Ag-Co /PSU纳米复合纤维的元素组成，表明复合纳米纤维中存在Ag-Co纳米粒子。Ag - Co/PSU的FTIR光谱在710 cm−1处出现峰值，这可能是由于PSU静电纺丝纳米纤维中存在Ag/Co NPs。光降解研究表明，纯PSU和Ag-Co /PSU纳米复合纳米纤维在5 h内对啶虫啉的降解率分别为74%和83%。在0.010 g和0.030 g纳米纤维条件下，纯PSU对乙酰氨虫的降解率分别为20%和67%，Ag-Co /PSU纳米复合纳米纤维对乙酰氨虫的降解率分别为25%和78%。此外，还发现回收的PSU和Ag-Co /PSU纳米复合静电纺纳米纤维对啶虫啉农药具有显著的降解作用。Ag-Co /PSU纳米纤维的光降解效率（47%）高于纯PSU纳米纤维（28%）。这意味着Ag-Co /PSU纳米复合纳米纤维比纯PSU纳米纤维具有更好的光催化活性。与拟二阶动力学模型相比，拟一阶动力学模型能更好地拟合数据。图形抽象

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引用次数: 0

Reconfigurableshape memory properties of recycled polyvinyl butyral materials through dynamic covalent bonds 利用动态共价键研究再生聚乙烯醇丁醛材料的可重构形状记忆特性

IF 2.8 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal

Pub Date : 2025-06-16 DOI: 10.1007/s13726-025-01521-y

Yi Yang, Yawen Sun, Xin Yang, Chenchen Zhang, Huajie Gao, Haorong Zhang, Jianfeng Wang, Yanyu Yang, Wanjie Wang, Yanxia Cao

This study investigates the shape memory and reconfigurability behaviors of recycled polyvinyl butyral (RPVB) with partially extracted plasticizer, which is crosslinked using hexamethylene diisocyanate (HDI) and a catalyst, dibutyltin dilaurate (DBTDL). The use of RPVB, a recycled plastic, is significant as it contributes to sustainability by reducing waste and promoting the reuse of plastic materials. The effect of HDI content on the shape memory performance of RPVB was explored, with emphasis on the catalyst's role in enhancing its reconfigurability. RPVB-20, with 20% plasticizer extraction, exhibits excellent shape fixation at room temperature, with a shape recovery rate (R_r) of 81.2%, which increases to over 95% after HDI crosslinking. The addition of DBTDL further improves the material's reconfigurability, enabling it to adopt new permanent shapes through dynamic covalent bond exchange at 160 °C. The material demonstrates good shape memory performance with an R_f of 99.4% and an R_r of 96.9% when 0.2 phr HDI is added. Stress relaxation and creep tests show that the catalyst accelerates urethane exchange, providing plasticity at elevated temperatures. Furthermore, RPVB-20-0.2-DL exhibits excellent reprocessing properties, with stable mechanical properties after reprocessing, making it suitable for manufacturing permanent three-dimensional shapes and for potential recycling applications. The results suggest that dynamic covalent bonds in RPVB shape memory polymers offer both high reconfigurability and stable mechanical properties, providing a promising approach for sustainable material design in smart applications while promoting the recycling and reusing of plastic materials in line with environmental objectives.

本文研究了再生聚乙烯醇丁醛（RPVB）与部分提取增塑剂的形状记忆和可重构性行为，该增塑剂是用六亚甲基二异氰酸酯（HDI）和催化剂二酸二丁基锡（DBTDL）交联的。再生塑料的使用意义重大，因为它通过减少废物和促进塑料材料的再利用，有助于可持续发展。探讨了HDI含量对RPVB形状记忆性能的影响，重点研究了催化剂在提高RPVB可重构性中的作用。当增塑剂提取率为20%时，RPVB-20在室温下具有良好的固形性能，固形回收率为81.2%，经HDI交联后可提高到95%以上。DBTDL的加入进一步提高了材料的可重构性，使其能够在160°C下通过动态共价键交换采用新的永久形状。当添加0.2 phr HDI时，材料的形状记忆性能良好，Rf为99.4%，Rr为96.9%。应力松弛和蠕变试验表明，催化剂加速聚氨酯交换，在高温下提供塑性。此外，RPVB-20-0.2-DL具有优异的后处理性能，后处理后具有稳定的机械性能，适用于制造永久性三维形状和潜在的回收应用。结果表明，RPVB形状记忆聚合物中的动态共价键提供了高可重构性和稳定的机械性能，为智能应用中的可持续材料设计提供了一种有前途的方法，同时促进了塑料材料的回收和再利用，符合环境目标。

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引用次数: 0

Polypropylene/ethylene blend–Cloisite nanocomposites: preparation and characterization 聚丙烯/乙烯共混- cloisite纳米复合材料的制备与表征

IF 2.8 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal

Pub Date : 2025-06-14 DOI: 10.1007/s13726-025-01515-w

Babak Darkoush, Hossein Nazockdast, Zahed Ahmadi

A polymer matrix of polyolefin/clay nanocomposites with polypropylene/ethylene–octane copolymer (EOC) blend and Cloisite 15A as a nanofiller was fabricated and characterized. The nanocomposites were prepared with a fixed PP/EOC blend ratio, and different amounts of nanofiller, including 0, 1, 3, and 5% (by wt). The structural, morphological, rheological, and mechanical properties of the nanocomposites were evaluated by various tests. XRD results showed that with increasing the amount of nanofillers, the d-spacing of clay increased, while the size of clay galleries decreased. SEM images revealed that by incorporating nanofillers into the polymer blend, the size of dispersed phase decreased from 152 nm in the polymer blend to 123 nm in the nanocomposite with 5% (by wt) Cloisite. Rheometrics mechanical spectrometer (RMS) results disclosed that the complex viscosity, storage modulus, shear-thinning behavior, and relaxation time increased proportionally with the amount of nanofillers, and the nanocomposite with 5% (by wt) Cloisite had the highest solid-like behavior. Mechanical test confirmed that with increasing the amount of nanofillers, the tensile strength and elastic modulus increased, while the elongation-at-break and impact strength decreased. By adding 5% (by wt) Cloisite to the polymer blend, the tensile strength and modulus increased by 18 and 23%, and elongation-at-break and impact strength decreased by 74 and 17%, respectively.

Graphical abstract

以聚丙烯/乙烯-辛烷共聚物（EOC）共混，Cloisite 15A为纳米填料，制备了聚烯烃/粘土纳米复合材料。以固定的PP/EOC共混比例和不同数量的纳米填料（0、1、3和5%）（按重量计）制备纳米复合材料。通过各种测试评估了纳米复合材料的结构、形态、流变学和力学性能。XRD结果表明，随着纳米填料用量的增加，粘土的d间距增大，而粘土廊的尺寸减小。SEM图像显示，在聚合物共混物中加入纳米填料后，分散相的尺寸从聚合物共混物中的152 nm减小到含有5% (wt) Cloisite的纳米复合材料中的123 nm。流变力学谱（RMS）结果表明，复合材料的粘度、存储模量、剪切减薄行为和弛豫时间随纳米填料的添加量成比例地增加，其中含5% (wt) Cloisite的纳米复合材料具有最高的类固体行为。力学试验证实，随着纳米填充剂用量的增加，拉伸强度和弹性模量增加，断裂伸长率和冲击强度降低。在共混聚合物中加入5%（以重量计）的Cloisite，拉伸强度和模量分别提高了18%和23%，断裂伸长率和冲击强度分别降低了74%和17%。图形抽象

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引用次数: 0

Development and characterization of polypropylene or polyamide 6 hybrid composites filled with magnetite and silicon carbide 磁铁矿与碳化硅填充聚丙烯或聚酰胺6杂化复合材料的研制与表征

IF 2.8 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal

Pub Date : 2025-06-13 DOI: 10.1007/s13726-025-01518-7

Meral Akkoyun Kurtlu, Beril Tuncay, Sibel Tuna

Polymers, which are becoming widespread day by day and find use in almost every domestic and industrial sectors, have many advantageous properties, on the other hand, their use in areas where thermal conductivity needed is limited due to their low thermal conductivity. To overcome this problem, the requirement for composite materials with high thermal conductivity is increasing and studies on this subject are becoming widespread. In this context, it is known that the thermal conductivity values of the polymer composite structure can be improved by adding fillers to the polymer structures that will augment the thermal conductivity. In this study, to improve the thermal conductivity of polypropylene (PP) and polyamide 6 (PA6), hybrid composites of PP or PA6, separately, filled with silicon carbide (SiC) and magnetite (Fe₃O₄) were prepared. For this purpose, PP/SiC/Fe₃O₄ and PA6/SiC/Fe₃O₄ composites were produced in 1:1 filler ratio with different filler contents (5, 10 and 20% by wts) by extrusion method and shaped by compression molding to determine the optimum amount of additives. Afterward, thermal conductivity, electrical conductivity, mechanical, molecular spectroscopic, and microstructure analyses were carried out for the characterization of all composites. When the study results were examined, it was seen that the PP/SiC/Fe₃O₄ composite structure containing the highest filler ratio of 20% (by wt) improved by 26% and a thermal conductivity value with a higher enhancement of 38% was obtained for PA6/SiC/Fe₃O₄ composite prepared at the same filler content compared to neat polymers.

Graphical abstract

聚合物日益普及，几乎在每个家庭和工业部门都有使用，具有许多优点，另一方面，由于其导热性低，它们在需要导热性的领域的使用受到限制。为了克服这一问题，对高导热复合材料的要求越来越高，这方面的研究也越来越广泛。在这种情况下，已知聚合物复合结构的导热系数可以通过在聚合物结构中添加填料来提高导热系数来提高。为了提高聚丙烯（PP）和聚酰胺6 （PA6）的导热性能，分别制备了以碳化硅（SiC）和磁铁矿（Fe3O4）填充的PP或PA6杂化复合材料。为此，采用挤压法制备了PP/SiC/Fe3O4和PA6/SiC/Fe3O4复合材料，分别以1:1的填充比和不同的填充量（5、10、20% wts），通过挤压成型确定了最佳添加量。随后，对所有复合材料进行了导热性、电导率、力学、分子光谱和微观结构分析。通过对研究结果的检验，可以看出，在相同填料含量下制备的PA6/SiC/Fe3O4复合材料的PP/SiC/Fe3O4结构比纯聚合物提高了26%，导热系数提高了38%。图形抽象

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引用次数: 0