Polymer Testing最新文献

Fabrication of advanced polyphenylene sulfide composites by in-situ grafting of sulfide silane and PCPA on glass fibers 通过在玻璃纤维上原位接枝硫化硅烷和聚对苯二甲酸乙二醇酯，制造先进的聚苯硫醚复合材料

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-11-08 DOI: 10.1016/j.polymertesting.2024.108633

Youngsung Cho , Jangwoo Cho , Jooheon Kim

The energy crisis has driven increased adoption of electric vehicles (EVs) in the automotive sector, with a focus on lightweight engineering plastics (EPs) for fuel efficiency. This study aims to enhance the mechanical properties and thermal conductivity of EPs to address heat-related concerns in EVs and electronic devices. A hybrid filler (milled glass fiber, boron nitride, and graphene oxide) was introduced to polyphenylene sulfide (PPS), using a simultaneous grafting process with poly(catechol/polyamine) (PCPA) and silane additives. Filler aggregation in the resin matrix was overcome with surface-treatment agents such as Bis[3-(triethoxysilyl)propyl] tetrasulfide (Si69), catechol, and tetraethylenepentamine. PCPA polymerization on the filler surfaces bridged connections between fillers and silane molecules. The resulting surface-treated hybrid composite showed a 637 % increase in thermal conductivity (2.102 Wm⁻¹K⁻¹) and a 63.94 % increase in tensile strength (65.87 MPa) compared to the base matrix. Incorporating 40 wt% surface-treated mGF, 30 wt% raw BN, and 6 wt% surface-treated GO, along with PCPA and Si69 treatments, achieved this improvement. The hybrid filler composites significantly enhanced thermal conductivity and mechanical properties, providing a rapid and convenient solution to challenges in robustness and heat dissipation for electronic vehicles and devices.

能源危机促使汽车行业越来越多地采用电动汽车 (EV)，重点是轻质工程塑料 (EP)，以提高燃油效率。本研究旨在提高 EP 的机械性能和导热性，以解决电动汽车和电子设备中与热有关的问题。利用聚（邻苯二酚/聚胺）（PCPA）和硅烷添加剂同时接枝工艺，在聚苯硫醚（PPS）中引入了混合填料（研磨玻璃纤维、氮化硼和氧化石墨烯）。双[3-（三乙氧基硅基）丙基]四硫化物（Si69）、邻苯二酚和四乙烯五胺等表面处理剂克服了树脂基体中的填料聚集问题。填料表面的 PCPA 聚合在填料和硅烷分子之间架起了桥梁。与基体相比，经过表面处理的混合复合材料的热导率（2.102 Wm-1K-1）提高了 637%，拉伸强度（65.87 兆帕）提高了 63.94%。通过加入 40 wt% 经表面处理的 mGF、30 wt% 未加工 BN 和 6 wt% 经表面处理的 GO 以及 PCPA 和 Si69 处理，实现了上述改进。混合填料复合材料显著提高了导热性和机械性能，为解决电子车辆和设备在坚固性和散热方面的难题提供了快速便捷的解决方案。

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引用次数: 0

Microdroplet pull-out testing: Significance of fiber fracture results 微滴拉拔测试：纤维断裂结果的意义

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-11-08 DOI: 10.1016/j.polymertesting.2024.108631

Donghyen Lee , Jong-Hyun Kim , Seung Jun Lee , Mantae Kim , Dong-Jun Kwon

Fiber reinforced composites are used in structural materials that required light weight and stiffness. The properties of the fibers or matrix are important, but the interfacial properties have a significant impact on the properties of fiber reinforced composite. In this study, the interfacial shear strength (IFSS) was measured using acrylic resin and epoxy resin as base materials. The chemical composition of acrylic and epoxy matrix materials was analyzed to predict the effects on IFSS. Additionally, IFSS was measured through a microdroplet pull-out test. The reliability of the experimental results was enhanced by applying a statistical analysis to IFSS results. In the case of epoxy, GF/epoxy exhibited higher IFSS to twice and half times than CF/epoxy specimens. It means that the surface treatment of the fibers has a significant impact on the interface. In the case of acrylic, IFSS could be measured for GF. But in the case of CF, IFSS was too low to get accurate results of IFSS. Through this research, methods to improve the accuracy of composite interfacial strength measurement experiments were examined, and the study suggested the need for standardized criteria to evaluate composite interfacial adhesion.

纤维增强复合材料用于要求重量轻、刚度大的结构材料中。纤维或基体的性能固然重要，但界面性能对纤维增强复合材料的性能也有重大影响。本研究以丙烯酸树脂和环氧树脂为基材，测量了界面剪切强度（IFSS）。分析了丙烯酸树脂和环氧树脂基体材料的化学成分，以预测其对 IFSS 的影响。此外，还通过微滴拉出试验测量了 IFSS。通过对 IFSS 结果进行统计分析，提高了实验结果的可靠性。在环氧试样中，GF/环氧试样的 IFSS 比 CF/ 环氧试样高出两倍半。这说明纤维的表面处理对界面有重大影响。对于丙烯酸纤维，可以测量 GF 的 IFSS。但对于 CF，IFSS 太低，无法获得准确的 IFSS 结果。通过这项研究，我们探讨了提高复合材料界面强度测量实验准确性的方法，并提出有必要制定评估复合材料界面粘附性的标准化标准。

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引用次数: 0

Investigation of the degradation behaviour of poly-L-lactic acid braided stents under real-time and accelerated conditions 聚左旋乳酸编织支架在实时和加速条件下的降解行为研究

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-11-07 DOI: 10.1016/j.polymertesting.2024.108632

Agnese Lucchetti , Flavia Caronna , Lison Rocher , Karl Joyce , Martin Fawdry , Olena Kudina , William Ronan , Thomas Gries , Ted J. Vaughan

Degradation tests are a key step in the development of a bioresorbable stent. The present study focused on the degradation of bioresorbable stents made from PLLA filaments, and examined the variation of the physical, thermal, and mechanical properties of the material and the devices under both real-time and accelerated degradation conditions. Results showed that the undegraded filaments were highly crystalline and composed by both

α

and

α^{'}

crystalline phases, induced by both the melt spinning and heat treatment processes. The latter was shown to have an important influence on the further formation of

α

crystalline phase and therefore crystalline structure perfectioning. Real-time degradation tests showed that the devices maintained structural stability for up to a year, meeting the required 6-month degradation period for vascular stents. Degradation was shown to primarily affect the crystalline regions, and to cause a gradual loss of material ductility before any mass loss or decrease in crystallinity. In turn, a constant decrease of molecular weight was observed, with stent failure occurring around day 389 due to a drop in molecular weight below 10,000 g/mol. Accelerated degradation tests mirrored real-time results until mass loss began. Subsequently a slower molecular weight decrease was observed, with an increase and subsequent decrease of material crystallinity. The consistency of the data obtained between real-time and accelerated degradation before mass loss confirmed the possibility to gain insights into real-time degradation through an accelerated protocol. However, attention must be paid to the initial molecular weight of the material, which has been shown to highly influence the acceleration rate. This study provides a wide range of experimental data both on the real-time and thermally accelerated degradation behaviour of PLLA braided stents that can be used as benchmark for further studies in the field.

降解测试是开发生物可吸收支架的关键步骤。本研究以聚乳酸长丝制成的生物可吸收支架的降解为重点，考察了材料和装置在实时和加速降解条件下的物理、热和机械性能变化。结果表明，未降解的长丝具有很高的结晶度，由α和α′结晶相组成，熔融纺丝和热处理过程都会诱发α和α′结晶相。热处理对进一步形成 α 结晶相和完善结晶结构具有重要影响。实时降解测试表明，这些装置在长达一年的时间内保持了结构稳定性，符合血管支架所要求的 6 个月降解期。降解主要影响结晶区域，在出现质量损失或结晶度降低之前，会导致材料延展性逐渐降低。反过来，还观察到分子量的持续下降，由于分子量下降到 10,000 克/摩尔以下，支架在第 389 天左右就会失效。加速降解测试反映了实时结果，直到开始出现质量损失。随后观察到分子量下降速度减慢，材料结晶度也随之增加和降低。在质量损失之前，实时降解和加速降解获得的数据是一致的，这证实了通过加速方案深入了解实时降解的可能性。不过，必须注意材料的初始分子量，这已被证明会对加速速率产生很大影响。这项研究为聚乳酸编织支架的实时降解和热加速降解行为提供了广泛的实验数据，可作为该领域进一步研究的基准。

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引用次数: 0

Classification of black plastic types by hyperspectral imaging based on long-wave infrared emission spectroscopy 基于长波红外发射光谱的高光谱成像技术对黑色塑料类型进行分类

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-11-07 DOI: 10.1016/j.polymertesting.2024.108629

Mads Nibe Larsen , Anders Løchte Jørgensen , Victor Petrunin , Jakob Kjelstrup-Hansen , Bjarke Jørgensen , Mogens Hinge

Identification of black plastics poses a significant challenge in recycling due to the absorptive nature of carbon black additives. This work introduces a method where hyperspectral imaging in the long-wave infrared regime is used to distinguish between twelve samples of commercially available black plastics encompassing nine distinct polymer types. The spectral scanner comprises a scanning Fabry-Pérot interferometer and a thermal camera based on an uncooled microbolometer detector sensitive to wavelengths from 8 μm to 15 μm. A principal component model is combined with k-nearest neighbors to differentiate between plastic samples in hyperspectral images. The model successfully classifies five (PET, POM, PMMA, PA6, and PA66) out of nine black polymers, and the overall accuracy of the model is

A = 73.1

%.

由于炭黑添加剂的吸收特性，黑色塑料的识别成为回收利用中的一项重大挑战。这项工作介绍了一种方法，即利用长波红外高光谱成像来区分 12 种市售黑色塑料样品，包括 9 种不同的聚合物类型。光谱扫描仪包括一个扫描法布里-佩罗干涉仪和一个热像仪，热像仪基于对 8 μm 至 15 μm 波长敏感的非制冷微测辐射热计探测器。主成分模型与 k 近邻相结合，可区分高光谱图像中的塑料样品。该模型成功地对九种黑色聚合物中的五种（PET、POM、PMMA、PA6 和 PA66）进行了分类，模型的总体准确率为 A=73.1%。

引用次数: 0

Innovative 3D-printed devices for water pollutant removal: Comprehensive review on printing parameters, composition, properties and performances of the latest 3D-systems 用于去除水污染物的创新三维打印设备：全面回顾最新三维系统的打印参数、组成、特性和性能

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-11-01 DOI: 10.1016/j.polymertesting.2024.108627

Roberto Scaffaro , Maria Chiara Mistretta , Marta Balsamo

Water pollution is one of the most pressing problems of our time; in fact, it contributes to 24 % of global deaths. Therefore, finding an effective and efficient solution is crucially important. In this regard, systems based on polymers and containing, often, fillers, intended for potential water pollutant removal are well established. Recently, simultaneously with the impressive spread of 3D printing, the production of these systems by various additive manufacturing processes is gaining popularity, enabling the rapid production of complex geometries, high porosity, large surface area and mechanical strength. These systems, to date, are becoming particularly competitive with 2D or 1D systems produced by other methods, so understanding them fully is essential. Therefore, here we provide a review of the most recent advances in the field of manufacturing 3D systems for water remediation. First, a brief introduction is proposed on the cathegory of 3D printing, making a distinction between Material Extrusion (MEX) and non-Material Extrusion (non-MEX) systems, and the main performance parameters of water pollutant removal. Next, the process parameters, composition, and morphological and chemical-physical properties of the latest 3D systems are discussed in detail. In the last part, an overview is given of the functional properties of these systems, in terms of removal efficiency and reusability, which is crucial in an ideal life cycle of such systems. In conclusion, the main outcomes and future perspectives for the production of more efficient systems are provided.

水污染是当代最紧迫的问题之一；事实上，全球 24% 的死亡是由水污染造成的。因此，找到有效和高效的解决方案至关重要。在这方面，以聚合物为基础、通常含有填料、旨在去除潜在水污染物的系统已得到广泛认可。最近，随着三维打印技术的迅猛发展，通过各种增材制造工艺生产这些系统也越来越受欢迎，从而能够快速生产出具有复杂几何形状、高孔隙率、大表面积和机械强度的产品。迄今为止，这些系统与用其他方法生产的二维或一维系统相比尤其具有竞争力，因此全面了解它们至关重要。因此，我们在此回顾了用于水质修复的三维系统制造领域的最新进展。首先，简要介绍了三维打印的分类，区分了材料挤压（MEX）和非材料挤压（non-MEX）系统，以及去除水污染物的主要性能参数。接下来，详细讨论了最新三维系统的工艺参数、组成、形态和化学物理性质。最后，概述了这些系统在去除效率和可重复使用性方面的功能特性，这对此类系统的理想生命周期至关重要。最后，介绍了生产更高效系统的主要成果和未来展望。

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引用次数: 0

Advancing thermal stability in natural ester oil-paper insulation systems via precision nanostructuring with parylene films: Experimental and molecular-level comprehensive assessment 通过对二甲苯薄膜的精密纳米结构提高天然酯油纸绝缘系统的热稳定性：实验和分子水平综合评估

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-11-01 DOI: 10.1016/j.polymertesting.2024.108592

Feipeng Wang , Jian Zhou , Linyang Dan , Yihua Qian , Shi Li , Issouf Fofana , Massimo Pompili , Jian Li

The oil-paper insulation system in eco-friendly fire-retardant transformers depends on hydrophilic natural ester insulating oil. Moisture within the system synergistically interacts with aging, worsening oil-paper insulation degradation and hastening overall system aging. Chemical vapor deposition was used to create parylene surface-modified insulating paper as a strategy to inhibit moisture-induced aging in natural ester oil-paper insulation. The effectiveness of the approach was identified by a comprehensive assessment of the physicochemical and electrical properties of the parylene surface-modified insulating paper. The findings from accelerated thermal aging at 130 °C for 90 days on the natural ester oil-paper insulation system reveal the outstanding lipophilic and hydrophobic properties while maintaining electrical characteristics of the parylene surface-modified insulating paper. After 90 days of aging, the parylene surface-modified insulating paper exhibited a 56.76 % higher degree of polymerization and a 19.36 % significantly lower moisture content than conventional cellulose insulating paper. In the natural ester oil-paper insulation system, the parylene surface-modified insulating paper led to a notable 63 % reduction in insulating oil acid value, a 60.50 % decrease in dielectric loss, and a substantial 20.35 % increase in AC breakdown voltage. Molecular-level investigations revealed the inhibitory mechanism of the parylene film, offering a promising solution to enhance the thermal stability and aging resistance of natural ester oil-paper insulation systems.

环保型阻燃变压器中的油纸绝缘系统依赖于亲水性天然酯绝缘油。系统中的水分会与老化产生协同作用，加剧油纸绝缘降解并加速整个系统的老化。化学气相沉积法用于制造对二甲苯表面改性绝缘纸，作为抑制天然酯油纸绝缘受潮老化的一种策略。通过全面评估对二甲苯表面改性绝缘纸的物理化学和电气性能，确定了该方法的有效性。天然酯油纸绝缘系统在 130 °C 下加速热老化 90 天的结果表明，聚对二甲苯表面改性绝缘纸在保持电气特性的同时，还具有出色的亲油和憎水特性。经过 90 天的老化后，与传统的纤维素绝缘纸相比，聚对二甲苯表面改性绝缘纸的聚合度提高了 56.76%，含水量显著降低了 19.36%。在天然酯油纸绝缘系统中，聚对二甲苯表面改性绝缘纸显著降低了 63 % 的绝缘油酸值，降低了 60.50 % 的介电损耗，并大幅提高了 20.35 % 的交流击穿电压。分子水平的研究揭示了对二甲苯薄膜的抑制机理，为提高天然酯油纸绝缘系统的热稳定性和耐老化性提供了一种可行的解决方案。

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引用次数: 0

Corrigendum to “Intrinsic antibacterial photopolymerization 3D-printed thermosets from citronellol and cinnamyl alcohol: Synthesis and properties” [Polym. Test. 140 (2024) 108582] 香茅醇和肉桂醇的内在抗菌光聚合 3D 打印热固性塑料：合成与性能》[Polym. Test.

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-11-01 DOI: 10.1016/j.polymertesting.2024.108622

Yidong Wu , Dan Hong , Shijie Qi , Yi Fang , Yabin Zhu

引用次数: 0

Sustained release of heparin from PLLA micropartricles for tissue engineering applications 用于组织工程的聚乳酸微囊持续释放肝素

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-11-01 DOI: 10.1016/j.polymertesting.2024.108628

Mojdeh Rajabi , Iman Shabani , Seyed Hossein Ahmadi Tafti , Azadeh Shabani

Heparin holds promise for cardiac tissue engineering, but challenges such as hematoma or bleeding and accumulation in tissue caused by excessive release, and short half-life persist. The present study aimed to introduce a reliable mechanism for the prolonged heparin release from a biocompatible polymer carrier. The designed system must ensure that heparin retains its bioactivity over time while preventing premature release. Heparin was encapsulated within poly (L-lactic acid) microparticles using the double emulsion method, with polyvinyl alcohol employed as the stabilizer. The encapsulation efficiency of heparin in the microparticles was calculated as 25.56 %. The functionality of the design was evaluated using Attenuated Total Reflection Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy, and Energy Dispersive X-ray Spectroscopy. Drug release and microparticle degradation studies were conducted alongside cell viability tests. The particle sizes ranged from 5 to 10 ± 2.53 μm, with evidence suggesting that heparin promotes the smaller particle formation. The system demonstrated a consistent drug release profile over six weeks with a release rate of 54 % by week two and 97.65 % by week six. The degradation of heparin-loaded microparticles reached less than 50 % by week six, and the loading of heparin did not significantly affect the degradation behavior of the PLLA microparticles in PBS. Furthermore, heparin concentrations between 200 and 400 μg/ml enhanced the viability of Placenta-derived Mesenchymal Stem Cells and H9c2. These findings suggest that the system could be considered as an effective vehicle for sustained heparin delivery across a spectrum of biological applications, particularly in cardiac tissue engineering.

肝素在心脏组织工程中大有可为，但肝素过度释放导致的血肿或出血、组织内蓄积以及半衰期短等问题依然存在。本研究旨在引入一种可靠的机制，以延长肝素从生物相容性聚合物载体中的释放时间。所设计的系统必须确保肝素长期保持其生物活性，同时防止过早释放。采用双乳液法将肝素封装在聚（L-乳酸）微粒中，并使用聚乙烯醇作为稳定剂。经计算，肝素在微粒中的封装效率为 25.56%。使用衰减全反射傅立叶变换红外光谱仪、扫描电子显微镜和能量色散 X 射线光谱仪对设计的功能性进行了评估。在进行细胞活力测试的同时，还进行了药物释放和微粒降解研究。微粒的大小从 5 微米到 10 ± 2.53 微米不等，有证据表明肝素促进了较小微粒的形成。该系统在六周内表现出稳定的药物释放曲线，第二周的释放率为 54%，第六周为 97.65%。到第六周时，肝素负载微颗粒的降解率低于 50%，肝素负载对聚乳酸微颗粒在 PBS 中的降解行为没有显著影响。此外，肝素浓度在 200 至 400 μg/ml 之间时，可提高胎盘间充质干细胞和 H9c2 的存活率。这些研究结果表明，该系统可作为持续肝素递送的有效载体，应用于各种生物领域，尤其是心脏组织工程领域。

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引用次数: 0

Synthesis of phosphorus-containing modifier based on phenolic epoxy resin and its application in flexible poly(vinyl chloride)/magnesium hydroxide composites 基于酚醛环氧树脂的含磷改性剂的合成及其在柔性聚氯乙烯/氢氧化镁复合材料中的应用

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-11-01 DOI: 10.1016/j.polymertesting.2024.108634

Xue Li , Yongkui Zheng , Xinyi Bao , Jia Liu , Wenhui Liu , Xiaoyuan Liu , Li Dang

In this study, a phosphorus-containing and polyether structure modifier, phenolic epoxy phosphate ester (PEPE), was prepared by the reaction of phenolic epoxy resin (EPN) and phosphoric acid. It was used to solve the trade-off dilemma of simultaneously improving the mechanical properties and flame resistance of flexible poly (vinyl chloride) (fPVC)/magnesium hydroxide (MH) composites. The peak heat release rate, total heat release, peak smoke production rate, and total smoke production of the fPVC/MHPEPE-5 (PEPE modified MH as filler) composite were decreased by 35.31 %, 49.2 %, 40.42 %, and 27.26 %, respectively, in comparison with the fPVC/MH composite. More importantly, the fPVC/MHPEPE-5 composite passed V-0 rating in the UL-94 test, while the fPVC and fPVC/MH composite passed V-2 and V-1 rating. The presence of phosphorus compounds in the condensed phase promoted the formation of a dense char residue of the fPVC/MHPEPE-5 composite. Therefore, the heat and flammable volatiles cannot migrate between the substrate zone and the combustion zone. In the gas phase, the dilution effect of H₂O reduced the concentration of oxygen and combustible volatiles. The radicals quenching effect of the primary and secondary pyrolysis products of PEPE (such as PO· and PO₂·) with ·H and ·OH^. radicals played a crucial role in flame extinguishing and combustion termination. In addition, the scanning electron microscopy results showed that MHPEPE performed good compatibility with the fPVC matrix. The tensile and impact strength of the fPVC/MHPEPE-5 composite was 12.19 % and 19.26 % higher than that of the fPVC/MH composite, respectively.

本研究通过酚醛环氧树脂（EPN）和磷酸的反应制备了一种含磷聚醚结构改性剂--酚醛环氧磷酸酯（PEPE）。它被用来解决同时改善柔性聚氯乙烯（fPVC）/氢氧化镁（MH）复合材料机械性能和阻燃性能的两难问题。与 fPVC/MH 复合材料相比，fPVC/MHPEPE-5（PEPE 改性氢氧化镁作为填料）复合材料的峰值放热率、总放热率、峰值产烟率和总产烟量分别降低了 35.31 %、49.2 %、40.42 % 和 27.26 %。更重要的是，在 UL-94 测试中，fPVC/MHPEPE-5 复合材料通过了 V-0 评级，而 fPVC 和 fPVC/MH 复合材料则通过了 V-2 和 V-1 评级。冷凝相中磷化合物的存在促进了 fPVC/MHPEPE-5 复合材料形成致密的炭渣。因此，热量和易燃挥发物无法在基材区和燃烧区之间迁移。在气相中，H2O 的稀释作用降低了氧气和可燃挥发物的浓度。珠光聚醚的一次和二次热解产物（如 PO- 和 PO2-）与 -H 和 -OH 自由基的自由基淬灭效应在熄灭火焰和终止燃烧方面发挥了关键作用。此外，扫描电子显微镜结果表明，MHPEPE 与 fPVC 基体具有良好的相容性。fPVC/MHPEPE-5 复合材料的拉伸强度和冲击强度分别比 fPVC/MH 复合材料高 12.19 % 和 19.26 %。

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引用次数: 0

Effect of titanate coupling agent on antioxidant property and UV blocking property of PBAT/lignin composite films 钛酸酯偶联剂对 PBAT/木质素复合薄膜抗氧化性和紫外线阻隔性的影响

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-11-01 DOI: 10.1016/j.polymertesting.2024.108613

Honghuan Li , Jianping Ding , Yelzati Aytibeke , Liupeizhi Yuan , Yitong Jiang , Mamatjan Yimit

PBAT is the largest amount of biomass-degradable plastics on the market at present, and its application in related fields is limited due to its defects such as poor weather resistance. In this study, the surface modification of lignin by titanate coupling agent was realized by the melt extrusion reaction method of non-catalytic system, and the PBAT/cotton straw lignin composite film was prepared by melt blending and blow molding with PBAT at a certain ratio. The structure and properties of the specimens were analyzed before and after the artificial accelerated aging test using characterization means such as DSC, SEM, IR, transmittance and mechanical properties. The results showed that the tensile strength and elongation at break ratios of the composite film increased by 36.99 % and 34.31 %, respectively, compared with the pure PBAT film when the titanate coupling agent modified lignin was 10 %; the retained value of elongation at break of the specimen on the sixth day of thermo-oxidative light aging increased by 13.33 %; and the UV transmittance at 500 nm was reduced by 96.95 %; And through the comprehensive evaluation system of material stability, the temperature aging kinetic model was established and a temperature sensitivity analysis was performed, and it was found that the specimen with 10 % lignin content had a significant reduction in temperature sensitivity. The composite film developed in this study maintains the fully biodegradable properties of PBAT while introducing the characteristics of functional modifiers, which provides a new idea to broaden the application in the field of packaging and helps to reduce the production cost.

PBAT是目前市场上用量最大的生物质降解塑料，由于其耐候性差等缺陷，在相关领域的应用受到限制。本研究采用非催化体系的熔融挤出反应法实现了钛酸酯偶联剂对木质素的表面改性，并与PBAT按一定比例熔融共混吹塑制备了PBAT/棉秆木质素复合膜。利用 DSC、SEM、IR、透射率和力学性能等表征手段分析了人工加速老化试验前后试样的结构和性能。结果表明，当钛酸酯偶联剂改性木质素的比例为 10 % 时，复合薄膜的拉伸强度和断裂伸长率与纯 PBAT 薄膜相比分别提高了 36.99 % 和 34.31 %；热氧化光老化第六天试样的断裂伸长率保留值提高了 13.通过材料稳定性综合评价体系，建立了温度老化动力学模型，并进行了温度敏感性分析，发现木质素含量为10%的试样温度敏感性显著降低。本研究开发的复合薄膜既保持了 PBAT 的全生物降解特性，又引入了功能改性剂的特性，为拓宽其在包装领域的应用提供了新思路，并有助于降低生产成本。

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引用次数: 0