Macromolecular Materials and Engineering最新文献_第6页

Flame Retardancy via in-Mould Coating and Durability of Flame Retardants After Mechanical Recycling in all-polyamide Composites Prepared by In Situ Polymerisation 原位聚合制备的全聚酰胺复合材料的模内涂层阻燃性和机械回收后阻燃剂的耐久性

IF 4.2 3区材料科学

Macromolecular Materials and Engineering Pub Date : 2024-12-08 DOI: 10.1002/mame.202400325

Zsófia Kovács, Andrea Toldy

{"title":"Flame Retardancy via in-Mould Coating and Durability of Flame Retardants After Mechanical Recycling in all-polyamide Composites Prepared by In Situ Polymerisation","authors":"Zsófia Kovács, Andrea Toldy","doi":"10.1002/mame.202400325","DOIUrl":"https://doi.org/10.1002/mame.202400325","url":null,"abstract":"Sustainable development requires that the structural materials can be easily recycled. The advantage of all-polyamide composites (APCs) is that the matrix and the reinforcing material come from the same material family and can be easily mechanically recycled. In the research, polyamide 6.6 (PA6.6) reinforced polyamide 6 (PA6) composites by anionic ring-opening polymerisation are prepared and created a flame retardant coating on their surface by in-mould coating. The thermal stability of the created flame retarded APCs is investigated by thermogravimetric analysis (TGA), and the flammability is tested by UL-94 test, limiting oxygen index (LOI) and mass loss type cone calorimetry (MLC). The coatings reduced the peak heat release rate (pHRR) by up to 49% and increased the residual mass after combustion. The flame retarded APCs are mechanically recycled with the addition of 50 mass% primary material, and their thermal properties and flammability are investigated. The most effective formulations fully preserved their ability to reduce pHRR, demonstrating the durability of flame retardant properties through multiple life cycles. In the case of the sample containing 3% phosphorus from hexaphenoxycyclotriphosphazene (HPCTP) and 4% expandable graphite (EG), the pHRR after recycling is reduced by 35% compared to primary APC without flame retardants.","PeriodicalId":18151,"journal":{"name":"Macromolecular Materials and Engineering","volume":"310 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mame.202400325","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143602388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

PLA Double-Spirals Offering Enhanced Spatial Extensibility 提供更强空间扩展性的 PLA 双螺旋结构

IF 4.2 3区材料科学

Macromolecular Materials and Engineering Pub Date : 2024-12-06 DOI: 10.1002/mame.202400208

Mohsen Jafarpour, Stanislav N. Gorb

{"title":"PLA Double-Spirals Offering Enhanced Spatial Extensibility","authors":"Mohsen Jafarpour, Stanislav N. Gorb","doi":"10.1002/mame.202400208","DOIUrl":"https://doi.org/10.1002/mame.202400208","url":null,"abstract":"Inspired by natural spiral curves, this study aims to present a strategy to find a compromise between extensibility and load-bearing capacity in structures made from polylactic acid (PLA) as a brittle material. Herein, four geometrically distinct double-spiral modules are fabricated using a three-dimensional (3D) printer and subjected to tension, in-plane sliding, and out-of-plane sliding to assess both their in-plane and out-of-plane mechanical performance. Subsequently, a modular spiral-based metastructure is developed and tested under tension in two different directions. The results show that the maximum extension of the modules under different loading scenarios varies from 9 to 86 mm, while their load-bearing capacity ranges between 18 and 78 N. These significant variations highlight the considerable influence of both geometry and loading conditions on the mechanical behavior of the double-spiral modules. Moreover, the 250% horizontal and 130% vertical extensibility of the metastructure emphasize the importance of the spatial orientation of the modules in determining the efficiency of spiral-based metastructures. This study suggests that double-spirals with adjustable mechanical properties, if designed rationally, can offer a promising strategy to address the limited deformability of materials like PLA, and when arranged in specific spatial configurations, they can contribute to the development of energy-dissipative metastructures with enhanced extensibility.","PeriodicalId":18151,"journal":{"name":"Macromolecular Materials and Engineering","volume":"310 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mame.202400208","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143831053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recycled PET Packaging Materials of Improved Toughness— Importance of Devitrification of the Rigid Amorphous Fraction 提高韧性的再生PET包装材料-刚性非晶部分脱硝的重要性

IF 4.2 3区材料科学

Macromolecular Materials and Engineering Pub Date : 2024-12-04 DOI: 10.1002/mame.202400219

Ferenc Ronkay, Dániel Gere, Emese Slezák, Edina Szabó, György Marosi, Katalin Bocz

{"title":"Recycled PET Packaging Materials of Improved Toughness— Importance of Devitrification of the Rigid Amorphous Fraction","authors":"Ferenc Ronkay, Dániel Gere, Emese Slezák, Edina Szabó, György Marosi, Katalin Bocz","doi":"10.1002/mame.202400219","DOIUrl":"https://doi.org/10.1002/mame.202400219","url":null,"abstract":"Degradation, a common problem faced during the processing of recycled poly(ethylene terephthalate) (PET), leads to significant embrittlement of the products, as a result of which the material loses its applicability. Increased crystallization rate of the short chains of recycled PET and obstructed mobility of the amorphous phase are the main causes of enhanced brittleness. In this research, a straightforward method is proposed for improving the toughness of recycled PET products, namely the devitrification of the rigid amorphous phase by thermal annealing, which results in enhanced molecular mobility in the amorphous fraction, thereby promoting ductile deformation. The effects of thermal annealing conditions are comprehensively evaluated on the microstructure and macroscopic properties, i.e., impact resistance, of recycled PET films. The perforation energy value of the recycled PET film is found to increase to its threefold, reaching a value higher than 18 J mm−1, as a result of 10 s thermal treatment at 120 °C. Differential scanning calorimetry, dynamic mechanical analyses, and thermally stimulated depolarization current measurements provide evidence for the devitrification of the rigid amorphous fraction under these conditions, which is the key to efficient enhancement in toughness.","PeriodicalId":18151,"journal":{"name":"Macromolecular Materials and Engineering","volume":"310 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mame.202400219","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploiting Response Surface Methodology to Engineer the Mechanical Properties of Alginate-based Hydrogels 利用响应面法设计海藻酸盐基水凝胶的力学性能

IF 4.2 3区材料科学

Macromolecular Materials and Engineering Pub Date : 2024-12-02 DOI: 10.1002/mame.202400296

Alessio Bucciarelli, Chen Zhao, Xue Bai, Rebekah Kay, Ayşe Latif, Kaye J. Williams, Annalisa Tirella

{"title":"Exploiting Response Surface Methodology to Engineer the Mechanical Properties of Alginate-based Hydrogels","authors":"Alessio Bucciarelli, Chen Zhao, Xue Bai, Rebekah Kay, Ayşe Latif, Kaye J. Williams, Annalisa Tirella","doi":"10.1002/mame.202400296","DOIUrl":"https://doi.org/10.1002/mame.202400296","url":null,"abstract":"Engineering human tissue microenvironments that recapitulate the composition and biomechanics of extracellular matrix (ECM) in vitro is challenging. New mechanically tunable alginate-based hydrogels are presented, enabling to precise model multiple ECM features in the context of breast cancer. Combining alginate, oxidized alginate (OA), and gelatin with different crosslinking strategies a library of mechanically controlled hydrogels supporting human cell growth (MDA-MB-231) is obtained. The compressive moduli and stability of alginate-based hydrogels are characterized and modeled using a response surface methodology (RSM); this enables to selection of precision-hydrogels decoupling their biochemical composition with mechanical properties (1–30 kPa). Specific alginate-based hydrogels are selected as enhanced technologies to model breast-specific microenvironments in vitro to study the impact of biomechanical and biochemical properties on cell behavior. Doxorubicin is selected as a model drug and as first-line treatment for breast cancer to investigate the correlation between drug efficacy and breast tumor ECM stiffness. Results demonstrate that doxorubicin is less effective (EC50 0.495 µm vs EC50 0.189 µm) in cells cultured in softer hydrogels (6.9 kPa) than in stiffer (21.0 kPa). In the context of breast cancer, engineered hydrogels prove valuable technologies to model tissue-specific ECM in vitro for biological studies, advancing understanding of therapeutic response and resistance.","PeriodicalId":18151,"journal":{"name":"Macromolecular Materials and Engineering","volume":"310 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mame.202400296","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Harnessing Nature-Derived Sustainable Materials for Electrochemical Energy Storage: Unveiling the Mechanism and Applications 利用自然衍生的可持续材料进行电化学储能：揭示其机理和应用

IF 4.2 3区材料科学

Macromolecular Materials and Engineering Pub Date : 2024-11-30 DOI: 10.1002/mame.202400129

Naman Sharma, Kirti Mishra, Nirankar Singh, Samarjeet Singh Siwal, Phil Hart, Vijay Kumar Thakur

{"title":"Harnessing Nature-Derived Sustainable Materials for Electrochemical Energy Storage: Unveiling the Mechanism and Applications","authors":"Naman Sharma, Kirti Mishra, Nirankar Singh, Samarjeet Singh Siwal, Phil Hart, Vijay Kumar Thakur","doi":"10.1002/mame.202400129","DOIUrl":"https://doi.org/10.1002/mame.202400129","url":null,"abstract":"Recently, research all over the world is being carried out to develop eco-friendly supercapacitors (SCs) using biopolymeric materials like proteins or polysaccharides. These polymers offer these innovative energy storage devices' sustainability and recyclability, flexibility, lightweight, and steady cycling performance—all crucial for utilizations involving wearable electronics and others. Given its abundance and extensive recycling behavior, cellulose is one of the most sustainable natural polymers requiring special attention. The paper discusses the various types of cellulose-based materials (CBMs), including nanocellulose, cellulose derivatives, and composites, as well as their synthesis methods and electrochemical properties. The review also highlights the performance of CBMs in SC applications, including their capacitance, cycling stability, and rate capability, along with recent advances in modifying the materials, such as surface modification and hybrid materials. Finally, the proposed topic is concluded with the current challenges and future prospects of CBMs for SC applications.","PeriodicalId":18151,"journal":{"name":"Macromolecular Materials and Engineering","volume":"310 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mame.202400129","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143121237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing Sensitivity of Piezoresistive Pressure Sensor at Low Pressures Using Photo-Sensitive Resin Plate as Flexible Substrate 利用光敏树脂板作为柔性基板提高压阻式压力传感器在低压下的灵敏度

IF 4.2 3区材料科学

Macromolecular Materials and Engineering Pub Date : 2024-11-30 DOI: 10.1002/mame.202400237

Ferdos Akrami, Samaneh Hamedi

{"title":"Enhancing Sensitivity of Piezoresistive Pressure Sensor at Low Pressures Using Photo-Sensitive Resin Plate as Flexible Substrate","authors":"Ferdos Akrami, Samaneh Hamedi","doi":"10.1002/mame.202400237","DOIUrl":"https://doi.org/10.1002/mame.202400237","url":null,"abstract":"In this paper, flexible highly sensitive piezoresistive pressure sensors for low compressive stress detection (9.8 Pa to 10.7 kPa) are proposed, by using Photo-Sensitive Resin Plate (PSRP). The photolithography method is employed to create the micro-dome structure pattern on PSRP. Finally, the active parts of the sensors are made by depositing a thin layer of silver (Ag), as the sensing element, on the micro-dome patterns. Herein, the effect of three different surface pattern dimensions as well as two different thicknesses of the Ag layer on sensor sensitivity are evaluated. The sensor fabricated with a diameter of 300 µm for micro-dome structure, and 70 nm for the thickness of Ag layer demonstrated ultrahigh sensitivity of 29343 and 5 × 106 kPa−1 in the pressure ranges of 0.2–5 and 5–10.7 kPa, respectively. The sensor with a diameter of 300 µm for micro-domes and an Ag-thickness layer of 100 nm has a low working voltage of 0.1 V, a high sensitivity of 223.69 kPa−1 in the pressure range <0.11 kPa, and lowest limit of detection 9.8 Pa. The response and recovery times of this sensor are 270 and 60 ms, respectively. Furthermore, the sensor maintained high and stable performance over a 17-min period.","PeriodicalId":18151,"journal":{"name":"Macromolecular Materials and Engineering","volume":"310 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mame.202400237","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Effect of Reprocessing and Moisture on Polyamide Recycling: A Focus on Neat, Composites, and Blends 再加工和水分对聚酰胺回收的影响：聚焦于整齐、复合和共混

IF 4.2 3区材料科学

Macromolecular Materials and Engineering Pub Date : 2024-11-30 DOI: 10.1002/mame.202400304

Johanna Morales, Denis Rodrigue

引用次数: 0

Highly Performing Polysaccharide Hydrogels can Replace Acrylic Acid-Based Superabsorbent Polymers in Sanitary Napkins 高性能多糖水凝胶可替代丙烯酸基高吸水性聚合物用于卫生巾

IF 4.2 3区材料科学

Macromolecular Materials and Engineering Pub Date : 2024-11-27 DOI: 10.1002/mame.202400278

Saeed Ismaeilimoghadam, Bahareh Azimi, Mehdi Jonoobi, Serena Danti

{"title":"Highly Performing Polysaccharide Hydrogels can Replace Acrylic Acid-Based Superabsorbent Polymers in Sanitary Napkins","authors":"Saeed Ismaeilimoghadam, Bahareh Azimi, Mehdi Jonoobi, Serena Danti","doi":"10.1002/mame.202400278","DOIUrl":"https://doi.org/10.1002/mame.202400278","url":null,"abstract":"Super absorbent polymers (SAPs) used in sanitary napkin are not required for water absorption capacity as high as in baby diapers and adult incontinence pads. Sanitary napkins must absorb menses, which is delivered at a significantly lower rate and overall daily amount than urines. Thus, the acrylic acid (AA) component can not be strictly necessary. By proper formulation design and processing, polysaccharide SAPs can be equally or even better performing than AA-containing SAPs in sanitary napkins. Fully biodegradable sodium alginate (SA)-based SAPs are prepared through ionic cross-linking by CaCl2 and introduced in female pads. The optimal solution concentrations (SA 8% w/v, CaCl2 0.25% w/v in water) and reaction time are identified, and addition of cellulose nanocrystals (CNC) at different weight contents (0–3 w%) is tested. Morphology, physico-chemical properties, rheology, free swelling capacity (FSC), centrifuge retention capacity, and weight loss in soil are assessed. Increasing CNC content decreases FSC. Rheology results demonstrate higher storage and loss moduli for SA-based SAPs versus commercial SAPs. The superior SA-SAP developed is used in varying amounts for manufacturing sanitary napkin prototypes, revealing that excellent menstrual fluid absorption, surpassing commercial pads. Replacing AA-based with polysaccharide-based SAPs would reduce the environmental impact of hygienic product waste.","PeriodicalId":18151,"journal":{"name":"Macromolecular Materials and Engineering","volume":"310 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mame.202400278","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143602536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electroconductive Gelatin/Alginate/ Graphene Hydrogel Based Scaffold for Neural Tissue Repair 导电明胶/海藻酸盐/石墨烯水凝胶神经组织修复支架

IF 4.2 3区材料科学

Macromolecular Materials and Engineering Pub Date : 2024-11-27 DOI: 10.1002/mame.202400229

Pegah Madaninasab, Mahshid Mohammadi, Sheyda Labbaf

{"title":"Electroconductive Gelatin/Alginate/ Graphene Hydrogel Based Scaffold for Neural Tissue Repair","authors":"Pegah Madaninasab, Mahshid Mohammadi, Sheyda Labbaf","doi":"10.1002/mame.202400229","DOIUrl":"https://doi.org/10.1002/mame.202400229","url":null,"abstract":"A composite polymeric scaffold of gelatin/alginate /graphene is fabricated through freeze-drying technique. Initially, a hydrogel system comprised of gelatin/alginate (1:1) is prepared, and then the effect of different amounts of graphene carboxyl nanosheets (1,1.5, 2, and 2.5 wt.%) on the resultant structural properties are thoroughly evaluated. The swelling ratio, biodegradability, electrical and mechanical properties of bio-composite hydrogels are controlled by manipulating the concentration of graphene-COOH. The significant increase in the electrical conductivity is observed with the addition of 2.5% graphene-COOH, and the electrical conductivity increased from 8.525 × 10−7 ± 0.01 S cm−1 to 7.644 × 10−4 ± 0.04 S cm−1. Also, the biocomposite hydrogels exhibited compressive and tensile strength ranging from 25 to 382 KPa and 11.4 to 148 KPa with an increase in the concentration of graphene-COOH. The simplicity, low cost, tunable mechanical properties, and optimal electrical conductivity of the hydrogel system presented in this study highlight its potential as nerve tissue replacement.","PeriodicalId":18151,"journal":{"name":"Macromolecular Materials and Engineering","volume":"310 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mame.202400229","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143120070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

MOFs and MOF-Based Composites for the Adsorptive Removal of Ciprofloxacin mof及其基复合材料吸附去除环丙沙星的研究

IF 4.2 3区材料科学

Macromolecular Materials and Engineering Pub Date : 2024-11-27 DOI: 10.1002/mame.202400238

Sriyanjali Bathula, Swathi Thottathil, Yashoda Malgar Puttaiahgowda

{"title":"MOFs and MOF-Based Composites for the Adsorptive Removal of Ciprofloxacin","authors":"Sriyanjali Bathula, Swathi Thottathil, Yashoda Malgar Puttaiahgowda","doi":"10.1002/mame.202400238","DOIUrl":"https://doi.org/10.1002/mame.202400238","url":null,"abstract":"In spite of greater efforts to address antibiotic resistance, Ciprofloxacin (CIP) buildup in the aqueous medium continues to rise. The negative effects of CIP on the environment can be minimized through a comprehensive understanding of the technological advancements in removal techniques. The exploration of adsorbents like metal–organic frameworks (MOFs), activated carbon, porous organic polymers, etc., have found major usage in the adsorptive removal of antibiotics to tackle contamination. This study aims to compare the MOF-based adsorbents and provide a guide to developing such materials for the successful removal of CIP. The isotherm models of the adsorbents are studied using Langmuir, Freundlich, Temkin, and Sips isotherms. Furthermore, pseudo-second-order, pseudo-first order, intra-particle diffusion, and Elovich models are used to study the kinetic models. The major mechanisms of adsorption, such as π–π interactions, H-bonding, electrostatic interactions, hydrophobic interactions, and pore filling, are also analyzed. This study contributes to the future scope for the development of these MOFs for further exploration and applications in environmental remediation.","PeriodicalId":18151,"journal":{"name":"Macromolecular Materials and Engineering","volume":"310 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mame.202400238","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143120090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0