Progress in Organic Coatings最新文献_第7页

Graphene/polyaniline waterborne composite coatings for metallic bipolar plates 用于金属双极板的石墨烯/聚苯胺水性复合涂层

IF 6.5 2区材料科学

Progress in Organic Coatings Pub Date : 2024-10-01 DOI: 10.1016/j.porgcoat.2024.108829

{"title":"Graphene/polyaniline waterborne composite coatings for metallic bipolar plates","authors":"","doi":"10.1016/j.porgcoat.2024.108829","DOIUrl":"10.1016/j.porgcoat.2024.108829","url":null,"abstract":"<div><div>Waterborne composite coatings were formulated for protection of metallic bipolar plates. The challenges lied in two aspects, one was the confliction between high electrical conductivity and good corrosion protection properties; the other was the water dispersibility of the constituent phases. Water-solubility of polyaniline (PANI) were controlled by adding polystyrene sulfonic acid during the polymerization of aniline. Graphene was functionalized by p-aminobenzoic acid and <em>p</em>-phenylenediamine to enhance the compatibility with PANI, while keeping the electrical conductivity of graphene at around 169 S/cm. Upon in-situ polymerization of the functionalized graphene/PANI composites, the electrical conductivity varied significantly from 41 S/cm to 91 S/cm with the surface functionality of graphene. The composite coatings were prepared thereafter with functionalized graphene/PANI/carbon black on the surface of 316 L stainless steel by centrifugal spraying coating. The interfacial contact resistance of the coatings reached 4 mΩ·cm<sup>2</sup>, comparable to Au coatings, but the corrosion current density was 4.37 μA/cm<sup>2</sup> due to the existence of the hydrophilic groups in waterborne coatings, like amino groups and sulfonic acid groups. A post-treatment was carried out to consume some of the amino groups, so that the corrosion current density was decreased to 0.88 μA/cm<sup>2</sup>.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":null,"pages":null},"PeriodicalIF":6.5,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization and tribological performance of new epoxy coatings modified with sustainable ionic liquid-graphene nanolubricants 用可持续离子液体-石墨烯纳米润滑剂改性的新型环氧涂层的特性和摩擦学性能

IF 6.5 2区材料科学

Progress in Organic Coatings Pub Date : 2024-10-01 DOI: 10.1016/j.porgcoat.2024.108841

引用次数: 0

Non-isocyanate polyurethanes derived from carbonated soybean oil: Synthesis, characterization and comparison with traditional vegetable oil-based polyurethanes 碳酸大豆油衍生的非异氰酸酯聚氨酯：合成、表征及与传统植物油基聚氨酯的比较

IF 6.5 2区材料科学

Progress in Organic Coatings Pub Date : 2024-10-01 DOI: 10.1016/j.porgcoat.2024.108830

{"title":"Non-isocyanate polyurethanes derived from carbonated soybean oil: Synthesis, characterization and comparison with traditional vegetable oil-based polyurethanes","authors":"","doi":"10.1016/j.porgcoat.2024.108830","DOIUrl":"10.1016/j.porgcoat.2024.108830","url":null,"abstract":"<div><div>The polyaddition between carbonated vegetable oils and diamines to form non-isocyanate polyurethanes (NIPUs) has been highlighted as a safer and more sustainable alternative to traditional polyurethanes (PUs) synthesis. Although NIPUs exhibit a broad range of properties, research so far has been more focused on exploring their synthetic routes rather than on the evaluation of their performance <em>versus</em> traditional PUs in a given application making complicate to determine if NIPUs can be considered an efficient and plausible, in terms of performance, alternative to their fossil fuel-bases PUs counterparts. In this work, a series of carbonate soybean oil-based NIPUs (CSBO-NIPUs) have been prepared by polyaddition of CSBO with three different diamines (MBCHA, DAO and Primaine1074) yielding CSBO-NIPUs with bio-base content well above 73 %. The obtained CBSO-NIPUs exhibited glass transition temperatures between −29 °C and 21 °C, decomposition temperatures in the range of 261 °C to 304 °C, excellent impact resistance (>100 kg/cm<sup>2</sup>), soft pencil hardness (6B) and a polymeric network with up to 74 % cross-linking degree. The performance of the prepared CSBO-NIPUs was compared with PUs (found in the scientific literature) synthesized from vegetable oil-based polyols and diisocyanates by the traditional synthetic route. The comparison revealed that CSBO-NIPUs show comparable or superior potential than the vegetable oil-based traditional PUs in terms of thermal stability, impact resistance and cross-linking degree. In conclusion, the polyaddition process sustainability in line with Green Chemistry principles along with CBSO-NIPUs excellent thermal and impact resistance place these materials in a promising position a viable alternative to traditional PUs in the near future.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":null,"pages":null},"PeriodicalIF":6.5,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Weathering effect on the wear performance of epoxy powder coatings reinforced with calcium ion-exchanged amorphous silica 老化对用钙离子交换无定形二氧化硅增强的环氧粉末涂料磨损性能的影响

IF 6.5 2区材料科学

Progress in Organic Coatings Pub Date : 2024-10-01 DOI: 10.1016/j.porgcoat.2024.108837

{"title":"Weathering effect on the wear performance of epoxy powder coatings reinforced with calcium ion-exchanged amorphous silica","authors":"","doi":"10.1016/j.porgcoat.2024.108837","DOIUrl":"10.1016/j.porgcoat.2024.108837","url":null,"abstract":"<div><div>Epoxy coatings generally have poor performance when used for exterior applications. After having studied the corrosion benefits obtained with calcium ion-exchanged amorphous silica pigments, the possible weathering advantages they may provide to powder coatings are analyzed in this work for the first time. For that purpose, five epoxy-based powder coatings were studied: the as-received coating (AR), and four epoxy subjected to a hot mixing process with different amounts by weight of silica anticorrosive micropigments (0 %, 1, 2 and 3 %). All epoxy coatings were degraded by ultraviolet radiation with a xenon lamp for 250 h to determine their weathering resistance. The damage suffered by each coating was evaluated quantifying their FTIR spectra, considering the carbonyls and hydroxyls formed during this type of degradation. Subsequently, studies of plastic universal hardness and abrasive and erosive wear were carried out. The results obtained show that these functionalized coatings have better mechanical and wear performance than the commercial coating after xenon light exposure. This is coherent with the fact that the non-reinforced coatings have the greatest degradation both by hydrolysis and photodegradation. After the weathering process carried out, the 3 % coating proves to have the best abrasive and erosive wear performances. Thus, the calcium ion-exchanged silica particles allow the service life of UV exposed epoxy powder coating to be extended, not only because of their anti-corrosive character but also because of their weathering stabilization properties. These findings represent a significant advancement in improving the durability of epoxy powder coatings for exterior applications.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":null,"pages":null},"PeriodicalIF":6.5,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Insights into powder coating excellence: Unveiling the effects of particle-size distribution 洞察粉末涂料的卓越性能：揭示粒度分布的影响

IF 6.5 2区材料科学

Progress in Organic Coatings Pub Date : 2024-09-30 DOI: 10.1016/j.porgcoat.2024.108815

{"title":"Insights into powder coating excellence: Unveiling the effects of particle-size distribution","authors":"","doi":"10.1016/j.porgcoat.2024.108815","DOIUrl":"10.1016/j.porgcoat.2024.108815","url":null,"abstract":"<div><div>Particle-size distribution (PSD) significantly influences the performance of powder coatings. In this study, polyester-coating powders with similar median diameters (D<sub>50</sub>) but varying PSDs were prepared. The PSD was characterized by span and two self-defined parameters, <span><math><msub><mi>E</mi><mn>5</mn></msub></math></span> (vol% <span><math><mo><</mo></math></span>5 μm) and <span><math><msub><mi>E</mi><mn>80</mn></msub></math></span> (vol% <span><math><mo>></mo></math></span> 80 μm). The effects of PSD on the powder properties and film performances were investigated comprehensively, including static and dynamic powder flowability, deposition characteristics, deposition efficiency, inner film structure, appearances and film performances. When powder coatings had similar D<sub>50</sub> values, greater span values correlated with poor powder flowability, less compact deposition, and increased voids in the final films, resulting in inferior surface appearances and compromised performances. Moreover, <span><math><msub><mi>E</mi><mn>5</mn></msub></math></span> primarily influenced powder flowability, deposition efficiency, and powder occupancy. In contrast, <span><math><msub><mi>E</mi><mn>80</mn></msub></math></span> significantly impacts powder bridging in the deposition layer, thickness uniformity, appearance, and film performances. The above findings provide valuable insights for coating manufacturers to improve powder coating quality by optimizing PSD, paving the way for broader applications of powder coatings.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":null,"pages":null},"PeriodicalIF":6.5,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultraviolet-cured polyurea-polyurethane acrylate/polysiloxane hybrid anti-fouling coatings with superior mechanical properties, transparency, and durability 紫外线固化聚脲-丙烯酸聚氨酯/聚硅氧烷混合防污涂料，具有优异的机械性能、透明度和耐久性

IF 6.5 2区材料科学

Progress in Organic Coatings Pub Date : 2024-09-29 DOI: 10.1016/j.porgcoat.2024.108832

{"title":"Ultraviolet-cured polyurea-polyurethane acrylate/polysiloxane hybrid anti-fouling coatings with superior mechanical properties, transparency, and durability","authors":"","doi":"10.1016/j.porgcoat.2024.108832","DOIUrl":"10.1016/j.porgcoat.2024.108832","url":null,"abstract":"<div><div>The demand for rapidly preparing omniphobic liquid-like anti-fouling coatings has become increasingly important across a wide range of applications. However, achieving a rapid fabrication process that results in coatings with effective anti-fouling properties, alongside the comprehensive performance of the coatings such as hardness, flexibility, transparency, and abrasion resistance, remains a significant challenge. Herein, this paper proposes a synergistic strategy combining ultraviolet (UV) curing and organic/inorganic hybridization, which involves the rapid cross-linking of hyperbranched methacryloxypropyl polysiloxanes (HMO), polyurea-polyurethanes acrylate (SPUA) and bis-vinyl terminated polydimethylsiloxanes (PDMS-bvt) containing multiple double bonds under UV curing for just 60 s. Notably, HMO imparts excellent hardness (7H) and abrasion resistance, while SPUA enhances the coating's flexibility (2 mm bending diameter) and adhesion (5B). The anti-fouling properties of the coating are attributed to PDMS-bvt, which provides self-cleaning, anti-graffiti, and anti-fingerprint capabilities. Additionally, the coating's hydrophobicity and smooth surface significantly reduce ice adhesion strength (21.13 ± 6.9 kPa), offering a passive anti-icing effect. Furthermore, the coating exhibits excellent transparency, with a transmittance of >92 % in the visible region. The coating exhibits remarkable durability, maintaining its anti-fouling performance after exposure to mechanical abrasion (500 abrasion cycles and 1000 bending/release cycles), chemical corrosion (24 h of immersion in organic solutions), and UV aging (168 h). This strategy presents a fast and effective method for preparing multifunctional anti-fouling coatings, with potential applications on foldable screens, high-rise building glazing, and curved surfaces.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":null,"pages":null},"PeriodicalIF":6.5,"publicationDate":"2024-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rational design and preparation of the modified polyimide copolymer with superior anti-gamma irradiation 具有优异抗伽马辐照性能的改性聚酰亚胺共聚物的合理设计与制备

IF 6.5 2区材料科学

Progress in Organic Coatings Pub Date : 2024-09-29 DOI: 10.1016/j.porgcoat.2024.108838

{"title":"Rational design and preparation of the modified polyimide copolymer with superior anti-gamma irradiation","authors":"","doi":"10.1016/j.porgcoat.2024.108838","DOIUrl":"10.1016/j.porgcoat.2024.108838","url":null,"abstract":"<div><div>To improve polymer-based bonded solid lubricating materials with excellent anti-gamma irradiation performance, a polyimide (BPI, Polyimide containing hexafluoropropane 2,2-bis(3-amino-4-hydroxyphenyl)diamine monomer) copolymer containing phenolic hydroxyl and trifluoromethyl groups was synthesized based on a conventional two-step method. Comparative studies have been conducted to investigate the effects of gamma irradiation on microstructure, thermal stability, mechanical and tribological properties under the different irradiation dose conditions. The results show that, compared with the pure polyimide (PI) and corresponding coatings, the modified BPI copolymer and coatings have better gamma-ray irradiation resistance duo to the copolymer contains lots of the activated phenolic hydroxyl groups and fluorine, which could be effectively inhibit the active destruction of parts of chain structure of copolymer, resulted in the BPI copolymer and BPI based coatings possess good comprehensive mechanical and tribological properties after 1000 kGy gamma irradiation. This study provides a novel approach for the design and preparation of lubricating coatings for nuclear energy systems.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":null,"pages":null},"PeriodicalIF":6.5,"publicationDate":"2024-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Solvent-free epoxy coatings with enhanced cross-linking networks towards highly-efficient flame retardancy, water resistance and anticorrosion 具有增强型交联网络的无溶剂环氧涂料，可实现高效的阻燃、防水和防腐性能

IF 6.5 2区材料科学

Progress in Organic Coatings Pub Date : 2024-09-29 DOI: 10.1016/j.porgcoat.2024.108835

{"title":"Solvent-free epoxy coatings with enhanced cross-linking networks towards highly-efficient flame retardancy, water resistance and anticorrosion","authors":"","doi":"10.1016/j.porgcoat.2024.108835","DOIUrl":"10.1016/j.porgcoat.2024.108835","url":null,"abstract":"<div><div>Developing robust flame-retardant epoxy-based coatings that provide protection against fire, high temperatures, and prolonged exposure to wet environments remains a significant challenge. In this work, a facile and effective strategy is developed to enhance the cross-linking network and charring ability while reducing VOCs emissions in epoxy (EP) coatings. By exploiting a charring agent-derived active diluent, pentaerythritol glycidyl ether (PTGE), in combination with ammonium polyphosphate (APP) and EP, a solvent-free EP coating with enhanced flame retardancy, water resistance, and anticorrosion properties is constructed. With its low viscosity and multifunctionality, PTGE, anchored by four epoxy groups, reduces the coating's viscosity and strengthens the cross-linking network, thereby improving water resistance and anticorrosion properties, achieving an adhesion force that meets the ASTM 5B standard. The ring-opening of PTGE produces abundant hydroxy groups, and the synergistic effect of PTGE and APP provides excellent flame retardancy to wood, as evidenced by a limiting oxygen index of 29.2 % and a 40.0 % reduction in peak heat release rate. With the formation of a dense and hard char layer, the maximum back temperature of coated structural steel remains as low as 75 °C after 2600 s of flame exposure. This study provides a feasible strategy for constructing multifunctional, solvent-free, flame-retardant protective coatings.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":null,"pages":null},"PeriodicalIF":6.5,"publicationDate":"2024-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Blueprinted from nature: Duplicating the surface of Xanthosoma sagittifolium leaf on UV-curable electroactive polymethacrylate film through biomimicking technique for H2S gas sensing 来自大自然的蓝图：通过生物仿生技术在紫外固化电活性聚甲基丙烯酸酯薄膜上复制矢车菊叶表面，用于 H2S 气体传感

IF 6.5 2区材料科学

Progress in Organic Coatings Pub Date : 2024-09-28 DOI: 10.1016/j.porgcoat.2024.108836

{"title":"Blueprinted from nature: Duplicating the surface of Xanthosoma sagittifolium leaf on UV-curable electroactive polymethacrylate film through biomimicking technique for H2S gas sensing","authors":"","doi":"10.1016/j.porgcoat.2024.108836","DOIUrl":"10.1016/j.porgcoat.2024.108836","url":null,"abstract":"<div><div>This research introduces an innovative methodology for developing an H2S gas sensor utilizing bio-templated electroactive polymethacrylate (Bio-EPMA), achieved by integrating efficient and economical UV-curing technology with biomimicking. Drawing inspiration from the intricate surface structure of natural <em>Xanthosoma sagittifolium</em> leaves, the biomimetic template employed during synthesis is pivotal to this groundbreaking approach. Starting from the electroactive component, aniline tetramer (AT) was synthesized via an oxidative coupling reaction. Concurrently, the UV-cured monomer glycidyl methacrylate (GMA) underwent photopolymerization to form poly-GMA, which subsequently underwent an epoxide ring-opening reaction with the amino group of AT to yield EPMA. This base polymer was then meticulously tailored to feature a biomimetic surface morphology through the biomimicking technique, resulting in Bio-EPMA formation. Comprehensive analysis of the Bio-EPMA films showed remarkable hill microstructures and nanowrinkled surface morphology, with an enhancement of BET surface area from 5.7 m<sup>2</sup>/g to 20.4 m<sup>2</sup>/g and a 1.15-fold increase in reversible doping capacities. Following film fabrication, interdigitated electrode (IDE) sensors were coated with the synthesized biomimetic films for H<sub>2</sub>S gas sensing evaluations. Remarkably, the Bio-EPMA film demonstrated superior performance compared to non-biomimetic controls. This amplified performance is attributed to the increased surface area and bio-inspired structure of the Bio-EPMA film, which remarkably resulted in significant enhancements in responsivity by 36.2 % and repeatability with a relative standard deviation (RSD) improvement from 20.11 % to 3.62 %.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":null,"pages":null},"PeriodicalIF":6.5,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photoageing and durability of a polyester-melamine organic coating on steel: Influence of pigments and multiscale analysis 钢材聚酯-密胺有机涂层的光老化和耐久性：颜料的影响和多尺度分析

IF 6.5 2区材料科学

Progress in Organic Coatings Pub Date : 2024-09-26 DOI: 10.1016/j.porgcoat.2024.108834

{"title":"Photoageing and durability of a polyester-melamine organic coating on steel: Influence of pigments and multiscale analysis","authors":"","doi":"10.1016/j.porgcoat.2024.108834","DOIUrl":"10.1016/j.porgcoat.2024.108834","url":null,"abstract":"<div><div>This study investigates the influence of pigments on a polyester-melamine coating subjected to accelerated artificial photooxidative ageing using different scales of analysis (from molecular to macroscopic) with different techniques (IR, DSC, AFM, etc.) to gain broad insight into the material's degradation. The samples were studied in self-standing films and in coated steel plates with a coating thickness of 25 μm. Four formulations (with and without antioxidant, with and without pigments) were characterised, with a focus on the difference in behaviour between the degradation of the whole material and the degradation of the surface only under accelerated artificial photoageing. The data show that, regardless of the scale of analysis chosen, unpigmented formulations are degraded homogeneously, while pigmented formulations show significant degradation on the surface and relatively light degradation when the whole material is considered. This result signifies that the pigments show a retardant effect on the overall degradation of the coatings but have no retardant effect on the extreme surface of the samples. In addition, the different scales of analysis showed many similarities, which led to many correlations between them, including in cases where the effect of the pigment was considered.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":null,"pages":null},"PeriodicalIF":6.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142323044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0