ACS Applied Polymer Materials最新文献

{"title":"Side-Chain Polarity-Dependent Photoluminescence and Deep Blue Electroluminescence in Fluorene-Based Conjugated Polymer Networks","authors":"Anamika,&nbsp;Neelam Gupta,&nbsp;Dipanshu Sharma,&nbsp;Arpita Maurya,&nbsp;Anil Kumar,&nbsp;Jwo-Huei Jou* and Biplab Kumar Kuila*,&nbsp;","doi":"10.1021/acsapm.4c0379810.1021/acsapm.4c03798","DOIUrl":"https://doi.org/10.1021/acsapm.4c03798https://doi.org/10.1021/acsapm.4c03798","url":null,"abstract":"<p >The development of solution-processable deep blue electroluminescent materials has recently attracted considerable interest in organic light-emitting diode (OLED) research. Here, we report two solution-processable, highly fluorescent, and wide band gap conjugated polymer networks (CPNs) consisting of triazine and fluorene. Two different side chains, alkyl and ethylene glycol, are introduced into the polymer backbone to investigate the effect of side-chain polarity on the fluorescence and electroluminescence properties of the polymer. The thermal, photophysical, and self-assembly properties of the polymer were studied in detail, showing high thermal stability, side-chain polarity-dependent self-assembly, and fluorescence properties in the solid state. The polymer network with an alkyl side chain shows a deep blue color, whereas the ethylene glycol side chain displays a green color. Using these polymer networks, one can create fluorescence patterns of blue and green using UV light. OLEDs based on FCPN2 with an ethylene glycol chain show a maximum quantum efficiency (EQE) of 2.7%, which is much higher than the 0.5% displayed by FCPN1 with an alkyl side chain. FCPN2 exhibits a maximum brightness of 1458 cd/m² and a maximum current efficiency of 1.2 cd/A with deep blue emission. These findings underscore the potential of side-chain polarity to modify the fluorescence and improve the electroluminescence performance of conjugated polymer-based blue OLED devices.</p>","PeriodicalId":7,"journal":{"name":"ACS Applied Polymer Materials","volume":"7 9","pages":"5672–5683 5672–5683"},"PeriodicalIF":4.4,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Injectable Hydrogels Exhibiting Real-Time In Situ Reinforcement under Dynamic Mechanical Conditions","authors":"Wei Du,&nbsp;Weijun Ji,&nbsp;Zewen Jiao,&nbsp;Sidi Li,&nbsp;Xueping Li,&nbsp;Jin Zhao*,&nbsp;Xin Hou* and Xubo Yuan,&nbsp;","doi":"10.1021/acsapm.5c0080010.1021/acsapm.5c00800","DOIUrl":"https://doi.org/10.1021/acsapm.5c00800https://doi.org/10.1021/acsapm.5c00800","url":null,"abstract":"<p >Biocompatible injectable hydrogels hold significant promise for noninvasive and minimally invasive tissue defects filling and repair applications. However, many tissues are subjected to dynamic mechanical environments. The mechanical properties of hydrogels are significantly affected by long-term dynamic mechanical stimulation after injection. Therefore, when injectable systems are applied to tissue defects for its filling and repair, it is urgent to activate relevant mechanisms that compensate for this strength loss in situ. In this study, we designed and synthesized dibromocyclopropane force-responsive micelles, and combined with our previously proposed “microunit inheritance reformation” strategy, we synthesized injectable hydrogels capable of responding to dynamic force environments to achieve real-time in situ reinforcement for the first time. The system exhibits good injectability and biocompatibility with the reformed hydrogel after injection, effectively inheriting the mechanical properties of the parent hydrogel. The formed network can effectively transmit external dynamic mechanical signals to deform the micelles, which triggers the dibromocyclopropane group to break and open the ring and then cross-links with the hyaluronate preexisting in the hydrogel to strengthen the original network in situ. Taking a physically interacting hydrogel synthesized from NaSS and DMAEA-Q as a model, the strength of the reformed force-responsive hydrogel (as-reformed PA-E) enhanced to 1.7 times that of the original hydrogel after 7 days of prolonged high-frequency biomechanical stimulation at 100 Hz. Meanwhile, by replacing different parent hydrogels and inheriting their initial mechanical properties, the force-responsive injectable system could meet diverse mechanical demands, suggesting the universality of our present strategy. This study provides insights for the synthesis of injectable hydrogels used in noninvasive minimally invasive defect filling applications.</p>","PeriodicalId":7,"journal":{"name":"ACS Applied Polymer Materials","volume":"7 9","pages":"5766–5779 5766–5779"},"PeriodicalIF":4.4,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and Postmodification of High-Molecular-Weight Polythioether with Excellent Intrinsic UV-Shielding Performance","authors":"Min Yan,&nbsp;Xingyu Luo,&nbsp;Qiubo Wang,&nbsp;Xiaojuan Liao* and Meiran Xie*,&nbsp;","doi":"10.1021/acsapm.5c0024710.1021/acsapm.5c00247","DOIUrl":"https://doi.org/10.1021/acsapm.5c00247https://doi.org/10.1021/acsapm.5c00247","url":null,"abstract":"<p >As a main chain sulfur-rich polymer, polythioether can be applied as an optical material, but its current synthesis methods have drawbacks such as harsh conditions and low molecular weight, which have a negative impact on the synthesis and properties of polymers. Constructing a facile approach for synthesizing polythioether with a high molecular weight is highly desirable. Herein, thiocyanate was found to have the ability to initiate anionic ring-opening polymerization of episulfide in an open-vessel, and high-molecular-weight (<i>M</i>_n &gt; 140 kDa) polythioether with phenylacetonitrile pendants was produced. Knoevenagel reaction between the reactive methylene group and benzaldehyde bearing an electron-donating or -withdrawing group was used to introduce the conjugated side groups. The polythioether film exhibited a good tensile strength of 4.1 MPa and excellent intrinsic anti-UV performance with a superior UPF of 330.9. This work provided an effective approach for preparing functional polythioether and improving its UV-resistant properties by postmodification.</p>","PeriodicalId":7,"journal":{"name":"ACS Applied Polymer Materials","volume":"7 9","pages":"5510–5518 5510–5518"},"PeriodicalIF":4.4,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase Change Materials via H-Bonding Cross-Linking for Cold Energy Storage and Management","authors":"Yu Han,&nbsp;Qiang He*,&nbsp;Yuqun Fang,&nbsp;Jingkai Nie,&nbsp;Weinan Qin,&nbsp;Hao Liu and Kai Zhu,&nbsp;","doi":"10.1021/acsapm.4c0307010.1021/acsapm.4c03070","DOIUrl":"https://doi.org/10.1021/acsapm.4c03070https://doi.org/10.1021/acsapm.4c03070","url":null,"abstract":"<p >Phase change materials (PCMs) offer great potential for realizing zero-energy thermal management due to superior cold storage and stable phase change temperatures. However, the widespread use of PCMs is consistently impeded by issues such as liquid leakage and solid rigidity. Here, we present a simple yet effective strategy for developing highly flexible polymer-based phase change materials. Our approach involves creating a dual three-dimensional (3D) cross-linked network of acrylamide (AM) and sodium alginate (SA) within a poly(vinyl alcohol) (PVA) matrix. The synergy between H-bonds and AM-SA networks significantly enhances the mechanical strength, thermal stability, and leakage resistance of PVA@AM-SA. Our research offers a promising approach to designing phase change materials with both high latent heat capacity and exceptional mechanical strength, making them ideal for use in wearable thermal management applications.</p>","PeriodicalId":7,"journal":{"name":"ACS Applied Polymer Materials","volume":"7 9","pages":"5339–5347 5339–5347"},"PeriodicalIF":4.4,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eliminating Nonideal Transfer Characteristics of Polymer Field-Effect Transistors by Isoindigo-Based Molecular Electron Acceptors","authors":"Xuejun Qiu,&nbsp;Yu Tang,&nbsp;Shilong Shi,&nbsp;Yang Cai,&nbsp;Qiaoming Zhang*,&nbsp;Ping Deng* and Yanlian Lei*,&nbsp;","doi":"10.1021/acsapm.5c0013310.1021/acsapm.5c00133","DOIUrl":"https://doi.org/10.1021/acsapm.5c00133https://doi.org/10.1021/acsapm.5c00133","url":null,"abstract":"<p >High-mobility organic field-effect transistors (OFETs), particularly those based on donor–acceptor polymers, often exhibit nonideal transfer characteristics, limiting their practical applications. Doping these semiconductors with specifically designed organic molecular electron acceptors can effectively address these deficiencies. By employing isoindigo-based acceptors with appropriate electron-withdrawing groups as dopants in diketopyrrolopyrrole-thienothiophene-based OFETs, we achieve an outstanding transistor performance with ideal transfer characteristics. Comprehensive analyses using ultraviolet–visible absorption, X-ray diffraction, ultraviolet photoelectron spectroscopy, and electrical measurements demonstrate that <i>p</i>-dopants play crucial roles in enhancing electron transfer, reducing charge carrier traps, and lowering contact resistance, thereby eliminating the typical “double slope” and hysteresis in OFET transfer characteristics.</p>","PeriodicalId":7,"journal":{"name":"ACS Applied Polymer Materials","volume":"7 9","pages":"5448–5455 5448–5455"},"PeriodicalIF":4.4,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unusual Polyether Dissolution in Salt-Concentrated Ionic Liquid Electrolytes: Application to High-Performance Ion Gels for Lithium-Ion Batteries","authors":"Namie Ikeda,&nbsp;Yuna Deguchi,&nbsp;Saki Sawayama and Kenta Fujii*,&nbsp;","doi":"10.1021/acsapm.5c0043810.1021/acsapm.5c00438","DOIUrl":"https://doi.org/10.1021/acsapm.5c00438https://doi.org/10.1021/acsapm.5c00438","url":null,"abstract":"<p >In this study, we report an anomalous dissolution behavior of poly(ethylene glycol) (PEG) in bis(fluorosulfonyl)amide (FSA)-based ionic liquids (ILs) containing LiFSA salt. Although PEG is initially soluble in FSA-based ILs, it turns to be insoluble upon adding LiFSA salt (conventional salting-out effect). Surprisingly, further addition of LiFSA salt results in PEG redissolution, yielding transparent PEG/IL solutions with high LiFSA concentrations (unusual salting-in effect). Combined high-energy X-ray scattering and all-atom molecular dynamics simulations revealed the molecular mechanism underlying this phenomenon. (1) At low Li⁺ concentrations (<i>c</i>_Li), Li⁺ ions coordinate exclusively with PEG to form insoluble crown ether-type PEG–Li⁺ complexes with contracted polymer chains. (2) At high <i>c</i>_Li, the PEG structure changes drastically, forming shared PEG–Li⁺–FSA^– complexes. Here, Li⁺ ions act as solvation bridging sites between PEG and FSA^–, facilitating polymer chain expansion and redissolution of PEG (transparent solution). Leveraging this redissolution effect, we synthesized homogeneous ion gels using tetra-arm PEG (TetraPEG) as a prepolymer. The resulting TetraPEG ion gel exhibit high mechanical strength, liquid-like ionic conductivity, and reversible Li⁺ insertion/deinsertion at the graphite negative electrodes for lithium-ion batteries (LIBs).</p>","PeriodicalId":7,"journal":{"name":"ACS Applied Polymer Materials","volume":"7 9","pages":"5546–5555 5546–5555"},"PeriodicalIF":4.4,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsapm.5c00438","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Porous Polyketones with a Well-Defined 1,3,5-Triphenyloylbenzene Subunit via Cyclotrimerization of Enaminones for Gas Separations","authors":"Xiao-Dong He,&nbsp;Boya Kuang,&nbsp;Xiaohua Ma,&nbsp;Jin-Xiu Zhou* and Mu-Hua Huang*,&nbsp;","doi":"10.1021/acsapm.5c0051710.1021/acsapm.5c00517","DOIUrl":"https://doi.org/10.1021/acsapm.5c00517https://doi.org/10.1021/acsapm.5c00517","url":null,"abstract":"<p >Porous organic polymers (POPs) functionalized with carbonyl groups have attracted much attention not only due to the inherent properties of polyketones but also for their rich postfunctionalizations. However, the synthesis of porous polyketone is very limited, mainly through AlCl₃-mediated Friedel–Crafts acylation polymerization of aromatic hydrocarbons, which faced issues such as undefined polyacylation products, reactivity decreasing with polymerization going on, and the residual AlCl₃ in the polymers. In order to have a well-defined structure of porous polyketones to advance the research of porous materials, this Article developed cyclotrimerization polymerization of tris-enaminones to access a class of porous polyketones based on 1,3,5-triphenylacetylbenzene structural units named BIT-POP-80 ∼ BIT-POP-82, with a BET surface area up to 580 m² g^–1. Considering the affinity of the carbonyl group to CO₂, the as-synthesized porous polyketones were doped into the polysulfone matrix as a porous filler to make mixed matrix membranes (MMMs). It is found that the MMMs effectively improved the permeability of CO₂ by 150% as well as the gas pair selectivity of CO₂/CH₄. The cyclotrimerization polymerization of enaminones reported in this paper provided a powerful approach to functionalized porous polymer materials with well-defined structure.</p>","PeriodicalId":7,"journal":{"name":"ACS Applied Polymer Materials","volume":"7 9","pages":"5616–5623 5616–5623"},"PeriodicalIF":4.4,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tough and Recyclable Ethylene–Vinyl Acetate Elastomers Based on the Stress-Induced Phase Separation Strategy","authors":"Xiaoning Hou,&nbsp;Zhu Xia,&nbsp;Zhanwei Feng,&nbsp;Linyu Li,&nbsp;Hang Zheng and Chenxi Bai*,&nbsp;","doi":"10.1021/acsapm.5c0023610.1021/acsapm.5c00236","DOIUrl":"https://doi.org/10.1021/acsapm.5c00236https://doi.org/10.1021/acsapm.5c00236","url":null,"abstract":"<p >Ethylene–vinyl acetate rubber (EVM) is a high-performance elastomer widely used across various sectors including electronics, communications, energy, and transportation. However, its relatively low mechanical strength restricts broader applications. Introducing epoxy groups and employing cross-linking methods have proven effective in enhancing mechanical performance, but the formation of permanent cross-linked networks compromises the material’s recyclability and reprocessability, which conflicts with sustainable development principles. In this study, we synthesized ethylene–vinyl acetate–glycidyl methacrylate (EVGMA<i>x</i>) terpolymers with varying epoxy group content by incorporating a third monomer, followed by comprehensive structural characterization. Instead of conventional cross-linking, a recyclable ethylene–vinyl acetate elastomer with outstanding mechanical properties was developed by using a stress-induced phase separation (SIPS) strategy. Mechanical tests revealed that the samples achieved a tensile strength of 16.9 MPa, significantly surpassing that of recently reported ethylene–vinyl acetate-based polymers while maintaining an elongation at break of 305.8%. Additionally, the rapid dissolution in acetone and the stability of properties after multiple thermal reprocessing demonstrate the polymer’s excellent recyclability and reprocessability. The phase separation behavior was further examined using atomic force microscopy (AFM), scanning electron microscopy (SEM), and dynamic mechanical analysis (DMA), elucidating the underlying SIPS mechanism. Finally, a conductive ethylene–vinyl acetate elastomer was fabricated by incorporating multiwalled carbon nanotubes (MWCNTs), demonstrating the material’s potential as a strain sensor in flexible electronic applications.</p>","PeriodicalId":7,"journal":{"name":"ACS Applied Polymer Materials","volume":"7 9","pages":"5491–5500 5491–5500"},"PeriodicalIF":4.4,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Continuous Manufacturing Approach for Aligned PVDF Nanofiber Yarns with Enhanced Mechanical and Piezoelectric Properties.","authors":"Adaugo Enuka, Mohamad Keblawi, Emmet Sedar, Vince Beachley","doi":"10.1021/acsapm.5c00069","DOIUrl":"https://doi.org/10.1021/acsapm.5c00069","url":null,"abstract":"<p><p>Electrospun poly(vinylidene fluoride-<i>co</i>-hexafluoropropylene) (PVDF-HFP) nanofibers possess desirable mechanical and piezoelectric properties, making them promising candidates for smart textiles if they can be assembled into continuous yarns. This study presents a manufacturing approach that enables the production of electrospun PVDF-HFP nanofiber yarns using an automated parallel track system and an adjustable roll-to-roll collector. Results show that this approach has potential for PVDF yarn manufacturing on a commercial scale. Electrospun yarns have previously been fabricated with self-bundling methods, but current technologies are limited by production limitations such as the lack of tight control over assembly parameters and the absence of a postdrawing process. Postdrawing was applied here to individual fibers before yarn spinning to enhance fiber strength by over two times and yarn strength by 39%. The piezoelectrical performance of yarns was enhanced by up to 45% with postdrawing. Continuous PVDF-HFP yarns with specific strength approaching 50,000 N m/kg and a relative β phase content of 97% are promising candidates for piezoelectric nanofiber-based smart textiles, which can be integrated into various wearable devices and intelligent garments.</p>","PeriodicalId":7,"journal":{"name":"ACS Applied Polymer Materials","volume":"7 9","pages":"5429-5436"},"PeriodicalIF":4.4,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12070370/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interface-Reinforced Segregated Conductive Networks in HDPE via In Situ Polyaniline Polymerization on Edge-Oxidized Graphene","authors":"Qiang Liu,&nbsp;He Zhao,&nbsp;Yanbo Liu,&nbsp;Ling Zhang* and Chunzhong Li*,&nbsp;","doi":"10.1021/acsapm.5c0071210.1021/acsapm.5c00712","DOIUrl":"https://doi.org/10.1021/acsapm.5c00712https://doi.org/10.1021/acsapm.5c00712","url":null,"abstract":"<p >The development of segregated structures in conductive polymer composites (s-CPCs) represents a promising approach for attaining superior electrical properties at reduced filler concentrations, yet enhancing the mechanical properties of s-CPCs while maintaining their high conductivity remains a crucial challenge due to inadequate interfacial bonding and inherent microstructural imperfections. By in situ polymerization of polyaniline (PANI) fibers on the surface of highly conductive edge-oxidized graphene (EOG) nanosheets, an interface-reinforced segregated structure was constructed in polyethylene (HDPE)-based s-CPCs with good mechanical properties and high electrical conductivity through a simple mechanical mixing and compression molding method. The PANI interlayer effectively suppressed EOG aggregation and bridged insulating gaps within the segregated conductive network, significantly reducing the surface resistivity to 6.56 × 10³ Ω. Simultaneously, the surface-grafted PANI fibers facilitated HDPE molecular chain diffusion across interfaces, compensating for interfacial microdefects and enabling extraordinary ductility improvement, as evidenced by the elongation at break increased from 58% to 313%. This work provided a strategy for fabricating polyolefin-based s-CPCs with good mechanical properties and high electrical conductivity for applications.</p>","PeriodicalId":7,"journal":{"name":"ACS Applied Polymer Materials","volume":"7 9","pages":"5747–5756 5747–5756"},"PeriodicalIF":4.4,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}