Journal of Applied Polymer Science最新文献

{"title":"Ultralight activated carbon/polyimide foam with heterogeneous interfaces for improved thermal stability, mechanical properties, and microwave absorption","authors":"Jiayu Kang,&nbsp;Jingjing Cao,&nbsp;Wei Sun,&nbsp;Xinyu Xu","doi":"10.1002/app.56274","DOIUrl":"10.1002/app.56274","url":null,"abstract":"<p>The activated carbon (AC) has been widely used in the field of electromagnetic protection because of its porous, hollow microstructure and excellent electrical conductivity. In this paper, AC was prepared through KOH activation process. The ACs/polyimide foam (PIF) composite was prepared in situ during the synthesis of PI and the ACs. In this paper, AC was prepared using the potassium hydroxide (KOH) activation process. The AC/PIF composites were prepared by mixing ACs and pyromellitic dianhydride (PMDA) with methylene diphenyl diisocyanate (MDI). The pore structure and surface morphology of the ACs were observed using nitrogen adsorption–desorption isotherms and scanning electron microscopy (SEM). After KOH activation with KOH, the surface area and total pore volume of ACs significantly increased by 79.31% and 0.9539 cm³/g, respectively, mainly were the microporous structure. X-ray photoelectron spectroscopy (XPS) results confirmed an increase in the oxygen content of ACs after KOH activation, indicating an increase in the relative hydroxyl content on the surface. The SEM resulting of the ACs/PIF composite has a well-developed open cell structure. Thermal gravimetric analysis (TGA) revealed that ACs significantly improved the thermal stability of the ACs/PIF composite. The compressive strength of the ACs/PIF-3 increased from 518 to 834 KPa, significantly enhancing its mechanical properties. Simultaneously, the microwave absorption performance can be controlled and regulated by optimizing the impedance gradient of the skeleton. Results showed that when ACs constituted 8 wt% of the PIF, the real permittivity (<i>ɛ</i>′) and imaginary permittivity (<i>ɛ</i>″) of ACs-PIF-5 were approximately 2.03 and 0.025, respectively.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 47","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical and physical properties of flexible polyurethane foam filled with waste tire material recycles","authors":"Y. Nezili,&nbsp;I. El Aboudi,&nbsp;D. He,&nbsp;A. Mdarhri,&nbsp;C. Brosseau,&nbsp;M. Zaghrioui,&nbsp;T. Chartier,&nbsp;A. Ghorbal,&nbsp;R. Ben Arfi,&nbsp;J. Bai","doi":"10.1002/app.56282","DOIUrl":"10.1002/app.56282","url":null,"abstract":"<p>In this work we use ground tire rubber (GTR) powder obtained by grinding worn tire treads as reinforcer agent in flexible polyurethane (PU). Characterization of the microstructure of the as-received powder is achieved using a series of standard techniques including scanning electron microscopy (SEM), granulometry-laser, Fourier transform infrared spectroscopy (FTIR), and x-ray diffraction (XRD). To have complementary physical information the composition and thermal characteristics of the GTR powder, thermogravimetry analysis (TGA) is also performed. The set of these preliminary characterizations shows that the GTR powder particles can be used as reinforcing fillers. For the purpose of good compatibility with the PU matrix, the GTR powder is subjected to chemical treatments for reducing the impurities on the powder particles and to create functional groups at their surface. Subsequently, a series of GTR/PU composite samples are prepared with different weight fractions of GTR using free rising foam method. The GTR/PU composites are then characterized to assess the effect of the GTR content and their chemically pre-treatment on thermal stability, compression mechanical behavior as well as sound attenuation properties. Collectively, these results indicate a significant improvement of both thermal and mechanical properties of the GTR/PU composites compared to the pristine PU matrix. Furthermore, it is also emphasized that the sound absorption response shows a significant shift of the maximum of the absorption coefficient toward lower frequencies resulting from simultaneous increase in air-flow resistivity and tortuosity which can have great potential application in the field of underwater acoustics. The effects of chemical treatments and GTR amount are also discussed. It is also shown that the results show improvement when H₂O₂ solvent is used in comparison with NaOH, and the optimal properties are reached for PU samples containing 20 wt% of GTR whatever the pre-treatment is.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 48","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/app.56282","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of silica-loaded polydopamine-modified graphene oxide nanocomposites on the corrosion resistance of polyester coatings","authors":"Guoxin Ding,&nbsp;Jun Liu,&nbsp;Yuexiang Hu,&nbsp;Guojun Cheng,&nbsp;Chenfeng Sun,&nbsp;Yan Liu,&nbsp;Xiangxiang Chen","doi":"10.1002/app.56260","DOIUrl":"10.1002/app.56260","url":null,"abstract":"<p>On the basis of the complex environment of port terminals, the corrosion resistance of coatings for accompanying metal facilities is a primary factor that needs to be considered. This study prepared polydopamine-modified graphene oxide loaded with silicon dioxide (PGO@SiO₂) functional filler, which was incorporated into polyester resin (PR) by extrusion mixing. The PGO@SiO₂/PR composite coating was obtained by electrostatic spraying and high-temperature curing. Fourier transform infrared spectroscopy, x-ray diffraction, and other results confirmed the successful preparation of the PGO@SiO₂ functional filler. In addition, contact angle, adhesion, and corrosion resistance tests were performed on the composite coating. Compared with pure PR coating, the surface hydrophobicity and adhesion of the composite coating were significantly improved compared with the pure PR coating. Furthermore, the electrochemical impedance spectroscopy of the carbon steel substrate composite coating confirmed that after immersion in salt solution, the low-frequency impedance modulus of the composite coating could be maintained at 8.63 × 10⁸ Ω·cm², which was more than two orders of magnitude higher than that of the pure PR coating. Thus, PGO@SiO₂ could significantly enhance the corrosion resistance of the PR coating and hinder the infiltration of corrosive media. It has broad prospects for engineering applications because of its excellent anticorrosive performance.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 47","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative study on shape memory, mechanical, and thermomechanical properties of multi-walled carbon nanotubes and graphene nanoplatelets modified bidirectional (twill) carbon fiber polymer composites","authors":"Ritesh Gupta,&nbsp;Gaurav Mittal,&nbsp;Gajendra Kumar Nhaichaniya,&nbsp;Krishna Kumar,&nbsp;Upender Pandel","doi":"10.1002/app.56233","DOIUrl":"10.1002/app.56233","url":null,"abstract":"<p>The research conducts a comparative analysis of epoxy/bi-directional (twill) carbon fiber three-phase shape memory hybrid composites modified with MWCNT and GnP, examining their mechanical, thermomechanical, and shape memory properties. Fabrication involves preparing nanoparticle-modified epoxy nanocomposites through ultrasonication followed by hand layup technique. The findings revealed that the modified composites achieved their optimal performance at a 0.6 wt% concentration of nanoparticle, with the tensile strength and modulus increasing by 33.59% and 23.47% for 0.6 wt% MWCNT composite and by 45.94% and 25.61% for 0.6 wt% GnP composite. GnP-modified composites outperformed MWCNT ones due to GnP's sheet structure aligning parallel to the load and larger surface area facilitating enhanced interaction with the matrix. Despite polymer modification, the shape recovery ratio values remained high, with 98.92% for unmodified composite, 97.72% for 0.6 wt% MWCNT composites, and 97.12% for 0.6 wt% GnP modified composites, all exceeding 90%, indicating no compromise in performance.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 46","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel wastepaper nanocellulose/chitosan-based nanocomposite membrane for effective removal of the textile dye Congo red from aqueous solution","authors":"Rekha Goswami,&nbsp;Abhilasha Mishra,&nbsp;Adeeba Mirza,&nbsp;Waseem Ahmad,&nbsp;Rinku Rana","doi":"10.1002/app.56275","DOIUrl":"10.1002/app.56275","url":null,"abstract":"<p>Development of a cost-effective and environmentally friendly method to treat dye wastewater is of utmost importance. In this experimental study, wastepaper was used as the raw material for the extraction of cellulose nanocrystals to fabricate a nanocomposite membrane with chitosan. During the extraction process, acid hydrolysis (Sulfuric acid) followed by bleaching (hydrogen peroxide) was adopted. To confirm the nano-range, particle size analysis, and FESEM were performed, which confirmed the presence of particles in the nano-range ranging from 313.8 to 122.1 nm and FESEM observed results showed transformation of fibrous to rod shaped nanocrystals after acid hydrolysis. After successful nanocomposite fabrication a porous sieved network of membrane was observed and after adsorption successful adhesion of dye molecules over the membrane matrix was also confirmed. FTIR data showed that during adsorption mechanism some of the prominent peaks gets disappeared suggest interaction of dye molecules onto the nanocomposite. The contact angle of 21.0° was observed for the ChNC₃ nanocomposite showed super hydrophilic behavior. Tensile strength was also observed in terms of young's modulus, ultimate strength, and elongation at break. The elasticity and stiffness of a material are usually indicated by its young modulus. In AH CNCs and ChNC3, the young modulus was seen to be increasing from 195&lt; 693, respectively. On the other hand, the ultimate strength indicates AH CNCs and ChNC3 and shows a downward trend of 1.56&gt; 0.316, respectively. Furthermore, the potentiality of the nanocomposite membrane was analyzed for Congo red dye in synthetic wastewater prepared in the laboratory. During the batch study, various working parameters were taken such as initial dye solution (20–100 ppm), pH (1–7), contact time (10–60 min), and dosage (0.1–0.5 mg/L). To know about adsorption, Langmuir and Freundlich isotherm were analyzed it was observed that Freundlich isotherm show best fitted modeling with <i>R</i>² = 0.99, and <i>n</i> = 1.6 showing favorability of the heterogeneous adsorption. To determine the interaction between the adsorbate and adsorbent, pseudo first order and pseudo second order kinetics models were analyzed, and it was observed that chemisorption interaction followed between the adsorbate and adsorbent. Thermodynamic parameters were analyzed, which confirmed the spontaneous and favorable adsorption mechanism. To avoid fouling problems and maintain cost effectiveness, the resulting, nanocomposite membrane was desorbed using an appropriate solvent. After 5 cycles, the desorption rate decreased from 54% to 38%. This developed nanocomposite membrane appears to be effective in effluent waste treatment because of its simple formulation approach.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 47","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of Fe2O3/ZnFe2O4/g-C3N4@ZIF-8 composites: Enhancing thermal stability and flame retardancy in polyurea","authors":"Jiayu Lin,&nbsp;Yongbo Hou,&nbsp;Lailong Ding,&nbsp;Yifan Wang,&nbsp;Jinhu Hu,&nbsp;Xishun Qiu,&nbsp;Chao Wu,&nbsp;Mingliang Ma,&nbsp;Wei Gao","doi":"10.1002/app.56261","DOIUrl":"10.1002/app.56261","url":null,"abstract":"<p>Metal–organic frameworks (MOFs) have garnered significant attention in recent years due to their potential application in flame-retardant polymeric materials. In this work, Fe₂O₃/ZnFe₂O₄/g-C₃N₄@ZIF-8 flame retardants were synthesized via solvothermal and calcination techniques, and their elemental composition and morphologies were thoroughly characterized. The flame retardancy of polyurea (PUA) composites incorporating varying dosages of these flame retardants was evaluated using cone calorimetry tests (CCT). The findings demonstrate that the incorporation of Fe₂O₃/ZnFe₂O₄/g-C₃N₄@ZIF-8 significantly enhanced the flame retardant properties of PUA composites. With the addition of 3 wt% of the flame retardant, the peak heat release rate (PHRR), total heat release (THR), total smoke production (TSP), and total CO yield (TCO) of the PUA composites decreased to 890.82 kW/m², 131.34 MJ/m², 12.30 m², and 2.39 g, respectively, reflecting reductions of 33.59%, 18.59%, 29.40%, and 47.93% compared with pure PUA. The flame-retardant mechanism was systematically analyzed in both the condensed and gas phases. This study provides a robust experimental foundation and novel insights that contribute to the development of advanced flame-retardant coating materials.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 47","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scalable and low-cost lithium acetate / polyetherimide composite dielectrics exhibiting improved energy storage properties at high temperature","authors":"Xinyu Zhao,&nbsp;Yancheng Liu,&nbsp;Zhiguo Jia,&nbsp;Yunqi Xing,&nbsp;Mengjia Feng","doi":"10.1002/app.56266","DOIUrl":"10.1002/app.56266","url":null,"abstract":"<p>Polymer dielectrics with excellent energy storage properties are crucial for high-power density electronic equipment in environments such as high temperatures and strong electric fields. They play a critical role in applications including hybrid electric vehicles, electromagnetic launch devices, and photovoltaic power generation. In this paper, the small molecule compound lithium acetate (LiAc), which is low cost and exhibits good thermal stability in high-temperature environments, was selected and blended with a polyetherimide (PEI) polymer matrix at an ultra-low loading (≤0.3 vol%). LiAc has a higher electron affinity compared to PEI, which will result in a large trap energy level (<i>Φ</i>_e). The injected and excited electrons are trapped by strong electrostatic attraction, which suppresses carrier transport, reduces conduction losses, and improves breakdown strength in high-temperature environments. This composite dielectric exhibits better energy storage properties in high-temperature environments. The energy density of the 0.2% by volume LiAc/PEI composite dielectric reaches 3.04 J cm⁻³ at 150°C, maintaining an energy storage efficiency of approximately 90%. The research presented in this paper offers a novel approach to achieving excellent energy storage properties in polymer-based composite dielectrics operating in high-temperature environments.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 47","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diffusion and sorption of water vapor by polyamide-imides","authors":"Anatoly E. Chalykh,&nbsp;Tatiana F. Petrova,&nbsp;Vladimir V. Matveev,&nbsp;Uliana V. Nikulova","doi":"10.1002/app.56254","DOIUrl":"10.1002/app.56254","url":null,"abstract":"<p>The study of sorption and diffusion characteristics of glassy polymers based on polyamide-imides was carried out using the methods of static sorption, dilatometry, electron microscopy. Water sorption isotherms of polyamide-imides based on trimellitimido-N-acetic acid (PAI-A) and trimellitimido-N-p-benzoic acid (PAI-B) with different intramolecular ‘hinges’ in the diamine fragment were obtained. The isotherms are <i>S</i>-shaped and occupy an intermediate position between polyheteroarylenes and aliphatic polyamides. The dual sorption model was used to interpret the results. It is shown that the Langmuir component of the isotherms is determined by the thermal prehistory of glassy polymers, while the sorption component associated with water dissolution according to Flory-Huggins is determined by the chemical nature of the functional groups included in the monomeric unit. The diffusion coefficients of water and the temperature and concentration dependences of the diffusion coefficients of sorbed water molecules were determined.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 47","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142183671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of printed PVDF/GCN composite film thickness on the performance of piezoelectric nanogenerators","authors":"Omkar Y. Pawar,&nbsp;Sooman Lim","doi":"10.1002/app.56234","DOIUrl":"10.1002/app.56234","url":null,"abstract":"<p>This study aimed to explore the influence of film thickness on the piezoelectric efficiency of polyvinylidene fluoride/graphitic carbon nitrate nanosheet (GCN) composite films, taking into account the effect of GCN alignment. Our findings demonstrated that the piezoelectric performance of these films was markedly dependent on their thickness. We have observed a direct relationship between film thickness and piezoelectric efficiency, with thicker films showing a greater capability to convert mechanical pressure into electric energy. This increased efficiency is attributed to the enhanced ability to thicker films to distribute stress uniformly across the material, which is crucial for optimizing the piezoelectric effect. Our results advance the understanding of how variation in film thickness impact mechanical properties such as stiffness and flexibility, which subsequently affect the piezoelectric response. Through predictive modeling, we analyzed the mechanical dynamics of film displacement under an electrical potential and clarified how different thickness influenced the mechanical properties and piezoelectric output. This detailed analysis deepens the fundamental understanding of material design for optimal piezoelectric performance and underscores the critical role of film thickness in engineering application.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 46","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ionic liquid-polymeric membranes for CO2 separation: A new perspective on membrane integrity under pressure","authors":"Henrique Z. Ferrari,&nbsp;Bárbara Polesso,&nbsp;João Victor Gonzaga,&nbsp;Franciele Bernard,&nbsp;Guilherme Dias,&nbsp;Sandra Einloft","doi":"10.1002/app.56273","DOIUrl":"10.1002/app.56273","url":null,"abstract":"<p>Membrane-based CO₂ separation is a promising technology compared to traditional processes, presenting advantages such as superior energy efficiency and reduced operational costs. This study investigates the enhancement of CO₂/N₂ separation performance by incorporating ionic liquid [hmim][Tf₂N] into polysulfone membranes. The membranes were produced with 5, 10, and 20 wt% IL, and their permeability was measured at 25°C under pressures of 1 and 4 bar. Stability tests were also conducted. At 1 bar, the membrane with 20 wt% IL exhibited the highest CO₂ permeability of 342.27 Barrer, while the membrane with 5 wt% IL demonstrated the best ideal selectivity for CO₂/N₂ of 27.87. At 4 bar, the membrane with 5 wt% IL showed the highest ideal selectivity for CO₂/N₂ of 40.81, with a CO₂ permeability of 144.26 Barrer. Leaching tests indicated potential integrity loss in ionic liquid composite polymer membranes at high pressures. Specifically, the CO₂ permeability of the PSF-[hmim][Tf₂N] 5 wt% membrane increased continuously post-testing due to IL leaching. However, the performance of the membranes remained stable at lower pressures (1 bar). These findings suggest that the produced membranes achieve higher permeability, CO₂/N₂ selectivity, and CO₂ diffusivity, making them suitable for post-combustion gas separation applications.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 47","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}