Polymer最新文献

{"title":"Enhanced optical and UV shielding performance of CoFe2O4@GONDs embedded PVA nanocomposites","authors":"Veda Bandigowdanahalli Prabhuswamy ,&nbsp;Kumara Swamy Ningappa ,&nbsp;Madhukar Beejaganahalli Sangameshwar ,&nbsp;Bharath Kumar Sobandhar Prakash ,&nbsp;Kavya Rajanna ,&nbsp;Mahesh Basavaraju ,&nbsp;Sangamesha Madanahalli Ankanathappa","doi":"10.1016/j.polymer.2025.129137","DOIUrl":"10.1016/j.polymer.2025.129137","url":null,"abstract":"<div><div>Herein, cobalt ferrite-graphene oxide nanodot heterojunctions (CoFe₂O₄@GONDs) were synthesized via a hydrothermal route and incorporated into a polyvinyl alcohol (PVA) matrix using solution casting to develop nanocomposites with filler contents ranging from 0.0wt% to 2.0 wt%. Comprehensive structural and morphological analyses were performed using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HR-TEM). These characterizations confirmed homogeneous dispersion of CoFe₂O₄@GONDs within the PVA polymer matrix and strong interfacial bonding, which facilitated structural stability. Optical characterization through UV–Visible spectroscopy demonstrated enhanced absorption in the UVB and UVC regions (240–315 nm), with an increase in absorption intensity as the filler loading was increased. The optical band gap narrowed to 3.79 eV, accompanied by a reduction in Urbach energy to 0.32 eV, indicating improved structural order and decreased defect density. Key linear optical constants, including refractive index, extinction coefficient, and optical conductivity, were extracted from absorption spectra, while dispersion analysis revealed a zero-frequency dielectric constant of 3.52. The calculated third-order nonlinear susceptibility (χ³) was 2.15 × 10⁻⁸ esu, indicating robust nonlinear optical activity. These findings underscore the suitability of PVA/CoFe₂O₄@GOND nanocomposites for next-generation photonic, optoelectronic, and UV-shielding applications.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"339 ","pages":"Article 129137"},"PeriodicalIF":4.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145127926","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":"Novel composite microcapsule for Karstedt catalyst: a latent green one based on organic gum for curing silicone rubber at medium temperature","authors":"Yumeng Wang,&nbsp;Yuze Zhou,&nbsp;Jiaying Lei,&nbsp;Tengling Ye,&nbsp;Dongyan Tang","doi":"10.1016/j.polymer.2025.129108","DOIUrl":"10.1016/j.polymer.2025.129108","url":null,"abstract":"<div><div>In response to issues such as high curing temperatures (100–200°C), degradation of product color, and insufficient process controllability in traditional addition-curing silicone rubber systems caused by catalyst inhibitors, this study proposed a novel green modification strategy based on microcapsule technology. Through the use of a composite aggregation technique, an innovative microcapsule system was successfully developed, utilizing gelatin (GE)/octenyl succinic anhydride-modified gum arabic (OSA-GA) as the shell and Karstedt catalyst as the core. The composition of the wall provided dual advantages: effectively preventing the pre-reaction between the catalyst and the matrix, which would significantly extend the storage time at room temperature from 40 min to 20 h, and enable a significant reduction in curing temperature based on the specific softening temperature of the wall (at 60°C). The research methodically examined the impact of process parameters on the morphology and functionality of the microcapsules, and verified via Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA) that the microcapsules featured consistent core-shell structure and superior thermal response properties. The microencapsulated system could reduce the curing temperature to 60°C while maintaining the mechanical properties of silicone rubber, without introducing toxic substances. The study provided a valid strategy for developing environmentally friendly, room-temperature-stable silicone rubber systems and hold significant application values.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"339 ","pages":"Article 129108"},"PeriodicalIF":4.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145134551","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":"Magnetic amine–modified pitch–based hypercrosslinked polymers for high–efficiency adsorption of phenolic pollutants","authors":"Xinxiu Cao ,&nbsp;Xinfu Lei ,&nbsp;Ruiyuan Wang ,&nbsp;Hongwei Zhao ,&nbsp;Shaohui Xiong ,&nbsp;Huanhuan Zhai ,&nbsp;Danyu Zhang ,&nbsp;Hui Fan ,&nbsp;Qingquan Liu","doi":"10.1016/j.polymer.2025.129138","DOIUrl":"10.1016/j.polymer.2025.129138","url":null,"abstract":"<div><div>Porous organic polymers (POPs) are promising materials for the adsorption of phenolic pollutants in wastewater due to their advantages including high surface area, tunable pore structure, easy to surface chemical functionalities, good physicochemical stability, <em>etc</em>. However, understanding the adsorption mechanism and realizing POPs with combined properties including low–cost, recyclable and high–efficiency remain challenges. In this work, four magnetic amine–modified pitch–based hypercrosslinked polymers (MAPHCPs) with different aniline (PA) content, PP, PP_0.8PA_0.2, PP_0.6PA_0.4 and PP_0.4PA_0.6, were synthesized and studied. All MAPHCPs demonstrated good thermostability and magnetic recyclability. With increasing PA content, the specific surface area decreased, while the pore sizes were similar. However, the calculated maximum adsorption capacity of the four phenolic pollutants onto PP_0.4PA_0.6 was between 47 % and 129 % higher than that of PP. The theoretical analysis and experimental results suggest that the acid-base interaction is the primary cause, with the dipolar and hydrogen bonding interactions as secondary causes for these improvements. This work not only demonstrates an approach for the preparation of low-cost, recyclable and high–efficiency POPs for the adsorption of phenolic pollutants, but also clarifies the combined mechanisms of chemical adsorption and physical adsorption.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"339 ","pages":"Article 129138"},"PeriodicalIF":4.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145134176","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":"Harmonizing dual electrospun/sponge structures within a triad gellan gum/eucalyptus/Cu-doped baghdadite composition for bone tissue engineering","authors":"Wei Sun ,&nbsp;Zaijun Wang ,&nbsp;Xiangnan Jin ,&nbsp;Hui Zhao ,&nbsp;Qiang Fu ,&nbsp;Jian Wang","doi":"10.1016/j.polymer.2025.129126","DOIUrl":"10.1016/j.polymer.2025.129126","url":null,"abstract":"<div><div>Bone tissue engineering strives to leverage successful material designs to regenerate highly innervated structures of bone. Biocomposites that combine both nano- and micro-scale porosities offer a promising approach in this field. Herein, we developed a gellan gum-based sponge covered with electrospun gellan gum fibers as a bilayer bone scaffold. To improve its functionality, we added eucalyptus extract and enriched the electrospun coating with copper-doped baghdadite. The results displayed coating of the sponge's micropores (157 ± 71 μm) with the fine fibers (424 ± 222 nm). Loading 6 wt % copper-doped baghdadite enhanced hydrophilicity, lowering the contact angle by 10° and increasing the swelling ratio to 55.79 %. Mechanical investigation revealed a two-phase tensile transition, highlighting the benefits of sponge and fibers in a single architecture, with a compressive strength of 383.01 kPa. Embedding fillers caused a significant enhancement in the antibacterial performance and inclined the antioxidant activity up to 97.53 %. Although eucalyptus inhibited the MG63 cell growth and attachment regarding its high antioxidant activity, loading 6 wt % Cupper-doped baghdadite created favorable conditions for cellular behavior on both sponge and electrospun surfaces. Taken together, the findings highpoint the potential of the designed scaffold as a multifunctional platform for bone tissue regeneration.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"339 ","pages":"Article 129126"},"PeriodicalIF":4.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145134174","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":"Blend compatibilizers for alkyne-containing hydrogen “getters” in crosslinked siloxanes","authors":"Rose McDonough ,&nbsp;Samantha Talley ,&nbsp;Bethany Wilburn ,&nbsp;Timothy E. Long","doi":"10.1016/j.polymer.2025.129130","DOIUrl":"10.1016/j.polymer.2025.129130","url":null,"abstract":"<div><div>Low molar mass multi-alkynes, commonly called hydrogen getters, continue to receive attention due to their ability to irreversibly sequester hydrogen gas in sensitive environments such as ultra-high vacuum and electronics. 1,4-bis(phenylethynyl)benzene (DEB) bisalkyne offers suitable reactivity as an evaporable getter due to efficient stoichiometric hydrogen uptake. However, as expected, poor dispersibility in polymer matrices and crystallization upon hydrogenation restrict DEB to powdered form factors. Compatibilizers will promote a more homogeneous dispersion throughout non-polar polymeric networks. Thus, this research employs styrenic graft copolymers to effectively disperse DEB. Free radical copolymerization of styrene with a poly(dimethyl siloxane) macromonomer (PDMS-MM) of varying molecular weights (1k and 5k) afforded effective graft copolymer compatibilizers. Furthermore, facile hydrosilylation of styrene with a hydride-terminated PDMS-MM provided an alternative phenethyl-PDMS MM 1k low molar mass compatibilizer that also effectively promoted DEB dispersion. Both high molecular weight styrenic graft copolymers and low molecular weight siloxane compatibilizers were suitable to disperse alkyne-containing hydrogen scavengers in siloxane networks.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"339 ","pages":"Article 129130"},"PeriodicalIF":4.5,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145127928","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":"Dynamics of hydrogen-rich species in light-cured dental materials","authors":"Maksym Golub ,&nbsp;Jörg Pieper ,&nbsp;Mark T.F. Telling ,&nbsp;Tilo Seydel ,&nbsp;Bernhard Frick ,&nbsp;Ana R. Benetti ,&nbsp;Heloisa N. Bordallo","doi":"10.1016/j.polymer.2025.129134","DOIUrl":"10.1016/j.polymer.2025.129134","url":null,"abstract":"<div><div>Dental resin composites consist mainly of (di)methacrylate resins and an inorganic filler, and their polymerization reaction is initiated by light activation. Over the years, the physical properties of these light-curing materials have improved, and currently, the polymerization kinetics are well established. However, the influence of hydrogen bond formation and the restriction of molecular mobility during polymer network development is not fully elucidated. Here, we were able to explore the dynamics of hydrogen-rich species in a light-cured model unfilled resin and in a resin-modified polyalkenoate cement by means of a unique combination of light-activation and quasielastic neutron spectroscopy, which was used for modelling of the elastic incoherent structure factor (EISF). This experimental study not only confirms a substantial reduction in the nanoscale mobility of the monomers under light activation but also describes changes to the materials’ local structure. In brief, data from both light-cured samples (resin and cement) are described in terms of lone isotropic rotations, indicating that on a time average, the molecules have no preferred orientation. However, before light activation, more complex dynamical descriptions, including conformational jumps, were required to explain the nanoscale mobility of the unpolymerized materials. Clearly, the obtained emerging details on the evolution of the nanostructure in light-cured dental materials open possibilities for further advanced research in the field.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"339 ","pages":"Article 129134"},"PeriodicalIF":4.5,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145127906","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":"Isotactic copolymerization of but-1-ene with polar vinyl monomers: the effect of ω-alken-1-ol comonomer content on phase behavior, melt rheology, mechanical and adhesive properties of functionalized poly(but-1-ene)s","authors":"Guzelia I. Sadrtdinova ,&nbsp;Alexey A. Vinogradov ,&nbsp;Ilya E. Nifant'ev ,&nbsp;Alexander A. Vinogradov ,&nbsp;Pavel D. Komarov ,&nbsp;Svetlana O. Ilyina ,&nbsp;Valeriya I. Ovchinnikova ,&nbsp;Natalia B. Ivchenko ,&nbsp;Sergey O. Ilyin ,&nbsp;Pavel V. Ivchenko","doi":"10.1016/j.polymer.2025.129133","DOIUrl":"10.1016/j.polymer.2025.129133","url":null,"abstract":"<div><div>Isotactic copolymerization of but-1-ene with bio-based undec-10-en-1-ol (<strong>M1</strong>), dec-9-en-1-ol (<strong>M2</strong>) and their silyl esters (<strong>M3</strong>–<strong>M5</strong>), catalyzed by C₁-symmetric <em>ansa</em>-heterocene [Me₂Si(η⁵-2,4,7-trimethelinden-1-yl)(η⁵-2,5-dimethyl-7<em>H</em>-cyclopenta[1,2-<em>b</em>:4,3-<em>b</em>']dithiophen-7-yl)]ZrCl₂ (<strong>Zr1</strong>), activated by ⁱBu₃Al and MMAO-12, was explored for the first time. At [Al_MMAO]/[<strong>Zr1</strong>] = 40 and [Monomer]/[<strong>Zr1</strong>] = 5,000, ⁱBu₂Al-protected ω-alken-1-ols have demonstrated highest activities and up to 16.7 mol% degrees of the comonomer incorporation with a formation of (co)polymers with moderate stereoregularity (for isotactic poly(but-1-ene) iPB <em>T</em>_m = 93.3 °C). At [Al_MMAO]/[<strong>Zr1</strong>] = 400 and [Monomer]/[<strong>Zr1</strong>] = 100,000, iPB with <em>T</em>_m = 102.9 °C was formed; the presence of ⁱBu₂Al-protected undec-10-en-1-ol (<strong>M1-Al</strong>) led to substantial increase of the <em>M</em>_n of (co)polymers from 229 kDa (iPB) to 1193 kDa (copolymer containing 3.6 mol% of <strong>M1</strong>). XRD and DSC studies of the (co)polymers revealed a positive impact of the low comonomer content on the rate of Form II to Form I transition in iPB. Copolymers containing 0.3–0.6 mol% of OH groups showed improved melt rheology and mechanical properties, while the copolymer with 2.0 mol% <strong>M1</strong> content turned out to be a hot-melt adhesive for steel with one and a half times higher bonding strength than commercial poly(ethylene-<em>co</em>-vinyl acetate).</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"339 ","pages":"Article 129133"},"PeriodicalIF":4.5,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145116339","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":"Orientation dependent of stretching-induced cavitation behavior of Poly(vinylidene fluoride-co-hexafluoropropylene)","authors":"Zhenxian Chen ,&nbsp;Yingying Wang ,&nbsp;Hang Guo ,&nbsp;Bijin Xiong","doi":"10.1016/j.polymer.2025.129135","DOIUrl":"10.1016/j.polymer.2025.129135","url":null,"abstract":"<div><div>This study elucidates the orientation-dependent cavitation dynamics in poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) through in situ X-ray scattering analysis of cast films featuring controlled lamellar architectures. By engineering two distinct lamellar orientations—normals parallel versus perpendicular to the tensile axis—we demonstrate that cavitation initiates exclusively when lamellae are orthogonally aligned to the stretching direction. The critical onset strain for cavitation exhibits annealing-temperature sensitivity, decreasing systematically from 8.60 % to 6.60 % with increasing annealing temperature. X-ray scattering evidence reveals a sequential structural evolution: lamellar fragmentation precedes cavity nucleation, followed by dimensional progression from nanoscale voids to micrometer-scale defects. Positron annihilation lifetime spectroscopy indicates that amorphous free volume coalescence during lamellar disruption further facilitates cavity expansion within the amorphous phase. Our findings establish that lamellar fracturing dominates in highly oriented PVDF-HFP systems, providing new insights for designing mechanically robust porous polymer architectures.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"339 ","pages":"Article 129135"},"PeriodicalIF":4.5,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145127927","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":"One-pot synthesis of alternating poly(ester amide)s via water-regulated esterification and amidation sequence","authors":"Tao Liu ,&nbsp;Fangfang Niu ,&nbsp;Kan Cheng ,&nbsp;Simeng Gao ,&nbsp;Yumin Xia ,&nbsp;Xueli Wang ,&nbsp;Jianyong Yu ,&nbsp;Shuohan Huang ,&nbsp;Yong He","doi":"10.1016/j.polymer.2025.129129","DOIUrl":"10.1016/j.polymer.2025.129129","url":null,"abstract":"<div><div>The synthesis of high-value alternating poly(ester amide)s (PEAs) has traditionally relied on controlled sequential esterifica-tion and amidation reactions. However, the lack of an efficient, straightforward production method has hindered their large-scale manufacture. Here, we demonstrate a one-pot synthesis approach that employs water as an esterification inhibitor to regulate the sequential amidation and esterification of α, ω-amino alcohol and adipic acid. Structural characterization of the amidation intermediates, along with the corresponding PEAs, confirmed the reaction followed the intended pathway. The corresponding equilibrium models were founded based on coexisting systems of hydroxyl, amino, and carboxyl groups, which validated the effectiveness of the method and established its broader applicability. By adjusting α, ω-amino alcohol species, a series of alternating poly(ester amide)s with elevated <em>T</em>_<em>m</em> (92–120 °C) and biodegradable properties were synthesized in a one-pot process. In light of the economic and efficient characteristics of water-regulated sequential condensation, this method shows significant industrial potential for synthesizing high-value biodegradable PEAs with ordered structures.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"339 ","pages":"Article 129129"},"PeriodicalIF":4.5,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145127929","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":"Emerging nanomaterials for conductive electroactive and stretchable hydrogels in biomedical microdevices","authors":"Nuradwa Afrina Adnan ,&nbsp;Nurfarhanim Abu Bakar ,&nbsp;N. Idayu Zahid ,&nbsp;Nurdiana Nordin","doi":"10.1016/j.polymer.2025.129132","DOIUrl":"10.1016/j.polymer.2025.129132","url":null,"abstract":"<div><div>The integration of nanomaterials into hydrogels has significantly advanced the development of highly conductive, electroactive, and stretchable materials suitable for biomedical microdevices. These hydrogels utilize the distinctive electrical, mechanical, and biocompatible qualities of nanomaterials to develop flexible interfaces that support dynamic biological interactions. This review outlines the fundamental properties of these hydrogels, recent advances in fabrication techniques, which also include monitoring and characterization, and emphasizes the importance of nanomaterials in adjusting their elasticity and reactivity. Additionally, special attention was given to their application in biomedical microdevices, such as bioelectronic interfaces and microelectromechanical systems (BioMEMS). The discussion also addresses current challenges related to material performance, interface stability, and long-term biocompatibility, as well as innovative strategies to overcome these issues. Emerging trends towards multifunctional, autonomous, and intelligent biomedical devices are examined. These developments position electroactive, stretchable hydrogels as vital components for next-generation biomedical microtechnologies.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"339 ","pages":"Article 129132"},"PeriodicalIF":4.5,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145116286","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}