Macromolecular Chemistry and Physics最新文献

筛选
英文 中文
In Situ Photochemical Synthesis of Environmentally Friendly Conductive Nano-Ink
IF 2.5 4区 化学
Macromolecular Chemistry and Physics Pub Date : 2024-12-27 DOI: 10.1002/macp.202400367
Melisa Konar, Ebru Turgut Him, Nergis Guler, Ezgi Nur Balci, Nergis Arsu
{"title":"In Situ Photochemical Synthesis of Environmentally Friendly Conductive Nano-Ink","authors":"Melisa Konar,&nbsp;Ebru Turgut Him,&nbsp;Nergis Guler,&nbsp;Ezgi Nur Balci,&nbsp;Nergis Arsu","doi":"10.1002/macp.202400367","DOIUrl":"https://doi.org/10.1002/macp.202400367","url":null,"abstract":"<p>Advancements in nanotechnology allow for the development of in situ or ex situ prepared nanocoatings and nanoparticles which are valuable in the electronics industry due to their intrinsic physical and chemical properties. Printed electronics, intended for applications such as flexible displays and smart labels, offer a distinct advantage over conventional products. The primary components used in printed electronics are the nano-ink containing polymer matrix and the substrate for printing. Gold, silver, and copper are commonly chosen for these processes because of their excellent electrical conductivity. In the electronics industry, it is well-known that producing conductive ink typically requires high temperatures and extended processing times, as is the case with conventional methods. In this study, in situ prepared silver nanoparticles (AgNPs) in a crosslinked polymeric matrix are achieved simultaneously using environmentally friendly polyvinyl alcohol (PVA) and acrylamide via photopolymerization. The generated radicals facilitated the formation of silver nano particles while simultaneously forming a cross-linked network that underwent further processing to transform into ink. The obtained polymer ink formulation is suitable for use with a refillable pen, and it is determined that it dries shortly after writing on surfaces such as paper and glass and exhibits high durability under room conditions.</p>","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 7","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143770613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
“Grafting to” Rubber Composite for Elastic Dielectric Material
IF 2.5 4区 化学
Macromolecular Chemistry and Physics Pub Date : 2024-12-27 DOI: 10.1002/macp.202400364
Dinda Bazliah, Qi-An Hong, Livy Laysandra, Yu-Cheng Chiu
{"title":"“Grafting to” Rubber Composite for Elastic Dielectric Material","authors":"Dinda Bazliah,&nbsp;Qi-An Hong,&nbsp;Livy Laysandra,&nbsp;Yu-Cheng Chiu","doi":"10.1002/macp.202400364","DOIUrl":"https://doi.org/10.1002/macp.202400364","url":null,"abstract":"<p>In addition to traditional rubber applications, 1,4-cis-polyisoprene (<i>cis</i>-PI) has been utilized in wearable electronics. While synthetic PI typically exhibits lower durability compared to natural rubber (NR), high-molecular-weight <i>cis</i>-PI compensates by offering improved mechanical properties and chemical resistance. The group proposes using a commercial <i>cis-</i>PI with high molecular weight of 250 000 g mol<sup>−1</sup> (PI<sub>250K-C</sub>) grafted onto modified nanoparticle structures including silicon dioxide (<i>m</i>SiO<sub>2</sub>), rutile titanium dioxide (<i>m</i>RTiO<sub>2</sub>), and anatase titanium dioxide (<i>m</i>ATiO<sub>2</sub>) as an insulator in organic field effect transistors (OFETs) due to its naturally low dielectric constant. The nanoparticles are pretreated with a coupling agent to improve adhesion and prevent aggregation. Rubber composite films, designated X%-<i>m</i>Y-PI<sub>250K-C</sub> (where X = 10, 20, 30% and Y = <i>m</i>SiO<sub>2</sub>, <i>m</i>RTiO<sub>2</sub>, <i>m</i>ATiO<sub>2</sub>), are fabricated using sulfur vulcanization. The modified films demonstrate excellent mechanical stress (1.15 ± 0.1 MPa) and elasticity, enduring 50 loading–unloading cycles without residual strain. In contrast, rubber composites produced from simple blending show half the mechanical stress at 0.7 ± 0.3 MPa, which is attributed to nanoparticle agglomeration observed in SEM and EDX results. Additionally, <i>m</i>RTiO<sub>2</sub> nanoparticles significantly increase the dielectric constant of PI<sub>250K-C</sub> from 2.12 to 12.93, enhancing electrical performance for TFT applications. This study underscores the effectiveness of the “grafting to” approach for producing robust rubber composites, highlighting the importance of nanoparticle selection and fabrication precision for stretchable organic electronics.</p>","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 3","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143253558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of Chain Dispersity on the Stability of Frank–Kasper Phases Self-Assembled from Diblock Copolymers
IF 2.5 4区 化学
Macromolecular Chemistry and Physics Pub Date : 2024-12-23 DOI: 10.1002/macp.202400393
Chi To Lai, An-Chang Shi
{"title":"Effects of Chain Dispersity on the Stability of Frank–Kasper Phases Self-Assembled from Diblock Copolymers","authors":"Chi To Lai,&nbsp;An-Chang Shi","doi":"10.1002/macp.202400393","DOIUrl":"https://doi.org/10.1002/macp.202400393","url":null,"abstract":"<p>The effect of chain dispersity on the relative stability of Frank–Kasper (FK) phases self-assembled from diblock copolymers (DBCPs) is studied using self-consistent field theory applied to DBCPs with one disperse block obeying the Poisson or Schulz–Zimm distributions. The results demonstrate that the chain dispersity enhances the relative stability of the FK phases. For DBCPs with small conformational asymmetry, the FK <span></span><math>\u0000 <semantics>\u0000 <mi>σ</mi>\u0000 <annotation>$sigma$</annotation>\u0000 </semantics></math> phase can be stabilized by dispersity and the stability window of the FK phases widens with the increase of dispersity. For DBCPs with large conformational asymmetry, the Laves C14 and C15 phases, which are metastable in monodisperse DBCPs, can be stabilized by dispersity. An analysis of the spatial organization of polymers reveals that the enhanced stability of the FK phases originated from intra- and inter-domain segregation of chains with different lengths.</p>","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 3","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/macp.202400393","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143253073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Glycosylated Polymers Toward Stable Protein-Based Lighting
IF 2.5 4区 化学
Macromolecular Chemistry and Physics Pub Date : 2024-12-23 DOI: 10.1002/macp.202400429
David Gutierrez-Armayor, Alicia Asin, Marta Patrian, Mattia Nieddu, Rubén D. Costa
{"title":"Glycosylated Polymers Toward Stable Protein-Based Lighting","authors":"David Gutierrez-Armayor,&nbsp;Alicia Asin,&nbsp;Marta Patrian,&nbsp;Mattia Nieddu,&nbsp;Rubén D. Costa","doi":"10.1002/macp.202400429","DOIUrl":"https://doi.org/10.1002/macp.202400429","url":null,"abstract":"<p>Protein-based optoelectronics faces two challenges to keep the performance of conventional technologies: stabilizing proteins through water-free fabrication methods and developing bio-friendly interfaces. In this context, bio-hybrid lighting, which integrates fluorescent protein (FP) based photon down-converting filters, represents an emerging concept toward ensuring a sustainable lighting sector. They promise to replace rare earth and/or toxic emitters applied for photon down-conversion in white commercial LEDs with FP-polymer color filters. A key component is a branched polyethylene oxide that stabilizes FPs in a water-less environment upon film forming. Recently sugar additives are successfully used as natural desiccation protectants against osmotic dehydration stress to further enhance FP stability by reinforcing intra-protein H-bonding. Herein, the glycosylation of the branched polymer is disclosed to stabilize FPs in coatings that resulted in 300-fold enhanced device stability due to a significant reduction of the heat generation and slow-down of the H-transfer-assisted emission deactivation process compared to reference polymer coatings. Thermal and spectroscopic techniques suggest that this finding is related to the higher crystallinity of the coatings and rigid environment provided by the glycosylated polymers. Overall, this work reinforces the use of sugars (additives or glycosylated polymers) to preserve the emission/thermal properties of FPs in water-less environments for optoelectronics.</p>","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/macp.202400429","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermal Conductivity Hydroxylated Boron Nitride/Polyurethane/Polyvinyl Alcohol Composite Nanofiber Film Prepared by Electrospinning
IF 2.5 4区 化学
Macromolecular Chemistry and Physics Pub Date : 2024-12-23 DOI: 10.1002/macp.202400365
Guan zhi Zhao, Ruijie Ma, Yunjie Yin
{"title":"Thermal Conductivity Hydroxylated Boron Nitride/Polyurethane/Polyvinyl Alcohol Composite Nanofiber Film Prepared by Electrospinning","authors":"Guan zhi Zhao,&nbsp;Ruijie Ma,&nbsp;Yunjie Yin","doi":"10.1002/macp.202400365","DOIUrl":"https://doi.org/10.1002/macp.202400365","url":null,"abstract":"<p>As functional composite materials rapidly develop, the insufficient thermal conductivity of polymer materials to meet application requirements is becoming increasingly apparent. In this work, electrospinning is employed to prepare hydroxylated boron nitride nanosheet (OH-BNNSs)/water-based polyurethane (WPU)/polyvinyl alcohol (PVA) composite nanofiber membranes with good thermal conductivity. When the content of OH-BNNSs is 10 wt.%, the thermal conductivity of the OH-BNNS/PVA/WPU composite nanofiber membrane can reach 0.629 W (mK)<sup>−1</sup>, with yield strength, ultimate tensile strength, and elastic modulus of ≈3.85, ≈5.87, and ≈35.22 MPa, respectively. The results indicate that the OH-BNNS/WPU/PVA composite nanofiber membrane exhibits good thermal conductivity and outstanding hydrophilicity. When the content of OH-BNNSs is appropriate, the composite membrane also demonstrates good mechanical properties, showing significant potential in the field of thermally conductive polymer materials.</p>","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 3","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143253072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Front Cover: Macromol. Chem. Phys. 24/2024 封面:Macromol.Chem.24/2024
IF 2.5 4区 化学
Macromolecular Chemistry and Physics Pub Date : 2024-12-20 DOI: 10.1002/macp.202470048
{"title":"Front Cover: Macromol. Chem. Phys. 24/2024","authors":"","doi":"10.1002/macp.202470048","DOIUrl":"https://doi.org/10.1002/macp.202470048","url":null,"abstract":"<p><b>Front Cover</b>: In article 2400331, Tatsuo Maruyama and co-workers report clickable plastic surfaces with controllable azide surface density by the simple dip-coating method. The surfaces can easily immobilize functional molecules with alkyne groups via strain-promoted azide-alkyne cycloaddition. They succeed in preparing a linear surface gradient of azide group density and also in micropatterning the surfaces by microcontact printing.\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 24","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/macp.202470048","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Masthead: Macromol. Chem. Phys. 24/2024 刊头:Macromol.Chem.24/2024
IF 2.5 4区 化学
Macromolecular Chemistry and Physics Pub Date : 2024-12-20 DOI: 10.1002/macp.202470049
{"title":"Masthead: Macromol. Chem. Phys. 24/2024","authors":"","doi":"10.1002/macp.202470049","DOIUrl":"https://doi.org/10.1002/macp.202470049","url":null,"abstract":"","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 24","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/macp.202470049","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Glass Vials Coated with Polymer-Supported-Catalysts as Reaction Vessels: Stir, Pour, Rinse and Reuse
IF 2.5 4区 化学
Macromolecular Chemistry and Physics Pub Date : 2024-12-18 DOI: 10.1002/macp.202400414
Arun Kumar Gayen, Harshita Sardana, S Ramakrishnan
{"title":"Glass Vials Coated with Polymer-Supported-Catalysts as Reaction Vessels: Stir, Pour, Rinse and Reuse","authors":"Arun Kumar Gayen,&nbsp;Harshita Sardana,&nbsp;S Ramakrishnan","doi":"10.1002/macp.202400414","DOIUrl":"https://doi.org/10.1002/macp.202400414","url":null,"abstract":"<p>Lightly crosslinked polymeric gel-supported catalysts have the potential to retain the recyclability and ease of product isolation of traditional polymer-supported catalysts, while at the same time, they can provide greater homogeneity of catalytic sites and improved reaction rates, especially in the solvent-swollen state. In the present study, a strategy is devised to covalently anchor a film of swellable crosslinked polymer onto a suitably surface-derivatized glass vial, and have utilized this coating to bind to Cu, Pd, and Au catalysts; these coated vials are then utilized for azide-alkyne click, Suzuki coupling and catalytic reduction reactions, respectively. In all cases, simply stirring the reactant mixture in the vial delivers high yields, and the vials can be rinsed and reused several times with little loss of activity. Several control experiments confirm that the catalysis largely occurred within the coated gel film and is not due to leached-out metal in the reaction medium. Importantly, this strategy can be very useful, when adapted for critical labeling reactions of biomolecules, wherein reactions are often carried out on very small scales, and ease of product isolation with zero contamination is critical.</p>","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 5","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143555050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interpenetrating Network Strategy for Highly Effective Toughening of Epoxy Resin Using Cellulose Microgels
IF 2.5 4区 化学
Macromolecular Chemistry and Physics Pub Date : 2024-12-18 DOI: 10.1002/macp.202400402
Bingbing Li, Liqiong Liao, Zhiping Shi, Kai Li, Xiang Li
{"title":"Interpenetrating Network Strategy for Highly Effective Toughening of Epoxy Resin Using Cellulose Microgels","authors":"Bingbing Li,&nbsp;Liqiong Liao,&nbsp;Zhiping Shi,&nbsp;Kai Li,&nbsp;Xiang Li","doi":"10.1002/macp.202400402","DOIUrl":"https://doi.org/10.1002/macp.202400402","url":null,"abstract":"<p>Epoxy resin (EP) is widely used in coatings, adhesives, and molding materials. EP's high crosslinking density provides a strong modulus but also leads to reduced elongation at break and lower toughness. In this study, bacterial cellulose microgel (BC-M) is employed to toughen EP through in situ polymerization, to form an interpenetrating network with EP. Bacterial cellulose nanofibers (BC-CNF) and ethylated bacterial cellulose microgels (EM) are used as controls to highlight the advantages of the 3D network in enhancing polymer toughness. BC-M demonstrates the most effective toughening performance for EP. At a filler content of 0.3 wt.%, BC-M/EP nanocomposites exhibite significant improvements in mechanical properties, including a fracture strength of 107.8 MPa, strain of 3.53%, Young's modulus of 3.09 GPa, and toughness of 1.98 kJ m<sup>−</sup><sup>3</sup>. Compared to EP, these values represent enhancements of 40%, 9.5%, 27.3%, and 58.4%, respectively. Comparisons with BC-CNF/EP and EM/EP nanocomposites clearly demonstrate that BC-M provided superior toughening effects. The exceptional toughening capability of BC-M is attributed to its 3D network structure, which effectively dissipates applied energy, and its strong interfacial interaction with the epoxy matrix through covalent bonding.</p>","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 5","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143555049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Diether-Based Chiral Multilayered 3D Polymers and Oligomers: Unveiling AIE and AIP Phenomena
IF 2.5 4区 化学
Macromolecular Chemistry and Physics Pub Date : 2024-12-14 DOI: 10.1002/macp.202400405
Sai Zhang, Qingzheng Xu, Xiuyuan Qin, Qingkai Yuan, Guigen Li, Yue Zhang
{"title":"Diether-Based Chiral Multilayered 3D Polymers and Oligomers: Unveiling AIE and AIP Phenomena","authors":"Sai Zhang,&nbsp;Qingzheng Xu,&nbsp;Xiuyuan Qin,&nbsp;Qingkai Yuan,&nbsp;Guigen Li,&nbsp;Yue Zhang","doi":"10.1002/macp.202400405","DOIUrl":"https://doi.org/10.1002/macp.202400405","url":null,"abstract":"<p>In this study, the synthesis of a novel chiral multilayer 3D polymer based on a diether structure is reported. This architecture not only imparts chirality but also facilitates the study of aggregation-induced emission (AIE) and aggregation-induced polarization (AIP). Using various polymerization techniques, multilayered chiral structures are constructed that exhibit significant AIE, marked by increased luminescence upon aggregation, and notable AIP behavior, indicating enhanced optical activity. Comprehensive characterization through spectroscopy and microscopy elucidates the mechanisms behind these phenomena. These findings highlight the potential of diether-based chiral multilayer 3D polymers for advanced optoelectronic and sensor applications, paving the way for multifunctional materials.</p>","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 5","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信