Macromolecules最新文献

{"title":"Linking the Chiral Expression of Conjugated Polymers to Their Aggregation Type","authors":"Annelien van Oosten, Karen Aerts, Yovan de Coene, Thierry Verbiest, Guy Koeckelberghs","doi":"10.1021/acs.macromol.4c02444","DOIUrl":"https://doi.org/10.1021/acs.macromol.4c02444","url":null,"abstract":"Due to their strong absorption of visible light, chirality in chiral conjugated polymers (CPs) is typically expressed by electronic circular dichroism (ECD). Unfortunately, while many chiral CPs give rise to strong ECD upon stacking, predicting and reproducing the resulting behavior has proven to be extremely difficult. Here we show that the ECD of CPs is correlated to the known types I and II aggregation. It is demonstrated that type I aggregation results in an ECD signal with an additional monosignal Cotton effect, therefore yielding an asymmetrical spectrum. In contrast, in type II aggregation, the resulting ECD signal is symmetrical. This is determined for a model chiral CP, poly(3-(3,7-(<i>S</i>)-dimethyloctyl)thiophene) in two ways. Additionally, the actual process of both aggregation types is monitored by a combination of linear and nonlinear optical techniques. Finally, the molecular structure of various CPs is correlated to the aggregation type, providing a general relationship between the molecular structure of CPs and their ECD.","PeriodicalId":51,"journal":{"name":"Macromolecules","volume":"20 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advancing Non-isocyanate Polyurethane Foams: exo-Vinylene Cyclic Carbonate–Amine Chemistry Enabling Room-Temperature Reactivity and Fast Self-Blowing","authors":"Maksim Makarov, Maxime Bourguignon, Bruno Grignard, Christophe Detrembleur","doi":"10.1021/acs.macromol.4c02894","DOIUrl":"https://doi.org/10.1021/acs.macromol.4c02894","url":null,"abstract":"Though widely used, polyurethane foams raise health concerns stemming from their isocyanate precursors. Nonisocyanate polyurethane foams (NIPUFs), synthesized by aminolysis of 5-membered cyclic carbonates, represent safer and more sustainable alternatives. Despite their potential, achieving efficient self-blowing NIPUFs from room temperature (RT) formulations has proven highly challenging, as previous methods rely on external heat sources, prolonged reaction times, or are based on hybrid formulations involving epoxides. In this study, we demonstrate a new concept that makes rapid the production of full NIPUFs (i.e., with exclusive urethane linkages) from RT solvent-free formulations through the incorporation of exovinylene cyclic carbonate (αCC). This approach incorporated hydroxyoxazolidone groups, i.e., cyclic hydroxyurethanes, as pendant groups of the polyhydroxyurethane backbone. We investigated the reactions occurring in this foaming system and identified optimal foaming formulations to rapidly produce the foams within 1–5 min, with a high gel content. The study explored monomer variations as amine mixtures and different αCCs. Compression tests revealed that the foam’s mechanical properties were easily tuned by adapting the formulation composition, giving access to both flexible and rigid foams with pore sizes in the range of conventional PU foams. Moreover, we highlighted the importance of the hydrophilic nature of NIPUFs on their mechanical properties, with a decrease in the Young’s modulus when exposed to increased humidity contents. While these foams, like many NIPUs, exhibit inherent hydrophilicity, this limitation may be addressed through additives or future formulation optimization. Our new concept paves the way for the rapid preparation of the next generation of full isocyanate-free polyurethane foams with modular properties.","PeriodicalId":51,"journal":{"name":"Macromolecules","volume":"16 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advancing Non-isocyanate Polyurethane Foams: exo-Vinylene Cyclic Carbonate–Amine Chemistry Enabling Room-Temperature Reactivity and Fast Self-Blowing","authors":"Maksim Makarov,&nbsp;Maxime Bourguignon,&nbsp;Bruno Grignard* and Christophe Detrembleur*,&nbsp;","doi":"10.1021/acs.macromol.4c0289410.1021/acs.macromol.4c02894","DOIUrl":"https://doi.org/10.1021/acs.macromol.4c02894https://doi.org/10.1021/acs.macromol.4c02894","url":null,"abstract":"<p >Though widely used, polyurethane foams raise health concerns stemming from their isocyanate precursors. Nonisocyanate polyurethane foams (NIPUFs), synthesized by aminolysis of 5-membered cyclic carbonates, represent safer and more sustainable alternatives. Despite their potential, achieving efficient self-blowing NIPUFs from room temperature (RT) formulations has proven highly challenging, as previous methods rely on external heat sources, prolonged reaction times, or are based on hybrid formulations involving epoxides. In this study, we demonstrate a new concept that makes rapid the production of full NIPUFs (i.e., with exclusive urethane linkages) from RT solvent-free formulations through the incorporation of exovinylene cyclic carbonate (αCC). This approach incorporated hydroxyoxazolidone groups, i.e., cyclic hydroxyurethanes, as pendant groups of the polyhydroxyurethane backbone. We investigated the reactions occurring in this foaming system and identified optimal foaming formulations to rapidly produce the foams within 1–5 min, with a high gel content. The study explored monomer variations as amine mixtures and different αCCs. Compression tests revealed that the foam’s mechanical properties were easily tuned by adapting the formulation composition, giving access to both flexible and rigid foams with pore sizes in the range of conventional PU foams. Moreover, we highlighted the importance of the hydrophilic nature of NIPUFs on their mechanical properties, with a decrease in the Young’s modulus when exposed to increased humidity contents. While these foams, like many NIPUs, exhibit inherent hydrophilicity, this limitation may be addressed through additives or future formulation optimization. Our new concept paves the way for the rapid preparation of the next generation of full isocyanate-free polyurethane foams with modular properties.</p>","PeriodicalId":51,"journal":{"name":"Macromolecules","volume":"58 3","pages":"1673–1685 1673–1685"},"PeriodicalIF":5.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143375928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"How Do Solvent–Polymer–Surface Interactions Affect the Physisorption of Polymer Chains during Flow-Induced Translocation through Inorganic Oxide Nanochannels?","authors":"Yiren Wang,&nbsp;Jianing Zhou,&nbsp;Haorong Huang,&nbsp;Tao Zheng and Lianwei Li*,&nbsp;","doi":"10.1021/acs.macromol.4c0172310.1021/acs.macromol.4c01723","DOIUrl":"https://doi.org/10.1021/acs.macromol.4c01723https://doi.org/10.1021/acs.macromol.4c01723","url":null,"abstract":"<p >This work aims to explore how polymer–surface–solvent ternary interactions play a synergistical role in affecting the physisorption of PBA_N [poly(benzyl acrylate)] chains inside 20 and 100 nm Whatman anodic aluminum oxide nanochannels in flow field by considering the Flory interaction parameter (χ_F), adsorption parameter (χ_S), solution concentration (<i>C</i>), and degree of polymerization (<i>N</i>). By using a homemade triple-pump system for in situ monitoring the transmembrane pressure during the solvent switching process, we have found: (1) a combination of χ_F and χ_S significantly impacts the adsorption and reversibility of PBA_N chains in toluene, ethyl acetate, and tetrahydrofuran, and an extremely slow kinetics process is revealed in dimethylformamide; (2) the adsorption kinetic curves for different PBA_N chain lengths are all nicely described by the dual exponential fitting including the fast and slow modes, which can be attributed to the fast approaching of whole chain and the slow reorganization of local conformation, respectively, and the conformational reorganization is found to be the most significant in dimethylformamide; (3) a universal two-regime scaling dependence <i>A</i>_occupy<i>/A</i>_total ∼ <i>N</i>^γ is observed between the cross-sectional coverage factor (<i>A</i>_occupy<i>/A</i>_total) and <i>N</i>, with γ ∼ 0.50 in the weak confinement regime when <i>A</i>_occupy<i>/A</i>_total &lt; 0.30 and γ ∼ 1.5 in the strong confinement when <i>A</i>_occupy<i>/A</i>_total &gt; 0.30, independent of pore size, chain length, and solvent type, indicating the dominant effect of the crowding effect when <i>A</i>_occupy<i>/A</i>_total &gt; 0.30; (4) the adsorption reversibility and desorption efficiency are found to increase with the solvent quality and polarity in 20 and 100 nm systems during the solvent switching process, which provides a method for the regulation of adsorption thickness; (5) an extremely weak dependence of <i>A</i>_occupy<i>/A</i>_total ∼ <i>C</i> is observed, which is consistent with Silberberg’s prediction. Our present result provides useful guidance for understanding and comparing the behavior of chain adsorption in the nonidealized and idealized membrane system.</p>","PeriodicalId":51,"journal":{"name":"Macromolecules","volume":"58 3","pages":"1435–1450 1435–1450"},"PeriodicalIF":5.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143376044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"How Do Solvent–Polymer–Surface Interactions Affect the Physisorption of Polymer Chains during Flow-Induced Translocation through Inorganic Oxide Nanochannels?","authors":"Yiren Wang, Jianing Zhou, Haorong Huang, Tao Zheng, Lianwei Li","doi":"10.1021/acs.macromol.4c01723","DOIUrl":"https://doi.org/10.1021/acs.macromol.4c01723","url":null,"abstract":"This work aims to explore how polymer–surface–solvent ternary interactions play a synergistical role in affecting the physisorption of PBA_N [poly(benzyl acrylate)] chains inside 20 and 100 nm Whatman anodic aluminum oxide nanochannels in flow field by considering the Flory interaction parameter (χ_F), adsorption parameter (χ_S), solution concentration (<i>C</i>), and degree of polymerization (<i>N</i>). By using a homemade triple-pump system for in situ monitoring the transmembrane pressure during the solvent switching process, we have found: (1) a combination of χ_F and χ_S significantly impacts the adsorption and reversibility of PBA_N chains in toluene, ethyl acetate, and tetrahydrofuran, and an extremely slow kinetics process is revealed in dimethylformamide; (2) the adsorption kinetic curves for different PBA_N chain lengths are all nicely described by the dual exponential fitting including the fast and slow modes, which can be attributed to the fast approaching of whole chain and the slow reorganization of local conformation, respectively, and the conformational reorganization is found to be the most significant in dimethylformamide; (3) a universal two-regime scaling dependence <i>A</i>_occupy<i>/A</i>_total ∼ <i>N</i>^γ is observed between the cross-sectional coverage factor (<i>A</i>_occupy<i>/A</i>_total) and <i>N</i>, with γ ∼ 0.50 in the weak confinement regime when <i>A</i>_occupy<i>/A</i>_total &lt; 0.30 and γ ∼ 1.5 in the strong confinement when <i>A</i>_occupy<i>/A</i>_total &gt; 0.30, independent of pore size, chain length, and solvent type, indicating the dominant effect of the crowding effect when <i>A</i>_occupy<i>/A</i>_total &gt; 0.30; (4) the adsorption reversibility and desorption efficiency are found to increase with the solvent quality and polarity in 20 and 100 nm systems during the solvent switching process, which provides a method for the regulation of adsorption thickness; (5) an extremely weak dependence of <i>A</i>_occupy<i>/A</i>_total ∼ <i>C</i> is observed, which is consistent with Silberberg’s prediction. Our present result provides useful guidance for understanding and comparing the behavior of chain adsorption in the nonidealized and idealized membrane system.","PeriodicalId":51,"journal":{"name":"Macromolecules","volume":"15 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase Transitions of Poly(vinylidene Fluoride) under Coupled Electric-Strain Field","authors":"Tianshu Liu, Junxian Liu, Yihan Nie, Haifei Zhan, Liangzhi Kou, Yuantong Gu","doi":"10.1021/acs.macromol.4c02036","DOIUrl":"https://doi.org/10.1021/acs.macromol.4c02036","url":null,"abstract":"Poly(vinylidene fluoride) (PVDF) is a pivotal piezoelectric polymeric building block for advanced electronics, whose piezoelectric property is determined by the proportion of the polar β phase. Based on molecular dynamics simulations, this work assessed the phase transition behaviors of PVDF from the α phase to the β phase under a coupled electric-strain field. It is found that the presence of strain can significantly reduce the threshold strength of the electric field, which triggers robust and stable phase transitions. Similarly, the presence of an electric field will reduce the required stress or strain that initiates phase transitions. The findings obtained in this work could provide useful guidelines for manipulating PVDF with the required piezoelectric properties.","PeriodicalId":51,"journal":{"name":"Macromolecules","volume":"84 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pearl-Necklace to Unimolecular Micelle Formation by Heterograft Bottlebrush Polymers in Solution","authors":"Yiyan Kuang,&nbsp; and ,&nbsp;Elena E. Dormidontova*,&nbsp;","doi":"10.1021/acs.macromol.4c0245110.1021/acs.macromol.4c02451","DOIUrl":"https://doi.org/10.1021/acs.macromol.4c02451https://doi.org/10.1021/acs.macromol.4c02451","url":null,"abstract":"<p >Bottlebrush polymers (BBPs) have attracted considerable attention due to their unique properties and a variety of applications. Using coarse-grained molecular dynamics simulations, we investigate and compare the structural properties of cyclic and linear poly(vinyl alcohol)-<i>graft</i>-poly(ethylene oxide)/poly(ethylene) (PVA-<i>g</i>-PEO/PE) in aqueous solution as a function of hydrophobic side-chain fraction. The side chains of different chemical nature allow the bottlebrush polymer to self-organize into different unimolecular structures. We found that with an increasing polyethylene fraction or PE side-chain length, an amphiphilic BBP self-organizes first into a pearl-necklace structure, which contains several hydrophobic aggregates engulfed and separated by hydrophilic side chains followed by a dumbbell-like structure. When the separation between two neighboring PE side chains becomes less than half of a PE side-chain length (<i>d</i>_sep &lt; <i>l</i>_PE/2), a spherical unimolecular micelle with a single hydrophobic core surrounded by hydrophilic corona forms. Linear heterograft BBPs exhibit a higher propensity for the pearl-necklace regime at lower PE fractions, while for the cyclic heterograft BBPs, the backbone curvature enhances formation of dumbbell-like structures and facilitates packing into a more compact core of unimolecular micelles at higher PE content. The shape anisotropy of linear heterograft BBPs systematically decreases with an increase of PE fraction as the shape changes from 1D worm-like to a 3D spherically symmetric unimolecular micelle, while for cyclic heterograft BBPs, the shape anisotropy increases, reaches a maximum, and decreases reflecting conformational changes from a planar 2D structure to 1D dumbbell to 3D spherical conformations, accordingly. Among the different conformations of heterograft BBPs in solution, a spherical unimolecular micelle with the smallest hydrophobic core exhibits minimal contacts with water and maximum protection by the hydrophilic corona. These results demonstrate that heterograft BBPs offer a variety of conformations controlled by the side-chain length and composition that can be exploited in different applications including encapsulation of hydrophobic moieties for therapeutic or imaging applications.</p>","PeriodicalId":51,"journal":{"name":"Macromolecules","volume":"58 3","pages":"1470–1480 1470–1480"},"PeriodicalIF":5.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143375927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase Transitions of Poly(vinylidene Fluoride) under Coupled Electric-Strain Field","authors":"Tianshu Liu,&nbsp;Junxian Liu,&nbsp;Yihan Nie,&nbsp;Haifei Zhan*,&nbsp;Liangzhi Kou and Yuantong Gu*,&nbsp;","doi":"10.1021/acs.macromol.4c0203610.1021/acs.macromol.4c02036","DOIUrl":"https://doi.org/10.1021/acs.macromol.4c02036https://doi.org/10.1021/acs.macromol.4c02036","url":null,"abstract":"<p >Poly(vinylidene fluoride) (PVDF) is a pivotal piezoelectric polymeric building block for advanced electronics, whose piezoelectric property is determined by the proportion of the polar β phase. Based on molecular dynamics simulations, this work assessed the phase transition behaviors of PVDF from the α phase to the β phase under a coupled electric-strain field. It is found that the presence of strain can significantly reduce the threshold strength of the electric field, which triggers robust and stable phase transitions. Similarly, the presence of an electric field will reduce the required stress or strain that initiates phase transitions. The findings obtained in this work could provide useful guidelines for manipulating PVDF with the required piezoelectric properties.</p>","PeriodicalId":51,"journal":{"name":"Macromolecules","volume":"58 3","pages":"1537–1546 1537–1546"},"PeriodicalIF":5.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143376218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Linking the Chiral Expression of Conjugated Polymers to Their Aggregation Type","authors":"Annelien van Oosten,&nbsp;Karen Aerts,&nbsp;Yovan de Coene,&nbsp;Thierry Verbiest and Guy Koeckelberghs*,&nbsp;","doi":"10.1021/acs.macromol.4c0244410.1021/acs.macromol.4c02444","DOIUrl":"https://doi.org/10.1021/acs.macromol.4c02444https://doi.org/10.1021/acs.macromol.4c02444","url":null,"abstract":"<p >Due to their strong absorption of visible light, chirality in chiral conjugated polymers (CPs) is typically expressed by electronic circular dichroism (ECD). Unfortunately, while many chiral CPs give rise to strong ECD upon stacking, predicting and reproducing the resulting behavior has proven to be extremely difficult. Here we show that the ECD of CPs is correlated to the known types I and II aggregation. It is demonstrated that type I aggregation results in an ECD signal with an additional monosignal Cotton effect, therefore yielding an asymmetrical spectrum. In contrast, in type II aggregation, the resulting ECD signal is symmetrical. This is determined for a model chiral CP, poly(3-(3,7-(<i>S</i>)-dimethyloctyl)thiophene) in two ways. Additionally, the actual process of both aggregation types is monitored by a combination of linear and nonlinear optical techniques. Finally, the molecular structure of various CPs is correlated to the aggregation type, providing a general relationship between the molecular structure of CPs and their ECD.</p>","PeriodicalId":51,"journal":{"name":"Macromolecules","volume":"58 3","pages":"1390–1400 1390–1400"},"PeriodicalIF":5.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143376391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultra-Strong, Humidity-Tolerant Thermoset Based on Dynamic Covalent Bond Integration Strategy via Boron−Nitrogen Bidentate Coordination","authors":"Wuzhuang Wei, Xiaoting Zhang, Chenyue Liang, Yu Li, Shujuan Wang, Tao Hong, Xinli Jing","doi":"10.1021/acs.macromol.4c02613","DOIUrl":"https://doi.org/10.1021/acs.macromol.4c02613","url":null,"abstract":"Dynamic covalent polymers, especially those containing boronic ester bonds, face an inherent contradiction between reversibility and robustness, as water poses a severe threat to their mechanical properties. Herein, we propose a scalable dynamic covalent chemistry, namely, interlocking imine bonds of the bis-Schiff base (Salen) and aryl boronic ester bonds to form sNCB linkages. Benefiting from the internal boron−nitrogen bidentate coordination, the sNCB linkage overcomes the inherent defect of boronic ester bonds, exhibiting strong hydrolysis/thermal stability. When we design the cross-linked network to contain merely 8 wt % of sNCB linkages, the mechanical robustness of the original polymer can be significantly enhanced, producing an ultrastrong and moisture-resistant material (PETX) with ∼102 MPa tensile strength. Moreover, PETX can still undergo multiple reprocessing and even achieve self-healing. The sNCB linkages also provide PETX with a range of structural health monitoring functions. Our work presents a promising strategy for producing high-strength, stable, and sustainable materials.","PeriodicalId":51,"journal":{"name":"Macromolecules","volume":"12 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}