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Zhang P, Qin B, Xia J. UV Curable Robust Durable Hydrophobic Coating Based on Epoxy Polyhedral Oligomeric Silsesquioxanes (EP-POSS) and Their Derivatives. ACS OMEGA 2022; 7:17108-17118. [PMID: 35647429 PMCID: PMC9134229 DOI: 10.1021/acsomega.2c00534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Accepted: 04/13/2022] [Indexed: 06/15/2023]
Abstract
Hydrophobic coatings have considerable potential applications in many fields. Ease of operation and high durability are essential for practical use. Fast curing and being solvent-free are a plus, and if they possess certain characteristics (antigraffiti, good adhesion, high hardness, heat resistance, wide range of applicability, etc.) at the same time, it is a dream solution. Herein, a facile one-step approach with the above features was reported for a UV curable robust hydrophobic coating based on Epoxy Polyhedral Oligomeric Silsesquioxanes (EP-POSSs). The structure and surface morphology of these EP-POSSs and their derivatives were systematically studied. Because of the core-in-cage structure which was constructed by repeating units of R-Si(O1/2)3 and the strong covalent bonds of Si-C and Si-O, the coatings displayed high pencil hardness (6-8H), high thermal stability with initial decomposition temperature around 350-400 °C, and a high water contact angle (up to 108.06°) even after outdoor exposure for a month. These POSSs and their derivatives are expected to find uses in various applications such as stain resistance, self-cleaning, scratch resistance, and cigarette moxibustion resistance of wood furniture, kitchenware, and medical and industrial appliances.
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Affiliation(s)
- Peng Zhang
- South
China Advanced Institute for Soft Matter Science and Technology (AISMST),
School of Emergent Soft Matter, South China
University of Technology, Guangzhou 510640, People’s Republic
of China
- Guangdong
Provincial Key Laboratory of Functional and Intelligent Hybrid Materials
and Devices, South China University of Technology, Guangzhou 510640, People’s Republic of China
| | - Ban Qin
- South
China Advanced Institute for Soft Matter Science and Technology (AISMST),
School of Emergent Soft Matter, South China
University of Technology, Guangzhou 510640, People’s Republic
of China
- Guangdong
Provincial Key Laboratory of Functional and Intelligent Hybrid Materials
and Devices, South China University of Technology, Guangzhou 510640, People’s Republic of China
| | - Jianhui Xia
- South
China Advanced Institute for Soft Matter Science and Technology (AISMST),
School of Emergent Soft Matter, South China
University of Technology, Guangzhou 510640, People’s Republic
of China
- Guangdong
Provincial Key Laboratory of Functional and Intelligent Hybrid Materials
and Devices, South China University of Technology, Guangzhou 510640, People’s Republic of China
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2
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Enantiotropy of Simvastatin as a Result of Weakened Interactions in the Crystal Lattice: Entropy-Driven Double Transitions and the Transient Modulated Phase as Seen by Solid-State NMR Spectroscopy. Molecules 2022; 27:molecules27030679. [PMID: 35163943 PMCID: PMC8838109 DOI: 10.3390/molecules27030679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 01/17/2022] [Accepted: 01/18/2022] [Indexed: 12/01/2022] Open
Abstract
In crystalline molecular solids, in the absence of strong intermolecular interactions, entropy-driven processes play a key role in the formation of dynamically modulated transient phases. Specifically, in crystalline simvastatin, the observed fully reversible enantiotropic behavior is associated with multiple order–disorder transitions: upon cooling, the dynamically disordered high-temperature polymorphic Form I is transformed to the completely ordered low-temperature polymorphic Form III via the intermediate (transient) modulated phase II. This behavior is associated with a significant reduction in the kinetic energy of the rotating and flipping ester substituents, as well as a decrease in structural ordering into two distinct positions. In transient phase II, the conventional three-dimensional structure is modulated by periodic distortions caused by cooperative conformation exchange of the ester substituent between the two states, which is enabled by weakened hydrogen bonding. Based on solid-state NMR data analysis, the mechanism of the enantiotropic phase transition and the presence of the transient modulated phase are documented.
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Brząkalski D, Przekop RE, Frydrych M, Pakuła D, Dobrosielska M, Sztorch B, Marciniec B. Where ppm Quantities of Silsesquioxanes Make a Difference-Silanes and Cage Siloxanes as TiO 2 Dispersants and Stabilizers for Pigmented Epoxy Resins. MATERIALS 2022; 15:ma15020494. [PMID: 35057213 PMCID: PMC8779391 DOI: 10.3390/ma15020494] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 12/10/2021] [Accepted: 01/05/2022] [Indexed: 11/23/2022]
Abstract
In this work, silsesquioxane and spherosilicate compounds were assessed as novel organosilicon coupling agents for surface modification of TiO2 in a green process, and compared with their conventional silane counterparts. The surface-treated TiO2 particles were then applied in preparation of epoxy (EP) composites and the aspects of pigment dispersion, suspension stability, hiding power, as well as the composite mechanical and thermal properties were discussed. The studied compounds loading was between 0.005–0.015% (50–150 ppm) in respect to the bulk composite mass and resulted in increase of suspension stability and hiding power by over an order of magnitude. It was found that these compounds may be an effective alternative for silane coupling agents, yet due to their low cost and simplicity of production and manipulation, silanes and siloxanes are still the most straight-forward options available. Nonetheless, the obtained findings might encourage tuning of silsesquioxane compounds structure and probably process itself if implementation of these novel organosilicon compounds as surface treatment agents is sought for special applications, e.g., high performance coating systems.
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Affiliation(s)
- Dariusz Brząkalski
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, 8 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland; (D.B.); (M.F.); (D.P.)
| | - Robert E. Przekop
- Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, 10 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland;
- Correspondence: or (R.E.P.); (B.M.)
| | - Miłosz Frydrych
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, 8 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland; (D.B.); (M.F.); (D.P.)
| | - Daria Pakuła
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, 8 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland; (D.B.); (M.F.); (D.P.)
| | - Marta Dobrosielska
- Faculty of Materials Science and Engineering, Warsaw University of Technology, 141 Wołoska, 02-507 Warsaw, Poland;
| | - Bogna Sztorch
- Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, 10 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland;
| | - Bogdan Marciniec
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, 8 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland; (D.B.); (M.F.); (D.P.)
- Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, 10 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland;
- Correspondence: or (R.E.P.); (B.M.)
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Parshina MS, Tarasenkov AN, Aysin RR, Tebeneva NA, Buzin MI, Afanasyev ES, Serenko OA, Muzafarov AM. Monitoring the curing processes of epoxy oligomers with partially substituted polyethoxymetallosiloxanes by
IR
spectroscopy and thermomechanical analysis. J Appl Polym Sci 2021. [DOI: 10.1002/app.50918] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Maria S. Parshina
- N.S. Enikolopov Institute of Synthetic Polymeric Materials Russian Academy of Sciences Moscow Russia
- A.N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences Moscow Russia
| | - Alexander N. Tarasenkov
- N.S. Enikolopov Institute of Synthetic Polymeric Materials Russian Academy of Sciences Moscow Russia
| | - Rinat R. Aysin
- A.N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences Moscow Russia
| | - Nadezhda A. Tebeneva
- N.S. Enikolopov Institute of Synthetic Polymeric Materials Russian Academy of Sciences Moscow Russia
| | - Michail I. Buzin
- A.N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences Moscow Russia
| | - Egor S. Afanasyev
- A.N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences Moscow Russia
| | - Olga A. Serenko
- A.N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences Moscow Russia
| | - Aziz M. Muzafarov
- N.S. Enikolopov Institute of Synthetic Polymeric Materials Russian Academy of Sciences Moscow Russia
- A.N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences Moscow Russia
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Hydrophobic Epoxy Caged Silsesquioxane Film (EP-POSS): Synthesis and Performance Characterization. NANOMATERIALS 2021; 11:nano11020472. [PMID: 33673301 PMCID: PMC7918221 DOI: 10.3390/nano11020472] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 01/31/2021] [Accepted: 02/04/2021] [Indexed: 01/22/2023]
Abstract
Hydrophobic films are widely used in aerospace, military weapons, high-rise building exterior glass, and non-destructive pipeline transportation due to their antifouling and self-cleaning properties. This paper details the successful preparation of hydrophobic epoxy caged sesquioxane (EP-POSS) via two steps of simple organic synthesis, along with studies on the effects of viscosity and reaction time on the reaction. Interestingly, the EP-POSS presented a large contact angle of 125°, indicating its excellent hydrophobicity. The surface micromorphology was observed via FE-SEM (field emission scanning electron microscopy), transmission electron microscopy (TEM), and atomic force microscopy (AFM), and the structural composition and elemental contents were analyzed via X-ray photoelectron spectroscopy (XPS) and energy-dispersive spectrometry (EDS). Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) tests showed that EP-POSS had excellent thermal properties, and the first degradation reaction occurred at 354 °C. The mechanical performance and abrasion resistance results demonstrated that EP-POSS could be used in solar panels.
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Brus J, Czernek J, Urbanova M, Rohlíček J, Plecháček T. Transferring Lithium Ions in the Nanochannels of Flexible Metal-Organic Frameworks Featuring Superchaotropic Metallacarborane Guests: Mechanism of Ionic Conductivity at Atomic Resolution. ACS APPLIED MATERIALS & INTERFACES 2020; 12:47447-47456. [PMID: 32975402 DOI: 10.1021/acsami.0c12293] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Metal-organic frameworks (MOFs), owing to their unique architecture, attract consistent attention in the design of high-performance Li battery materials. Here, we report a new category of ion-conducting crystalline materials for all-solid-state electrolytes based on an MIL53(Al) framework featuring a superchaotropic metallacarborane (Li+CoD-) salt and present the first quantitative data on Li+ ion sites, local dynamics, chemical exchange, and the formation of charge-transfer pathways. We used multinuclear solid-state nuclear magnetic resonance (ss-NMR) spectroscopy to examine the mechanism of ionic conductivity at atomic resolution and to elucidate order-disorder processes, framework-ion interactions, and framework breathing during the loading of Li+CoD- species and transfer of Li+ ions. In this way, the MIL53(Al)@LiCoD framework was found to adopt an open-pore conformation accompanied by a minor fraction of narrow-pore channels. The inserted Li+ ions have two states (free and bound), which both exhibit extensive motions. Both types of Li+ ions form mutually communicating chains, which are large enough to enable efficient long-range charge transfer and macroscopic conductivity. The superchaotropic anions undergo high-amplitude uniaxial rotation motions supporting the transfer of Li+ cations along them, while the fluctuations of MOF aromatic linkers support the penetration of Li+ through the channel walls. Our findings provide a detailed atomic-resolution insight into the mechanism of ionic conductivity and thus have significant implications for the design of the next generation of energy-related materials.
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Affiliation(s)
- Jiri Brus
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovsky sq. 2, 162 06 Prague 6 Czech Republic
| | - Jiri Czernek
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovsky sq. 2, 162 06 Prague 6 Czech Republic
| | - Martina Urbanova
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovsky sq. 2, 162 06 Prague 6 Czech Republic
| | - Jan Rohlíček
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, Prague 8 182 21, Czech Republic
| | - Tomáš Plecháček
- Faculty of Chemical Technology, Joint Laboratory of Solid-State Chemistry, University of Pardubice, Studentska 84, 532 10 Pardubice, Czech Republic
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7
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Horodecka S, Strachota A, Mossety-Leszczak B, Šlouf M, Zhigunov A, Vyroubalová M, Kaňková D, Netopilík M. Meltable copolymeric elastomers based on polydimethylsiloxane with multiplets of pendant liquid-crystalline groups as physical crosslinker: A self-healing structural material with a potential for smart applications. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2020.109962] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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9
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Máková V, Holubová B, Tetour D, Brus J, Řezanka M, Rysová M, Hodačová J. (1 S,2 S)-Cyclohexane-1,2-diamine-based Organosilane Fibres as a Powerful Tool Against Pathogenic Bacteria. Polymers (Basel) 2020; 12:polym12010206. [PMID: 31947556 PMCID: PMC7023662 DOI: 10.3390/polym12010206] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Revised: 01/08/2020] [Accepted: 01/12/2020] [Indexed: 02/07/2023] Open
Abstract
An urgent need to find an effective solution to bacterial resistance is pushing worldwide research for highly effective means against this threat. Newly prepared hybrid organosilane fibres consisting of a (1S,2S)-cyclohexane-1,2-diamine derivative, interconnected in the fibre network via covalent bonds, were fully characterised via different techniques, including FTIR, TGA-FTIR, SEM-EDS, and solid-state NMR. Fibrous samples were successfully tested against two types of pathogenic bacterial strains, namely Staphylococcus aureus, and Pseudomonas aeruginosa. The obtained results, showing >99.9% inhibition against Staphylococcus aureus and Pseudomonas aeruginosa in direct contact compared to the control, may help particularly in case of infections, where there is an urgent need to treat the infection in direct contact. From this point of view, the above-mentioned fibrous material may find application in wound healing. Moreover, this new material has a positive impact on fibroblasts viability.
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Affiliation(s)
- Veronika Máková
- Department of Nanomaterials in Natural Science, Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 1402/2, 461 17 Liberec, Czech Republic; (B.H.); (M.Ř.)
- Correspondence: ; Tel.: +420-485-353-863
| | - Barbora Holubová
- Department of Nanomaterials in Natural Science, Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 1402/2, 461 17 Liberec, Czech Republic; (B.H.); (M.Ř.)
| | - David Tetour
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague, Czech Republic; (D.T.); (J.H.)
| | - Jiří Brus
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague, Czech Republic;
| | - Michal Řezanka
- Department of Nanomaterials in Natural Science, Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 1402/2, 461 17 Liberec, Czech Republic; (B.H.); (M.Ř.)
| | - Miroslava Rysová
- Department of Nanomaterials and Informatics, Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 1402/2, 461 17 Liberec, Czech Republic;
| | - Jana Hodačová
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague, Czech Republic; (D.T.); (J.H.)
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10
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Li S, Chen M, Su L, Lin X, Liu C. Highly efficient multielement flame retardant for multifunctional epoxy resin with satisfactory thermal, flame‐retardant, and mechanical properties. POLYM ADVAN TECHNOL 2019. [DOI: 10.1002/pat.4758] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Shanshan Li
- Fujian Key Laboratory of Polymer Materials, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, College of Chemistry and Materials ScienceFujian Normal University Fuzhou China
| | - Mingfeng Chen
- Fujian Key Laboratory of Polymer Materials, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, College of Chemistry and Materials ScienceFujian Normal University Fuzhou China
| | - Liping Su
- Fujian Key Laboratory of Polymer Materials, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, College of Chemistry and Materials ScienceFujian Normal University Fuzhou China
| | - Xiuhuang Lin
- Fujian Key Laboratory of Polymer Materials, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, College of Chemistry and Materials ScienceFujian Normal University Fuzhou China
| | - Canpei Liu
- Fujian Key Laboratory of Polymer Materials, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, College of Chemistry and Materials ScienceFujian Normal University Fuzhou China
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Abstract
Two polymorphs of the drug compound metergoline (C25H29N3O2) were investigated in detail by solid-state NMR measurements. The results have been analysed by an advanced procedure, which uses experimental input together with the results of quantum chemical calculations that were performed for molecular crystals. In this way, it was possible to assign the total of 40 1H–13C correlation pairs in a highly complex system, namely, in the dynamically disordered polymorph with two independent molecules in the unit cell of a large volume of 4234 Å3. For the simpler polymorph, which exhibits only small-amplitude motions and has just one molecule in the unit cell with a volume of 529.0 Å3, the values of the principal elements of the 13C chemical shift tensors were measured. Additionally, for this polymorph, a set of crystal structure predictions were generated, and the {13C, 1H} isotropic and 13C anisotropic chemical shielding data were computed while using the gauge-including projector augmented-wave approach combined with the “revised Perdew-Burke-Ernzerhof“ exchange-correlation functional (GIPAW-RPBE). The experimental and theoretical results were combined in an application of the newly developed strategy to polymorph discrimination. This research thus opens up new routes towards more accurate characterization of the polymorphism of drug formulations.
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Brus J, Czernek J, Hruby M, Svec P, Kobera L, Abbrent S, Urbanova M. Efficient Strategy for Determining the Atomic-Resolution Structure of Micro- and Nanocrystalline Solids within Polymeric Microbeads: Domain-Edited NMR Crystallography. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00392] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Jiri Brus
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Jiri Czernek
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Martin Hruby
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Pavel Svec
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Libor Kobera
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Sabina Abbrent
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Martina Urbanova
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
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A novel insight into the origin of toughness in polypropylene–calcium carbonate microcomposites: Multivariate analysis of ss-NMR spectra. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.10.071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Brus J, Urbanova M, Czernek J, Pavelkova M, Kubova K, Vyslouzil J, Abbrent S, Konefal R, Horský J, Vetchy D, Vysloužil J, Kulich P. Structure and Dynamics of Alginate Gels Cross-Linked by Polyvalent Ions Probed via Solid State NMR Spectroscopy. Biomacromolecules 2017. [PMID: 28636347 DOI: 10.1021/acs.biomac.7b00627] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Alginate gels are an outstanding biomaterial widely applicable in tissue engineering, medicine, and pharmacy for cell transplantation, wound healing and efficient bioactive agent delivery, respectively. This contribution provides new and comprehensive insight into the atomic-resolution structure and dynamics of polyvalent ion-cross-linked alginate gels in microbead formulations. By applying various advanced solid-state NMR (ssNMR) spectroscopy techniques, we verified the homogeneous distribution of the cross-linking ions in the alginate gels and the high degree of ion exchange. We also established that the two-component character of the alginate gels arises from the concentration fluctuations of residual water molecules that are preferentially localized along polymer chains containing abundant mannuronic acid (M) residues. These hydrated M-rich blocks tend to self-aggregate into subnanometer domains. The resulting coexistence of two types of alginate chains differing in segmental dynamics was revealed by 1H-13C dipolar profile analysis, which indicated that the average fluctuation angles of the stiff and mobile alginate segments were about 5-9° or 30°, respectively. Next, the 13C CP/MAS NMR spectra indicated that the alginate polymer microstructure was strongly dependent on the type of cross-linking ion. The polymer chain regularity was determined to systematically decrease as the cross-linking ion radius decreased. Consistent with the 1H-1H correlation spectra, regular structures were found for the gels cross-linked by relatively large alkaline earth cations (Ba2+, Sr2+, or Ca2+), whereas the alginate chains cross-linked by bivalent transition metal ions (Zn2+) and trivalent metal cations (Al3+) exhibited significant irregularities. Notably, however, the observed disordering of the alginate chains was exclusively attributed to the M residues, whereas the structurally well-defined gels all contained guluronic acid (G) residues. Therefore, a key role of the units in M-rich blocks as mediators promoting the self-assembly of alginate chains was experimentally confirmed. Finally, combining 2D 27Al 3Q/MAS NMR spectroscopy with density functional theory (DFT) calculations provided previously unreported insight into the structure of the Al3+ cross-linking centers. Notably, even with a low residual amount of water, these cross-linking units adopt exclusively 6-fold octahedral coordination and exhibit significant motion, which considerably reduces quadrupolar coupling constants. Thus, the experimental strategy presented in this study provides a new perspective on cross-linked alginate structure and dynamics for which high-quality diffraction data at the atomic resolution level are inherently unavailable.
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Affiliation(s)
- Jiri Brus
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Martina Urbanova
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Jiri Czernek
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Miroslava Pavelkova
- University of Veterinary and Pharmaceutical Sciences , Faculty of Pharmacy, Department of Pharmaceutics, Palackeho tr. 1946/1, 612 42 Brno, Czech Republic
| | - Katerina Kubova
- University of Veterinary and Pharmaceutical Sciences , Faculty of Pharmacy, Department of Pharmaceutics, Palackeho tr. 1946/1, 612 42 Brno, Czech Republic
| | - Jakub Vyslouzil
- University of Veterinary and Pharmaceutical Sciences , Faculty of Pharmacy, Department of Pharmaceutics, Palackeho tr. 1946/1, 612 42 Brno, Czech Republic
| | - Sabina Abbrent
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Rafal Konefal
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Jiri Horský
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - David Vetchy
- University of Veterinary and Pharmaceutical Sciences , Faculty of Pharmacy, Department of Pharmaceutics, Palackeho tr. 1946/1, 612 42 Brno, Czech Republic
| | - Jan Vysloužil
- Department of Biochemistry, Faculty of Science, Masaryk University , Kotlářská 267/2, 611 37, Brno, Czech Republic
| | - Pavel Kulich
- Department of Chemistry and Toxicology, Veterinary Research Institute , Hudcova 296/70, 621 00, Brno, Czech Republic
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Brus J, Albrecht W, Lehmann F, Geier J, Czernek J, Urbanova M, Kobera L, Jegorov A. Exploring the Molecular-Level Architecture of the Active Compounds in Liquisolid Drug Delivery Systems Based on Mesoporous Silica Particles: Old Tricks for New Challenges. Mol Pharm 2017; 14:2070-2078. [PMID: 28485970 DOI: 10.1021/acs.molpharmaceut.7b00167] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A general, easy-to-implement strategy for mapping the structure of organic phases integrated in mesoporous silica drug delivery devices is presented. The approach based on a few straightforward solid-state NMR techniques has no limitations regarding concentrations of the active compounds and enables straightforward discrimination of various organic phases. This way, among a range of typical arrangements of the active compounds and solvent molecules, a unique, previously unknown organogel phase of the self-assembled tapentadol in glucofurol as a solvent was unveiled and clearly identified. Subsequently, with an aid of 2D 1H-1H MAS NMR and high-level quantum-chemical calculations this uncommon low-molecular-weight organogel phase, existing exclusively in the porous system of the silica carrier, was described in detail. The optimized model revealed the tendency of tapentadol molecules to form hydrophobic arrangements through -OH···π interactions combined with π-π stacking occurring in the core of API aggregates, thus precluding the formation of hydrogen bonds with the solvent. Overall, the proposed experimental approach allows for clear discrimination of a variety of local structures of active compounds loaded in mesoporous silica drug delivery devices in reasonably short time being applicable for advancement of novel drug delivery systems in pharmaceutical industry.
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Affiliation(s)
- Jiri Brus
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | | | - Frank Lehmann
- Ratiopharm GmbH , Graf-Arco-Str. 3, 89079 Ulm, Germany
| | - Jens Geier
- Ratiopharm GmbH , Graf-Arco-Str. 3, 89079 Ulm, Germany
| | - Jiri Czernek
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Martina Urbanova
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Libor Kobera
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Alexand Jegorov
- Teva Czech Industries s.r.o. , Branisovska 31, 370 05 Ceske Budejovice, Czech Republic
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16
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17
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Blowing-out effect in flame retarding epoxy resins: Insight by temperature measurements during forced combustion. Polym Degrad Stab 2016. [DOI: 10.1016/j.polymdegradstab.2016.07.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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18
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Brus J, Kobera L, Urbanova M, Doušová B, Lhotka M, Koloušek D, Kotek J, Čuba P, Czernek J, Dědeček J. Interface Induced Growth and Transformation of Polymer-Conjugated Proto-Crystalline Phases in Aluminosilicate Hybrids: A Multiple-Quantum (23)Na-(23)Na MAS NMR Correlation Spectroscopy Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:2787-2797. [PMID: 26931131 DOI: 10.1021/acs.langmuir.5b04736] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Nanostructured materials typically offer enhanced physicochemical properties because of their large interfacial area. In this contribution, we present a comprehensive structural characterization of aluminosilicate hybrids with polymer-conjugated nanosized zeolites specifically grown at the organic-inorganic interface. The inorganic amorphous Al-O-Si framework is formed by alkali-activated low-temperature transformation of metakaoline, whereas simultaneous copolymerization of organic comonomers creates a secondary epoxide network covalently bound to the aluminosilicate matrix. This secondary epoxide phase not only enhances the mechanical integrity of the resulting hybrids but also introduces additional binding sites accessible for compensating negative charge on the aluminosilicate framework. This way, the polymer network initiates growth and subsequent transformation of protocrystalline short-range ordered zeolite domains that are located at the organic-inorganic interface. By applying an experimental approach based on 2D (23)Na-(23)Na double-quantum (DQ) MAS NMR spectroscopy, we discovered multiple sodium binding sites in these protocrystalline domains, in which immobilized Na(+) ions form pairs or small clusters. It is further demonstrated that these sites, the local geometry of which allows for the pairing of sodium ions, are preferentially occupied by Pb(2+) ions during the ion exchange. The proposed synthesis protocol thus allows for the preparation of a novel type of geopolymer hybrids with polymer-conjugated zeolite phases suitable for capturing and storage of metal cations. The demonstrated (23)Na-(23)Na DQ MAS NMR combined with DFT calculations represents a suitable approach for understanding the role of Na(+) ions in aluminositicate solids and related inorganic-organic hybrids, particularly their specific arrangement and clustering at interfacial areas.
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Affiliation(s)
- Jiri Brus
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Libor Kobera
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
- University of Ottawa , Department of Chemistry and CCRI, 10 Marie Curie Pvt. D'Iorio Hall, Ottawa, Ontario K1N6N5, Canada
| | - Martina Urbanova
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Barbora Doušová
- University of Chemistry and Technology Prague , Technicka 5, Prague, Czech Republic
| | - Miloslav Lhotka
- University of Chemistry and Technology Prague , Technicka 5, Prague, Czech Republic
| | - David Koloušek
- University of Chemistry and Technology Prague , Technicka 5, Prague, Czech Republic
| | - Jiří Kotek
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Pavel Čuba
- University of Chemistry and Technology Prague , Technicka 5, Prague, Czech Republic
| | - Jiri Czernek
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Jiří Dědeček
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic , Dolejskova 2155/3, 182 23 Prague 8, Czech Republic
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19
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Jennings J, Bassett SP, Hermida-Merino D, Portale G, Bras W, Knight L, Titman JJ, Higuchi T, Jinnai H, Howdle SM. How does dense phase CO2 influence the phase behaviour of block copolymers synthesised by dispersion polymerisation? Polym Chem 2016. [DOI: 10.1039/c5py01823d] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Using a CO2 continuous phase for dispersion synthesis of block copolymers can provide a useful handle to control phase behaviour.
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Affiliation(s)
- J. Jennings
- School of Chemistry
- University of Nottingham
- Nottingham
- UK
| | - S. P. Bassett
- School of Chemistry
- University of Nottingham
- Nottingham
- UK
| | - D. Hermida-Merino
- DUBBLE@ESRF
- Netherlands Organisation for Scientific Research (N.W.O.)
- Grenoble
- France
| | - G. Portale
- DUBBLE@ESRF
- Netherlands Organisation for Scientific Research (N.W.O.)
- Grenoble
- France
| | - W. Bras
- DUBBLE@ESRF
- Netherlands Organisation for Scientific Research (N.W.O.)
- Grenoble
- France
| | - L. Knight
- School of Chemistry
- University of Nottingham
- Nottingham
- UK
| | - J. J. Titman
- School of Chemistry
- University of Nottingham
- Nottingham
- UK
| | - T. Higuchi
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM)
- Tohoku University
- Sendai 980-8577
- Japan
| | - H. Jinnai
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM)
- Tohoku University
- Sendai 980-8577
- Japan
| | - S. M. Howdle
- School of Chemistry
- University of Nottingham
- Nottingham
- UK
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20
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21
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22
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Eldho KM, Rajamohanan PR, Anto R, Bulakh N, Lele AK, Ajithkumar TG. Insights into the Molecular Dynamics in Polysulfone Polymers from 13C Solid-State NMR Experiments. J Phys Chem B 2015; 119:11287-94. [DOI: 10.1021/acs.jpcb.5b03103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kavalakal Mathai Eldho
- Central NMR Facility and ‡Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Pune 411 008, India
| | - P. R. Rajamohanan
- Central NMR Facility and ‡Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Pune 411 008, India
| | - Ralf Anto
- Central NMR Facility and ‡Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Pune 411 008, India
| | - Neelima Bulakh
- Central NMR Facility and ‡Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Pune 411 008, India
| | - Ashish K. Lele
- Central NMR Facility and ‡Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Pune 411 008, India
| | - T. G. Ajithkumar
- Central NMR Facility and ‡Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Pune 411 008, India
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23
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Policianová O, Hodan J, Brus J, Kotek J. Origin of toughness in β-polypropylene: The effect of molecular mobility in the amorphous phase. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.01.047] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Zhang W, He X, Song T, Jiao Q, Yang R. Comparison of intumescence mechanism and blowing-out effect in flame-retarded epoxy resins. Polym Degrad Stab 2015. [DOI: 10.1016/j.polymdegradstab.2014.11.017] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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25
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Urbanova M, Sturcova A, Kredatusova J, Brus J. Structural insight into the physical stability of amorphous Simvastatin dispersed in pHPMA: Enhanced dynamics and local clustering as evidenced by solid-state NMR and Raman spectroscopy. Int J Pharm 2015; 478:464-75. [DOI: 10.1016/j.ijpharm.2014.12.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 12/04/2014] [Accepted: 12/05/2014] [Indexed: 11/29/2022]
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26
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Zhang W, He X, Song T, Jiao Q, Yang R. The influence of the phosphorus-based flame retardant on the flame retardancy of the epoxy resins. Polym Degrad Stab 2014. [DOI: 10.1016/j.polymdegradstab.2014.07.023] [Citation(s) in RCA: 96] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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27
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Brus J, Zhigunov A, Czernek J, Kobera L, Uchman M, Matějíček P. Control over the Self-Assembly and Dynamics of Metallacarborane Nanorotors by the Nature of the Polymer Matrix: A Solid-State NMR Study. Macromolecules 2014. [DOI: 10.1021/ma501117a] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Jiri Brus
- Institute of Macromolecular Chemistry, v.v.i., Academy
of Sciences of the Czech Republic, Heyrovský Sq. 2, 16206 Prague 6, Czech Republic
| | - Alexander Zhigunov
- Institute of Macromolecular Chemistry, v.v.i., Academy
of Sciences of the Czech Republic, Heyrovský Sq. 2, 16206 Prague 6, Czech Republic
| | - Jiří Czernek
- Institute of Macromolecular Chemistry, v.v.i., Academy
of Sciences of the Czech Republic, Heyrovský Sq. 2, 16206 Prague 6, Czech Republic
| | - Libor Kobera
- Institute of Macromolecular Chemistry, v.v.i., Academy
of Sciences of the Czech Republic, Heyrovský Sq. 2, 16206 Prague 6, Czech Republic
| | - Mariusz Uchman
- Department
of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 128
40 Prague 2, Czech Republic
| | - Pavel Matějíček
- Department
of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 128
40 Prague 2, Czech Republic
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28
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Effect of network mesh size on the thermo-mechanical properties of epoxy nanocomposites with the heavier homologue of POSS, the inorganic butylstannoxane cages. Eur Polym J 2014. [DOI: 10.1016/j.eurpolymj.2014.05.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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29
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Strachota A, Rodzeń K, Ribot F, Perchacz M, Trchová M, Steinhart M, Starovoytova L, Šlouf M, Strachota B. Tin-based “super-POSS” building blocks in epoxy nanocomposites with highly improved oxidation resistance. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.06.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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30
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Strachota A, Rodzeń K, Ribot F, Trchová M, Steinhart M, Starovoytova L, Pavlova E. Behavior of Tin-Based “Super-POSS” Incorporated in Different Bonding Situations in Hybrid Epoxy Resins. Macromolecules 2014. [DOI: 10.1021/ma500507j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Adam Strachota
- Institute
of Macromolecular Chemistry v.v.i., Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Krzysztof Rodzeń
- Institute
of Macromolecular Chemistry v.v.i., Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - François Ribot
- UPMC
Univ Paris 06, UMR 7574, Chimie de la Matière Condensée
de Paris, Sorbonne Universités, F-75005 Paris, France
- UMR
7574, Chimie de la Matière Condensée de Paris, CNRS, F-75005 Paris, France
- UMR
7574, Chimie de la Matière Condensée de Paris, Collège de France, F-75005 Paris, France
| | - Miroslava Trchová
- Institute
of Macromolecular Chemistry v.v.i., Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Miloš Steinhart
- Institute
of Macromolecular Chemistry v.v.i., Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Larisa Starovoytova
- Institute
of Macromolecular Chemistry v.v.i., Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Ewa Pavlova
- Institute
of Macromolecular Chemistry v.v.i., Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
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31
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Chmielewska D, Sterzyński T, Dudziec B. Epoxy compositions cured with aluminosilsesquioxanes: Thermomechanical properties. J Appl Polym Sci 2014. [DOI: 10.1002/app.40672] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Danuta Chmielewska
- Polymer Processing Division, Institute of Materials Technology; Poznan University of Technology; Piotrowo 3 61-138 Poznan Poland
| | - Tomasz Sterzyński
- Polymer Processing Division, Institute of Materials Technology; Poznan University of Technology; Piotrowo 3 61-138 Poznan Poland
| | - Beata Dudziec
- Department of Organometallic Chemistry, Faculty of Chemistry; Adam Mickiewicz University; Grunwaldzka 6 60-780 Poznan Poland
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32
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Bonhomme C, Gervais C, Laurencin D. Recent NMR developments applied to organic-inorganic materials. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2014; 77:1-48. [PMID: 24411829 DOI: 10.1016/j.pnmrs.2013.10.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 10/17/2013] [Indexed: 06/03/2023]
Abstract
In this contribution, the latest developments in solid state NMR are presented in the field of organic-inorganic (O/I) materials (or hybrid materials). Such materials involve mineral and organic (including polymeric and biological) components, and can exhibit complex O/I interfaces. Hybrids are currently a major topic of research in nanoscience, and solid state NMR is obviously a pertinent spectroscopic tool of investigation. Its versatility allows the detailed description of the structure and texture of such complex materials. The article is divided in two main parts: in the first one, recent NMR methodological/instrumental developments are presented in connection with hybrid materials. In the second part, an exhaustive overview of the major classes of O/I materials and their NMR characterization is presented.
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Affiliation(s)
- Christian Bonhomme
- Laboratoire de Chimie de la Matière Condensée de Paris, UMR CNRS 7574, Université Pierre et Marie Curie, Paris 06, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France.
| | - Christel Gervais
- Laboratoire de Chimie de la Matière Condensée de Paris, UMR CNRS 7574, Université Pierre et Marie Curie, Paris 06, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France
| | - Danielle Laurencin
- Institut Charles Gerhardt de Montpellier, UMR5253, CNRS UM2 UM1 ENSCM, CC1701, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France
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33
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Policianova O, Brus J, Hruby M, Urbanova M, Zhigunov A, Kredatusova J, Kobera L. Structural diversity of solid dispersions of acetylsalicylic acid as seen by solid-state NMR. Mol Pharm 2014; 11:516-30. [PMID: 24417442 DOI: 10.1021/mp400495h] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Solid dispersions of active pharmaceutical ingredients are of increasing interest due to their versatile use. In the present study polyvinylpyrrolidone (PVP), poly[N-(2-hydroxypropyl)-metacrylamide] (pHPMA), poly(2-ethyl-2-oxazoline) (PEOx), and polyethylene glycol (PEG), each in three Mw, were used to demonstrate structural diversity of solid dispersions. Acetylsalicylic acid (ASA) was used as a model drug. Four distinct types of the solid dispersions of ASA were created using a freeze-drying method: (i) crystalline solid dispersions containing nanocrystalline ASA in a crystalline PEG matrix; (ii) amorphous glass suspensions with large ASA crystallites embedded in amorphous pHPMA; (iii) solid solutions with molecularly dispersed ASA in rigid amorphous PVP; and (iv) nanoheterogeneous solid solutions/suspensions containing nanosized ASA clusters dispersed in a semiflexible matrix of PEOx. The obtained structural data confirmed that the type of solid dispersion can be primarily controlled by the chemical constitutions of the applied polymers, while the molecular weight of the polymers had no detectable impact. The molecular structure of the prepared dispersions was characterized using solid-state NMR, wide-angle X-ray scattering (WAXS), and differential scanning calorimetry (DSC). By applying various (1)H-(13)C and (1)H-(1)H correlation experiments combined with T1((1)H) and T1ρ((1)H) relaxation data, the extent of the molecular mixing was determined over a wide range of distances, from intimate intermolecular contacts (0.1-0.5 nm) up to the phase-separated nanodomains reaching ca. 500 nm. Hydrogen-bond interactions between ASA and polymers were probed by the analysis of (13)C and (15)N CP/MAS NMR spectra combined with the measurements of (1)H-(15)N dipolar profiles. Overall potentialities and limitations of individual experimental techniques were thoroughly evaluated.
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Affiliation(s)
- Olivia Policianova
- Institute of Macromolecular Chemistry , Academy of Sciences of the Czech Republic, Heyrovského nám. 2, 162 06 Praha 6, Czech Republic
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34
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Study on the change of silicon and phosphorus content in the condensed phase during the combustion of epoxy resin with OPS/DOPO. Polym Degrad Stab 2014. [DOI: 10.1016/j.polymdegradstab.2013.10.016] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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35
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Study on flame retardancy of TGDDM epoxy resins loaded with DOPO-POSS compound and OPS/DOPO mixture. Polym Degrad Stab 2014. [DOI: 10.1016/j.polymdegradstab.2013.11.015] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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36
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Zhang W, Li X, Yang R. Blowing-out effect and temperature profile in condensed phase in flame retarding epoxy resins by phosphorus-containing oligomeric silsesquioxane. POLYM ADVAN TECHNOL 2013. [DOI: 10.1002/pat.3170] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Wenchao Zhang
- National Laboratory of Flame Retardant Materials, School of Materials Science and Engineering; Beijing Institute of Technology; 5 South Zhongguancun Street, Haidian District Beijing 100081 China
| | - Xiangmei Li
- National Laboratory of Flame Retardant Materials, School of Materials Science and Engineering; Beijing Institute of Technology; 5 South Zhongguancun Street, Haidian District Beijing 100081 China
| | - Rongjie Yang
- National Laboratory of Flame Retardant Materials, School of Materials Science and Engineering; Beijing Institute of Technology; 5 South Zhongguancun Street, Haidian District Beijing 100081 China
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37
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Zhang W, Li X, Yang R. The degradation and charring of flame retarded epoxy resin during the combustion. J Appl Polym Sci 2013. [DOI: 10.1002/app.39689] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Wenchao Zhang
- National Laboratory of Flame Retardant Materials; School of Materials, Beijing Institute of Technology; Beijing; 100081; People's Republic of China
| | - Xiangmei Li
- National Laboratory of Flame Retardant Materials; School of Materials, Beijing Institute of Technology; Beijing; 100081; People's Republic of China
| | - Rongjie Yang
- National Laboratory of Flame Retardant Materials; School of Materials, Beijing Institute of Technology; Beijing; 100081; People's Republic of China
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38
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Chen P, Huang X, Zhang Q, Xi K, Jia X. Hybrid networks based on poly(styrene-co-maleic anhydride) and N-phenylaminomethyl POSS. POLYMER 2013. [DOI: 10.1016/j.polymer.2012.12.047] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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39
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Proks V, Brus J, Pop-Georgievski O, Večerníková E, Wisniewski W, Kotek J, Urbanová M, Rypáček F. Thermal-Induced Transformation of Polydopamine Structures: An Efficient Route for the Stabilization of the Polydopamine Surfaces. MACROMOL CHEM PHYS 2013. [DOI: 10.1002/macp.201200505] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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40
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Zhang W, Li X, Jiang Y, Yang R. Investigations of epoxy resins flame-retarded by phenyl silsesquioxanes of cage and ladder structures. Polym Degrad Stab 2013. [DOI: 10.1016/j.polymdegradstab.2012.10.005] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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41
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42
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Zhang W, Li X, Fan H, Yang R. Study on mechanism of phosphorus–silicon synergistic flame retardancy on epoxy resins. Polym Degrad Stab 2012. [DOI: 10.1016/j.polymdegradstab.2012.08.002] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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43
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Zhang W, Li X, Yang R. Blowing-out effect in epoxy composites flame retarded by DOPO-POSS and its correlation with amide curing agents. Polym Degrad Stab 2012. [DOI: 10.1016/j.polymdegradstab.2012.05.020] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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44
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Zhang W, Li X, Li L, Yang R. Study of the synergistic effect of silicon and phosphorus on the blowing-out effect of epoxy resin composites. Polym Degrad Stab 2012. [DOI: 10.1016/j.polymdegradstab.2012.03.008] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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45
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Zhao H, Shu J, Chen Q, Zhang S. Quantitative structural characterization of POSS and octavinyl-POSS nanocomposites by solid state NMR. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2012; 43-44:56-61. [PMID: 22503875 DOI: 10.1016/j.ssnmr.2012.02.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Revised: 12/24/2011] [Accepted: 02/15/2012] [Indexed: 05/31/2023]
Abstract
The ratio between two different (29)Si atoms in chloromethylphenyl isobutyl Polyhedral Oligomeric Silsesquioxane (POSS) was determined based on the quantitative cross polarization (QCP) (Shu et al., Chem. Phys. Lett. 462 (2008) 125) in solid-state NMR. For a (29)Si/(1)H spin system, cross polarization and depolarization together with the reciprocity relation were performed with optimized experimental conditions. It saves considerable experimental time compared to the (29)Si direct polarization experiment. The same method was further applied to octavinyl-POSS nanocomposites containing perfluoropolyether (PFPE) for deriving directly and accurately the average numbers of reacted vinyl groups, which may not be obtained by combining FTIR and solution (1)H NMR. In principle, the aforementioned method proves to be valuable in quantitative characterization of silicon related structures in bulk materials.
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Affiliation(s)
- Huipeng Zhao
- Shanghai Key Laboratory of Magnetic Resonance, Department of Physics, East China Normal University, Shanghai 200062, China
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46
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Brown SP. Applications of high-resolution 1H solid-state NMR. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2012; 41:1-27. [PMID: 22177472 DOI: 10.1016/j.ssnmr.2011.11.006] [Citation(s) in RCA: 184] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2011] [Revised: 11/15/2011] [Accepted: 11/16/2011] [Indexed: 05/25/2023]
Abstract
This article reviews the large increase in applications of high-resolution (1)H magic-angle spinning (MAS) solid-state NMR, in particular two-dimensional heteronuclear and homonuclear (double-quantum and spin-diffusion NOESY-like exchange) experiments, in the last five years. These applications benefit from faster MAS frequencies (up to 80 kHz), higher magnetic fields (up to 1 GHz) and pulse sequence developments (e.g., homonuclear decoupling sequences applicable under moderate and fast MAS). (1)H solid-state NMR techniques are shown to provide unique structural insight for a diverse range of systems including pharmaceuticals, self-assembled supramolecular structures and silica-based inorganic-organic materials, such as microporous and mesoporous materials and heterogeneous organometallic catalysts, for which single-crystal diffraction structures cannot be obtained. The power of NMR crystallography approaches that combine experiment with first-principles calculations of NMR parameters (notably using the GIPAW approach) are demonstrated, e.g., to yield quantitative insight into hydrogen-bonding and aromatic CH-π interactions, as well as to generate trial three-dimensional packing arrangements. It is shown how temperature-dependent changes in the (1)H chemical shift, linewidth and DQ-filtered signal intensity can be analysed to determine the thermodynamics and kinetics of molecular level processes, such as the making and breaking of hydrogen bonds, with particular application to proton-conducting materials. Other applications to polymers and biopolymers, inorganic compounds and bioinorganic systems, paramagnetic compounds and proteins are presented. The potential of new technological advances such as DNP methods and new microcoil designs is described.
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Affiliation(s)
- Steven P Brown
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom.
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Zhang R, Chen Y, Chen T, Sun P, Li B, Ding D. Accessing Structure and Dynamics of Mobile Phase in Organic Solids by Real-Time T1C Filter PISEMA NMR Spectroscopy. J Phys Chem A 2012; 116:979-84. [DOI: 10.1021/jp2078902] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rongchun Zhang
- School of Physics, Nankai University, Tianjin 300071, People's Republic of China
| | - Yuzhu Chen
- Key Laboratory of Functional Polymer Materials, Ministry of Education, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
| | - Tiehong Chen
- Key Laboratory of Functional Polymer Materials, Ministry of Education, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
| | - Pingchuan Sun
- Key Laboratory of Functional Polymer Materials, Ministry of Education, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
| | - Baohui Li
- School of Physics, Nankai University, Tianjin 300071, People's Republic of China
| | - Datong Ding
- School of Physics, Nankai University, Tianjin 300071, People's Republic of China
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Strachota A, Ribot F, Matějka L, Whelan P, Starovoytova L, Pleštil J, Steinhart M, Šlouf M, Hromádková J, Kovářová J, Špírková M, Strachota B. Preparation of Novel, Nanocomposite Stannoxane-Based Organic–Inorganic Epoxy Polymers containing Ionic bonds. Macromolecules 2011. [DOI: 10.1021/ma201178j] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Adam Strachota
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - François Ribot
- UPMC, Chimie de la Matière
Condensée de Paris (UMR 7574), Collège de France, 11 place Marcelin Berthelot, 75005 Paris,
France
- CNRS, Chimie de la
Matière
Condensée de Paris (UMR 7574), Collège de France, 11 place Marcelin Berthelot, 75005 Paris,
France
| | - Libor Matějka
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Paul Whelan
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Larisa Starovoytova
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Josef Pleštil
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Miloš Steinhart
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Miroslav Šlouf
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Jiřina Hromádková
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Jana Kovářová
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Milena Špírková
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Beata Strachota
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
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Chiu YC, Tsai HC, Imae T. Thermal degradation analysis of the isocyanate polyhedral oligomeric silsequioxanes (POSS)/sulfone epoxy nanocomposite. J Appl Polym Sci 2011. [DOI: 10.1002/app.35146] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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