Relevant bibliographies by topics / Alkynes Thermal properties

Academic literature on the topic 'Alkynes Thermal properties'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Alkynes Thermal properties"

1

Michinobu, Tsuyoshi. "Click synthesis of donor–acceptor-type aromatic polymers." Pure and Applied Chemistry 82, no. 4 (March 13, 2010): 1001–9. http://dx.doi.org/10.1351/pac-con-09-09-09.

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A high-yielding addition reaction between electron-rich alkynes and a small acceptor molecule, tetracyanoethylene (TCNE), was employed as a new click reaction to construct donor–acceptor chromophores in the polymer main chains and side chains. The donor–acceptor alternating conjugated polymers were prepared from the ferrocene-containing poly(aryleneethynylene)s in one step and atom-economic fashion. The energy levels and thermal properties of the aromatic polyamines substituted by electron-rich alkynes as a side chain can be tunable by the amount of the added TCNE. The resulting donor–acceptor-type polymers feature broad charge-transfer (CT) bands in the visible region, potent redox activities, and improved thermal properties.
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Cervera-Procas, Ramón, José-Luis Serrano, and Ana Omenat. "A Highly Versatile Polymer Network Based on Liquid Crystalline Dendrimers." International Journal of Molecular Sciences 22, no. 11 (May 27, 2021): 5740. http://dx.doi.org/10.3390/ijms22115740.

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Highly functional macromolecules with a well-defined architecture are the key to designing efficient and smart materials, and these polymeric systems can be tailored for specific applications in a diverse range of fields. Herein, the formation of a new liquid crystalline polymeric network based on the crosslinking of dendrimeric entities by the CuI-catalyzed variant of the Huisgen 1,3-dipolar cycloaddition of azides and alkynes to afford 1,2,3-triazoles is reported. The polymeric material obtained in this way is easy to process and exhibits a variety of properties, which include mesomorphism, viscoelastic behavior, and thermal contraction. The porous microstructure of the polymer network determines its capability to absorb solvent molecules and to encapsulate small molecules, like organic dyes, which can be released easily afterwards. Moreover, all these properties may be easily tuned by modifying the chemical structure of the constituent dendrimers, which makes this system a very interesting one for a number of applications.
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3

Hernández-Fernández, Joaquín, John R. Castro-Suarez, and Carlos A. T. Toloza. "Iron Oxide Powder as Responsible for the Generation of Industrial Polypropylene Waste and as a Co-Catalyst for the Pyrolysis of Non-Additive Resins." International Journal of Molecular Sciences 23, no. 19 (October 3, 2022): 11708. http://dx.doi.org/10.3390/ijms231911708.

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For the synthesis of polymeric resins, it is of great importance to review the raw materials and the equipment to be used to avoid the presence of compounds that may affect the effectiveness of the polymerization and the characteristics of the plastic to be obtained. Iron oxide is a compound that can be present in reactors after maintenance due to the techniques used and the cleaning of this equipment, and it can affect the characteristics of the resins, reducing their quality. In this study, the presence of FeO in different concentrations was evaluated to determine its effects on the properties and pyrolysis of polypropylene resins by using X-ray refraction to determine the elements of the samples, evaluating thermal degradation by TGA, the variation in molecular weight by measuring the MFI, and the compounds obtained from pyrolysis by chromatography. The results showed that the thermal degradation decreased as the FeO concentration increased, while for the MFI, the relationship was directly proportional. The evaluation of the compounds obtained from pyrolysis showed an increase in the production of alcohols, alkynes, ketones, and acids, and a decrease in alkanes and alkenes, showing that FeO affects the properties of polypropylene and the compounds that are produced during pyrolysis.
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4

Schumann, Hans, Gert Admiraal, and Paul T. Beurskens. "Zum Koordinationsverhalten von Alkinen gegenüber dem [C5H5(P(OCH3)3)2Fe]+-Fragment: Bildung und Struktur carbonylfreier Halbsandwichkomplexe mit Alkin- und Vinylidenliganden / Coordination Properties of Alkynes towards the [C5H5Fe(P(OCH3)3)2]+ Fragment: Formation and Structure of Carbonylfree Halfsandwich Complexes with Alkyne and Vinylidene Ligands." Zeitschrift für Naturforschung B 47, no. 8 (August 1, 1992): 1125–33. http://dx.doi.org/10.1515/znb-1992-0813.

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The alkyne containing halfsandwich complexes [C5H5(P(OCH3)3)2Fe(HC ≡ CC6H5)]PF6 (IIIa) and [C5H5(P(OCH3)3)2Fe(CH3O2CC = CCO2CH3)]PF6 (IIIb) are accessible by thermal acetonitrile substitution from [C5H5(P(OCH3)3)2Fe(NCCH3)]PF6 (I) in the presence of the alkyne. Upon standing in solution, IIIa isomerizes to give the isomeric phenylvinylidene complex [C5H5(P(OCH3)3)2Fe(C=C(C6H5)H)]PF6 (IV). The spectroscopic data are presented together with a discussion of the X-ray structure determinations of IIIb and IV.
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Schock, Marvin, and Stefan Bräse. "Reactive & Efficient: Organic Azides as Cross-Linkers in Material Sciences." Molecules 25, no. 4 (February 24, 2020): 1009. http://dx.doi.org/10.3390/molecules25041009.

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The exceptional reactivity of the azide group makes organic azides a highly versatile family of compounds in chemistry and the material sciences. One of the most prominent reactions employing organic azides is the regioselective copper(I)-catalyzed Huisgen 1,3-dipolar cycloaddition with alkynes yielding 1,2,3-triazoles. Other named reactions include the Staudinger reduction, the aza-Wittig reaction, and the Curtius rearrangement. The popularity of organic azides in material sciences is mostly based on their propensity to release nitrogen by thermal activation or photolysis. On the one hand, this scission reaction is accompanied with a considerable output of energy, making them interesting as highly energetic materials. On the other hand, it produces highly reactive nitrenes that show extraordinary efficiency in polymer crosslinking, a process used to alter the physical properties of polymers and to boost efficiencies of polymer-based devices such as membrane fuel cells, organic solar cells (OSCs), light-emitting diodes (LEDs), and organic field-effect transistors (OFETs). Thermosets are also suitable application areas. In most cases, organic azides with multiple azide functions are employed which can either be small molecules or oligo- and polymers. This review focuses on nitrene-based applications of multivalent organic azides in the material and life sciences.
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6

Jiang, Wenzhao, Hangbo Yue, Peter Shuttleworth, Pengbo Xie, Shanji Li, and Jianwei Guo. "Adamantane-Based Micro- and Ultra-Microporous Frameworks for Efficient Small Gas and Toxic Organic Vapor Adsorption." Polymers 11, no. 3 (March 13, 2019): 486. http://dx.doi.org/10.3390/polym11030486.

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Microporous organic polymers and related porous materials have been applied in a wide range of practical applications such as adsorption, catalysis, adsorption, and sensing fields. However, some limitations, like wide pore size distribution, may limit their further applications, especially for adsorption. Here, micro- and ultra-microporous frameworks (HBPBA-D and TBBPA-D) were designed and synthesized via Sonogashira–Hagihara coupling of six/eight-arm bromophenyl adamantane-based “knots” and alkynes-type “rod” monomers. The BET surface area and pore size distribution of these frameworks were in the region of 395–488 m2 g−1, 0.9–1.1 and 0.42 nm, respectively. The as-made prepared frameworks also showed good chemical ability and high thermal stability up to 350 °C, and at 800 °C only 30% mass loss was observed. Their adsorption capacities for small gas molecules such as CO2 and CH4 was 8.9–9.0 wt % and 1.43–1.63 wt % at 273 K/1 bar, and for the toxic organic vapors n-hexane and benzene, 104–172 mg g−1 and 144–272 mg g−1 at 298 K/0.8 bar, respectively. These are comparable to many porous polymers with higher BET specific surface areas or after functionalization. These properties make the resulting frameworks efficient absorbent alternatives for small gas or toxic vapor capture, especially in harsh environments.
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7

Raytchev, Pascal Dimitrov, Céline Besset, Etienne Fleury, Jean-Pierre Pascault, Julien Bernard, and Eric Drockenmuller. "1,4:3,6-Dianhydrohexitols: Original platform for the design of biobased polymers using robust, efficient, and orthogonal chemistry." Pure and Applied Chemistry 85, no. 3 (August 15, 2012): 511–20. http://dx.doi.org/10.1351/pac-con-12-03-11.

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1,4:3,6-Dianhydrohexitols (DAHs) are nontoxic and sustainable diols that have been extensively applied as monomers for the preparation of polymer materials by step-growth polymerization processes. The presence of two reactive alcohol groups was exploited to design a library of symmetric and asymmetric stereocontrolled alkyne- and/or azide-functionalized AA/BB and AB monomers suitable for thermal or copper(I)-catalyzed azide-alkyne cycloaddition (TAAC and CuAAC). Step-growth polymerization of these monomers yielded a series of linear polytriazoles as well as partially biosourced networks using a combination of AB + A2B2 derivatives. Characterization of the resulting materials allowed for the establishment of a thorough structure–property relationship emphasizing the impact of monomer stereochemistry and cycloaddition regioselectivity on materials properties.
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Liu, Yu, Hai-Ying Wang, Gang Chen, Xiao-Ping Xu, and Shun-Jun Ji. "Synthesis and Properties of Novel 'Ethyne-linked' Compounds Containing Carbazole and 1, 8-naphthalimide Groups." Australian Journal of Chemistry 62, no. 8 (2009): 934. http://dx.doi.org/10.1071/ch08411.

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A series of the novel ‘ethyne-linked’ compounds containing carbazole and 1,8-naphthalimide groups have been synthesized by Pd/Cu-catalyzed Sonogashira reaction. These compounds were fully characterized by means of Fourier-transform IR, 1H, 13C NMR, and high resolution mass spectroscopy. The thermal, optical, and electrochemical properties were also investigated. As we expected, the results indicated that these compounds could improve charge-transport ability and fluorescent quantum yield by introducing the electron-transporting emitting moieties naphthalimide and the alkyne group to carbazole moieties.
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9

Hu, Yingxue, Joshua B. Marlow, Rajesh Ramanathan, Wenyue Zou, Hui Geok Tiew, Matthew J. Pottage, Vipul Bansal, Rico F. Tabor, and Brendan L. Wilkinson. "Synthesis and Properties of Photoswitchable Carbohydrate Fluorosurfactants." Australian Journal of Chemistry 68, no. 12 (2015): 1880. http://dx.doi.org/10.1071/ch15434.

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We describe the parallel synthesis, photocontrollable surface tension, and antibacterial performance of a new class of carbohydrate fluorosurfactant. Novel fluorosurfactants comprised a mono- or disaccharide head group linked to an azobenzene unit that was variably substituted with a trifluoromethyl group. Fluorosurfactants were rapidly assembled using the venerable CuI-catalysed azide–alkyne cycloaddition reaction and exhibited light-addressable surface activity, excellent water solubility, and selective antibacterial activity against Gram-positive Staphylococcus aureus. Notably, the physicochemical and biological activity of these novel materials was heavily dependent on the nature of the head group and the position of the trifluoromethyl substituent on the azobenzene ring. The UV-adapted cis-isomer of fluorosurfactants displayed good thermal stability at ambient temperature, with little reversion to the stable trans isomer after 16 h. These novel, light-responsive materials should find broad interest in a range of biomedical and technological fields, including drug and gene delivery, self-cleaning oleophobic surfaces, and antibacterial coatings for medical devices.
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10

Yu, Wen Hao, Yue Feng Bai, Yang Jing, Shi Chang Nie, Bi Qin Wang, Ping Hu, and Ke Qing Zhao. "Synthesis of Disk-Rod-Disk Liquid Crystal Trimers by Using Click Chemistry." Key Engineering Materials 428-429 (January 2010): 106–10. http://dx.doi.org/10.4028/www.scientific.net/kem.428-429.106.

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A series of disk-rod-disk liquid crystal trimers have been synthesized. Two triphenylene discogens have been connected to a biphenyl mesogen via CuI-NEt3 catalyzed alkyne azide cycloaddition in toluene at room temperature. The trimers have been characterized by using 1H NMR, IR, high resolution Mass spectra and the mesomorphic properties investigated with polarized optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray diffraction. The result shows that the trimers exhibited rectangular columnar mesophase (Colr). The length of the flexible spacer connecting the three segments has important influence on the thermal behaviors of the trimers.
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Conference papers on the topic "Alkynes Thermal properties"

1

Stojanov, Sonja, Ilija Bobinac, Mirjana Jovičić, Olga Govedarica, Jelena Pavličević, Julijana Blagojević, and Dragan Govedarica. "THE INFLUENCE OF ZNO NANOPARTICLES ON THE PROPERTIES OF HYPERBRANCHED ALKYD RESINS BASED ON CASTOR OIL." In 1st INTERNATIONAL Conference on Chemo and BioInformatics. Institute for Information Technologies, University of Kragujevac, 2021. http://dx.doi.org/10.46793/iccbi21.177s.

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Hyperbranched alkyds based on trimethylolpropane, dimethylol propionic acid and castor oil were synthesized. The process implied preparing the three samples with ZnO nanoparticles in an amount of 0, 1, and 3 wt%. Commercial melamine resin was used as a crosslinking agent. Curing was carried out firstly in a drying oven at the 120 °C for half an hour, and afterward for seven days at room temperature. Thermal properties, physico-mechanical characteristics, and chemical resistance of cured coated were determined. An increasing amount of the ZnO nanoparticles in hyperbranched alkyd resins leads to the improvement of the properties of the cured coating. Based on the results, it was concluded that the hyperbranched alkyds with ZnO nanoparticles could be employed as binders in environment-friendly coatings due to lower viscosity (less content of organic solvent) compared to conventional alkyd resins.
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