scholarly journals POLYDENTATE ADSORBENT BASED ON LINEN CELLULOSE MODIFIED BY HYPERBRANCHED POLYESTER POLYBENZOYLTHIOCARBAMATE

2021 ◽  
pp. 79-85
Author(s):  
Ana Maria Hernandez Pinson ◽  
Aleksey Fedorovich Maksimov ◽  
Anastasiya Aleksandrovna Zhukova ◽  
Dariya Aleksandrovna Kudryashova ◽  
Kseniya Sergeyevna Momzyakova ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
13C Nmr ◽  
Thermal Effects ◽  
Hyperbranched Polymer ◽  
Acidic Medium ◽  
Adsorption Properties ◽  
Hyperbranched Polyester ◽  
Isobutyl Alcohol ◽  
Weight Method ◽  
Tga Analysis

A highly efficient hybrid adsorbent based on an industrially available, biodegradable, non-toxic linencellulose modified with hyperbranched polyesterpolybenzoylthiocarbamate has been synthesized.The synthesis was carried out using as a linkertoluene diisocyanate.The second-generation hyperbranched polyesterpolybenzoylthiocarbamate according to 1H, 13C NMR and IR spectroscopy contains 8 terminal benzoylthiocarbamate and 8 hydroxyl groups.In the first stage, the reaction of toluene diisociant with linen cellulose was carried out. By potentiometric titration, the content of toluene diisociant was found to be 27%. Then, hyperbranched polyesterpolybenzoylthiocarbamate was added to the modified linen cellulose. The content of hyperbranched polymer in cellulose, determined by the weight method, is 5%. Unreacted isocyanate groups are neutralized with isobutyl alcohol. The structure of the hybrid material is proven by IR spectroscopy. The adsorption properties of the polydentate adsorbent were studied with respect to Cu(II) ions. It was found that the adsorption capacity of the adsorbent is 6.93 mg/g. Using DSC and TGA analysis, the temperature characteristics, thermal effects, and mass loss of the obtained polydentate compound and its complexes were determined.It was shown that in an acidic medium at pH 3-4, desorption of Cu (II) and Co (II) ions occurs with the regeneration of a hybrid adsorbent.

scholarly journals (2S,3R,6R)-2-[(R)-1-Hydroxyallyl]-4,4-dimethoxy-6-methyltetrahydro-2H-pyran-3-ol

Molbank ◽  
10.3390/m1140 ◽  
2020 ◽  
Vol 2020 (2) ◽  
pp. M1140
Author(s):  
Jack Bennett ◽  
Paul Murphy
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Ir Spectroscopy ◽  
13C Nmr ◽  
Conjugate Addition ◽  
13C Nmr Spectroscopy ◽  
One Pot ◽  
1H And 13C Nmr ◽  
Esi Mass Spectrometry ◽  
The One

(2S,3R,6R)-2-[(R)-1-Hydroxyallyl]-4,4-dimethoxy-6-methyltetrahydro-2H-pyran-3-ol was isolated in 18% after treating the glucose derived (5R,6S,7R)-5,6,7-tris[(triethylsilyl)oxy]nona-1,8-dien-4-one with (1S)-(+)-10-camphorsulfonic acid (CSA). The one-pot formation of the title compound involved triethylsilyl (TES) removal, alkene isomerization, intramolecular conjugate addition and ketal formation. The compound was characterized by 1H and 13C NMR spectroscopy, ESI mass spectrometry and IR spectroscopy. NMR spectroscopy was used to establish the product structure, including the conformation of its tetrahydropyran ring.

scholarly journals Gas Porosimetry by Gas Adsorption as an Efficient Tool for the Assessment of the Shaping Effect in Commercial Zeolites

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1205
Author(s):  
Alejandro Orsikowsky-Sanchez ◽  
Christine Franke ◽  
Alexander Sachse ◽  
Eric Ferrage ◽  
Sabine Petit ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Strong Interaction ◽  
Gas Adsorption ◽  
Co2 Adsorption ◽  
Adsorption Properties ◽  
Preparation Process ◽  
Pore Filling ◽  
Irreversible Adsorption ◽  
Efficient Tool ◽  
4A Zeolite

A set of three commercial zeolites (13X, 5A, and 4A) of two distinct shapes have been characterized: (i) pure zeolite powders and (ii) extruded spherical beads composed of pure zeolite powders and an unknown amount of binder used during their preparation process. The coupling of gas porosimetry experiments using argon at 87 K and CO2 at 273 K allowed determining both the amount of the binder and its effect on adsorption properties. It was evidenced that the beads contain approximately 25 wt% of binder. Moreover, from CO2 adsorption experiments at 273 K, it could be inferred that the binder present in both 13X and 5A zeolites does not interact with the probe molecule. However, for the 4A zeolite, pore filling pressures were shifted and strong interaction with CO2 was observed leading to irreversible adsorption of the probe. These results have been compared to XRD, IR spectroscopy, and ICP-AES analysis. The effect of the binder in shaped zeolite bodies can thus have a crucial impact on applications in adsorption and catalysis.

scholarly journals Mechanism of the potential-triggered surface transformation of germanium in acidic medium studied by ATR-IR spectroscopy

2016 ◽  
Vol 18 (36) ◽  
pp. 25100-25109 ◽  
Author(s):  
Simantini Nayak ◽  
Andreas Erbe
Keyword(s):  
Ir Spectroscopy ◽  
Acidic Medium ◽  
Transient Species ◽  
Surface Transformation

During the electrochemical surface transformation of Ge(100) and Ge(111) surfaces from an –OH to an –H terminated surface, different potential dependent transient species are observed.

scholarly journals Adsorption Properties of Silica with Chemically Bonded Amino and Guanidino Groups

1997 ◽  
Vol 15 (3) ◽  
pp. 147-154 ◽  
Author(s):  
T.M. Roshchina ◽  
V.Ya. Davydov ◽  
N.M. Khrustaleva ◽  
A.A. Mandrugin ◽  
K.B. Gurevich
Keyword(s):  
Gas Chromatography ◽  
Ir Spectroscopy ◽  
Polymer Film ◽  
Polar Compounds ◽  
Adsorption Properties ◽  
Silica Support ◽  
Amino Groups ◽  
Organic Bases ◽  
Properties Of Materials ◽  
Static Conditions

The influence of the non-homogeneity of the silica support and the nature and amount of modifier employed on the adsorption properties of materials with chemically bonded amino and guanidino groups was studied by means of gas chromatography (GC), adsorption measurements under static conditions and IR spectroscopy. The results indicate that adsorbents coated with a polymer film of amino groups have a nearly uniform surface. These adsorbents can be used for GC investigations and for the separation of polar compounds, including organic bases.

Solid state 13C NMR and FT-IR spectroscopy of the cocoon silk of two common spiders

2005 ◽  
Vol 62 (1-3) ◽  
pp. 105-111 ◽  
Author(s):  
Emilia Bramanti ◽  
Donata Catalano ◽  
Claudia Forte ◽  
Mario Giovanneschi ◽  
Massimo Masetti ◽  
...  
Keyword(s):  
Solid State ◽  
Ir Spectroscopy ◽  
13C Nmr ◽  
Ft Ir ◽  
Ft Ir Spectroscopy ◽  
Solid State 13C Nmr

scholarly journals Synthesis and swelling behavior of polyurethane networks based on hyperbranched polymer

2011 ◽  
Vol 65 (6) ◽  
pp. 637-644 ◽  
Author(s):  
Jasna Dzunuzovic ◽  
Marija Pergal ◽  
Slobodan Jovanovic ◽  
Vesna Vodnik
Keyword(s):  
Ethylene Oxide ◽  
Hyperbranched Polymer ◽  
Chemical Structure ◽  
Crosslinking Agent ◽  
Swelling Behavior ◽  
Hydroxyl Groups ◽  
Hyperbranched Polyester ◽  
Polyurethane Networks ◽  
Methylenediphenyl Diisocyanate ◽  
Step Polymerization

A series of six polyurethane (PU) networks was synthesized from BoltornR hydroxy-functional hyperbranched polyester (HBP) of the second pseudo generation as a crosslinking agent, ?,?- dihydroxy-(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO) and 4,4?- methylenediphenyl diisocyanate, by a two-step polymerization in solution. Each sample of the prepared PUs had different EO-PDMS-EO content. The chemical structure of the synthesized networks was analyzed by FTIR spectroscopy. The influence of the EO-PDMS-EO content and type of the solvent on the swelling behavior of the PUs in 2-propanol and toluene was investigated. During the swelling measurements certain amount of sol fractions was extracted from the PUs by solvents. According to the 1H NMR results, sol fractions are mainly composed of the soluble hyperbranched PU, formed during the polymerization by partial modification of the end hydroxyl groups of HBP with NCO-terminated prepolymer synthesized in the first step of the reaction. Chains of the so reacted prepolymer can then fold back and form cyclic products by reaction of the free -NCO group from the NCO-terminated prepolymer with free -OH group of HBP. As the EO-PDMS-EO content increases the amount of the sol fractions and swelling degree also increased, indicating that networks with lower EO-PDMS-EO content are more crosslinked and have higher solvent resistance.

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