SYNTHESIS AND INVESTIGATION OF COPOLYMERS OF GLYCIDYLMETHACRYLATE  AND COPPER COMPLEX METHYL PHEOPHORBIDE “A” IN SOLUTION

The actual direction in the field of creating new functional materials is a complex study of the influence of tetrapyrrole macroheterocyclic compounds on the processes of radical (co)polymerization with widely used monomers, as well as the development of a general approach to the synthesis and study of the properties of such polymer materials. Promising macroheterocyclic compounds are chlorophyll derivatives of various structures. For this purpose, by the method of solution radical copolymerization in toluene and tetrahydrofuran the copolymers of glycidylmethacrylate and copper complex of methylpheophorbide “a” of various compositions were obtained. Identification of the obtained copolymers and investigation of their structure and properties were performed using data from IR, NMR spectroscopy of compounds, elemental and chemical analysis methods. The synthesized copolymers are characterized by molecular-weight characteristics which were determined by gel-permeation chromatography. It was found that the introduction of a copper complex of methylpheophorbide “a” into the copolymer leads to a decrease in the copolymerization rate, the values of the molecular masses of copolymers and an increase in their polydispersity. The effect of solvents on the time of the copolymerization process and the molecular weight characteristics of copolymers is shown. The composition of the obtained copolymers was determined spectrophotometrically by the optical density of their solutions at the maximum of the first absorption band of the copper complex of methylfeoforbide “a”. Comparison of the intensity of bands in the IR spectra of copolymers of different compositions showed that the content of methylpheophorbid links in the polymer chain increases with the increase in the content of porphyrin in the polymerized mixture. The study of the influence of the nature of the solvent and its structural features on chemical reactions involving porphyrin derivatives allowed us to establish that from a thermodynamic point of view, the best solvent for porphyrinpolymers is toluene.

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Study on Structure and Tanning Properties of Copolymer of Resorcinol and 3,5-Dihydroxyl Benzoic Acid

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.487.48 ◽

2012 ◽

Vol 487 ◽

pp. 48-52

Author(s):

Sheng Hua Lv ◽

Gong Rui ◽

Di Li

Keyword(s):

Molecular Weight ◽

Nuclear Magnetic Resonance ◽

Fourier Transform ◽

Infrared Spectroscopy ◽

Gel Permeation Chromatography ◽

Radical Copolymerization ◽

Mass Ratio ◽

Monomer Composition ◽

Chrome Tanning ◽

Gel Permeation

The radical copolymerization of resorcinol (RSC) and 3,5-dihydroxyl benzoic (DHBA) was carried out in water by the initiator of horseradish (HRP)/H2O2. It was discussed that the effects of monomer composition on the properties of the copolymer. The best monomer mass ratio of RSC:DHBA was 60:40 and the shrink temperature can reached to 88.5oC. The tanning result indicated that the copolymer of RSC and DHPA has particularly excellent tanning properties and can be served as leather tannage substitute for chrome tanning materials. And also the mechanism of the HRP initiated copolymerization was proposed. The structure and molecular weight of the copolymer was characterized by Fourier Transform Infrared spectroscopy (FTIR), Nuclear Magnetic Resonance (NMR) and Gel Permeation Chromatography (GPC). The copolymer can be as tannage and retannage in making leather process. The results showed that it has excellent tanning properties and retanning effects.

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Synthesis, Characterization and Copolymerization of N-(phenylamino)maleimide with MMA

E-Journal of Chemistry ◽

10.1155/2007/234768 ◽

2007 ◽

Vol 4 (2) ◽

pp. 265-271

Author(s):

B. L. Hiran ◽

S. N. Paliwal ◽

Jyoti Choudhary ◽

P. R. Choudhary

Keyword(s):

Thermal Stability ◽

Molecular Weight ◽

Density Measurement ◽

Gel Permeation Chromatography ◽

Radical Copolymerization ◽

Free Radical Copolymerization ◽

H Nmr ◽

Gel Permeation ◽

Ft Ir ◽

Thermal Stability Of

The free radical copolymerization of N-(phenylamino)maleimide (N-PAMI) was carried. The copolymerization with methyl methacrylate (MMA) was performed at 65°C with AIBN as the initiator in THF solvent. Resulting copolymer was characterized by density measurement, intrinsic viscosity, solubility, FT-IR &1H NMR spectroscopy. Effect of the solvent and time on copolymer yield was also investigated. The molecular weight of copolymer was determined by gel permeation chromatography (GPC). The thermal stability of copolymer was determined by Thermogravimetric analysis (TGA).

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Gel-permeation chromatography as a method for monitoring transformations of heavy petroleum fractions during secondary oil refining

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2021-87-8-5-11 ◽

2021 ◽

Vol 87 (8) ◽

pp. 5-11

Author(s):

E. V. Prudnikova ◽

S. G. Dyachkova ◽

Zh. N. Artemeva

Keyword(s):

Molecular Weight ◽

Raw Materials ◽

Gel Permeation Chromatography ◽

Vacuum Distillate ◽

Oil Refining ◽

Heavy Petroleum ◽

Polarity Index ◽

Molecular Weight Characteristics ◽

Gel Permeation ◽

Degree Of Association

A rapid and easy to use method for monitoring transformations of heavy oil fractions during secondary processes of oil refining is proposed. The method is based on the study of changes in the molecular weight characteristics by gel-permeation chromatography (GPC) using a refractometric detector. Optimal conditions for registration of the chromatograms (temperature, eluent consumption and its composition) were specified. Heptane, toluene, and toluene added with 1% and 5% of methanol were studied as eluents, the polarity indices being arranged in a series 0.2; 2.4; 2.43; 2.54. The effect of the nature of the solvent on the type of the product chromatogram is determined. It is shown that addition of a polar solvent to a nonpolar one increases the polarity index, reduces both the degree of association of petroleum molecules and adsorption on the gel. The most available toluene which meets the GPC requirements is chosen as an eluent. Addition of 1% CH3OH to the eluent promotes suppression of polyelectrolyte effects and adsorption. The revealed absence of the dependence of the retained volume and the type of chromatograms on the eluent flow rate and temperature indicates that separation is carried out under conditions of exclusion and completely obeys the theory of exclusive liquid chromatography. The transformation of raw materials during a technological process of oil production at the JSC «ANKhK» was studied using the GPC method under above-mentioned chromatographic conditions. We have studied vacuum distillate of the primary oil refining unit ELOU+AVT-6 (VD) and the product of hydrocracking of the vacuum distillate of the 123PM unit (HVD). It is shown that determination of the molecular weight characteristics provides an important information about the behavior of technological processes. The HVD meets the requirements for hydrocracking products. A decrease in the content of aromatic hydrocarbons in comparison with the raw feedstock is proved by the data of thin layer chromatography (TLC).

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Ultra-low-molecular-weight heparins: Precise structural features impacting specific anticoagulant activities

Thrombosis and Haemostasis ◽

10.1160/th12-11-0795 ◽

2013 ◽

Vol 109 (03) ◽

pp. 471-478 ◽

Cited By ~ 7

Author(s):

Marcelo Lima ◽

Christian Viskov ◽

Frederic Herman ◽

Angel Gray ◽

Eduardo de Farias ◽

...

Keyword(s):

Molecular Weight ◽

Gel Permeation Chromatography ◽

Structural Data ◽

Monosaccharide Composition ◽

Structural Features ◽

Therapeutic Agents ◽

Resonance Spectroscopy ◽

Low Molecular Weight ◽

Low Molecular Weight Heparins ◽

Molecular Weights

SummaryUltra-low-molecular-weight heparins (ULMWHs) with better efficacy and safety ratios are under development; however, there are few structural data available. The main structural features and molecular weight of ULMWHs were studied and compared to enoxaparin. Their monosaccharide composition and average molecular weights were determined and preparations studied by nuclear magnetic resonance spectroscopy, scanning ultraviolet spectroscopy, circular dichroism and gel permeation chromatography. In general, ULMWHs presented higher 3-O-sulphated glucosamine and unsaturated uronic acid residues, the latter being comparable with their higher degree of depolymerisation. The analysis showed that ULMWHs are structurally related to LMWHs; however, their monosaccharide/oligosaccharide compositions and average molecular weights differed considerably explaining their different anticoagulant activities. The results relate structural features to activity, assisting the development of new and improved therapeutic agents, based on depolymerised heparin, for the prophylaxis and treatment of thrombotic disorders.

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Iron-Based Catalytically Active Complexes in Preparation of Functional Materials

Processes ◽

10.3390/pr8121683 ◽

2020 ◽

Vol 8 (12) ◽

pp. 1683

Author(s):

Katarzyna Rydel-Ciszek ◽

Tomasz Pacześniak ◽

Izabela Zaborniak ◽

Paweł Błoniarz ◽

Karolina Surmacz ◽

...

Keyword(s):

Molecular Weight ◽

High Molecular Weight ◽

Noble Metals ◽

Functional Materials ◽

Cost Effective ◽

Polymer Materials ◽

High Molecular Weight Polymer ◽

Molecular Weight Polymer ◽

Iron Based ◽

Catalyst Systems

Iron complexes are particularly interesting as catalyst systems over the other transition metals (including noble metals) due to iron’s high natural abundance and mediation in important biological processes, therefore making them non-toxic, cost-effective, and biocompatible. Both homogeneous and heterogeneous catalysis mediated by iron as a transition metal have found applications in many industries, including oxidation, C-C bond formation, hydrocarboxylation and dehydration, hydrogenation and reduction reactions of low molecular weight molecules. These processes provided substrates for industrial-scale use, e.g., switchable materials, sustainable and scalable energy storage technologies, drugs for the treatment of cancer, and high molecular weight polymer materials with a predetermined structure through controlled radical polymerization techniques. This review provides a detailed statement of the utilization of homogeneous and heterogeneous iron-based catalysts for the synthesis of both low and high molecular weight molecules with versatile use, focusing on receiving functional materials with high potential for industrial application.

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The determination of molecular weight of proteins by gel permeation chromatography in organic solvents.

Journal of Biological Chemistry ◽

10.1016/s0021-9258(20)71263-9 ◽

1984 ◽

Vol 259 (19) ◽

pp. 11682-11685

Author(s):

S C Meredith

Keyword(s):

Molecular Weight ◽

Organic Solvents ◽

Gel Permeation Chromatography ◽

Gel Permeation

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Synthesis of poly(methyl methacrylate)-b-poly(acrylic acid) by DPE method

e-Polymers ◽

10.1515/epoly.2008.8.1.1051 ◽

2008 ◽

Vol 8 (1) ◽

Cited By ~ 2

Author(s):

Dong Chen ◽

Ruixue Liu ◽

Zhifeng Fu ◽

Yan Shi

Keyword(s):

Molecular Weight ◽

Acrylic Acid ◽

Methyl Methacrylate ◽

Diblock Copolymer ◽

Self Assembly ◽

Gel Permeation Chromatography ◽

Amphiphilic Diblock Copolymer ◽

Poly Methyl Methacrylate ◽

Copolymer Poly ◽

Poly Acrylic Acid

AbstractAmphiphilic diblock copolymer poly(methyl methacrylate)-b-poly(acrylic acid) (PMMA-b-PAA) was prepared by 1,1-diphenylethene (DPE) method. Firstly, free radical polymerization of methyl methacrylate was carried out with AIBN as initiator in the presence of DPE, giving a DPE-containing PMMA precursor with controlled molecular weight. tert-Butyl acrylate (tBA) was then polymerized in the presence of the PMMA precursor, and PMMA-b-PtBA diblock copolymer with controlled molecular weight was prepared. Finally, amphiphilic diblock copolymer PMMA-b-PAA was obtained by hydrolysis of PMMA-b-PtBA. The formation of PMMA-b-PAA was confirmed by 1H NMR spectrum and gel permeation chromatography. Transmission electron microscopy and dynamic light scattering were used to detect the self-assembly behavior of the amphiphilic diblock polymers in methanol.

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