A Green One-pot Synthesis of PDMS Bis-Macromonomers Using an Ecologic Catalyst (Maghnite-H<sup>+</sup>)

Hennaoui, Feriel; Belbachir, Mohammed

doi:10.1080/10601325.2015.1095602

Cited by 15 publications

(3 citation statements)

References 19 publications

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“…The mineral is filtered off and washed several times with distilled water up to pH 7. After filtration, Mag-H + is dried in an oven for 24 [23] and is then crushed. The composition of raw and treated Maghnite is given in Table 1 and the results show that the acid treatment leads to a decrease in Al2O3 concentration and silica enrichment in the material.…”

Section: Preparation Of Maghnite-h +mentioning

confidence: 99%

A Green Synthesis of Polylimonene Using Maghnite-H+, an Exchanged Montmorillonite Clay, as Eco-Catalyst

Derdar

Belbachir

Harrane

2018

Bull. Chem. React. Eng. Catal.

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A new green polymerization technique to synthesis polylimonene (PLM) is carried out in this work. This technique consists of using Maghnite-H + as eco-catalyst to replace Friedel-Crafts catalysts which are toxics. Maghnite-H + is a montmorillonite silicate sheet clay which is prepared through a simple exchange process. Polymerization experiments are performed in bulk and in solution using CH2Cl2 as solvent. Effect of reaction time, temperature and amount of catalyst is studied, in order to find the optimal reaction conditions. The polymerization in solution leads to the best yield (48.5%) at -5 °C for a reaction time of 6 h but the bulk polymerization, that is performed at 25 °C, remains preferred even if the yield is lower (40.3%) in order to respect the principles of a green chemistry which recommend syntheses under mild conditions, without solvents and at room temperature. The structure of the obtained polymer (PLM) is confirmed by FT-IR and Nuclear Magnetic Resonance of proton ( 1 H-NMR). The glass transition temperature (Tg) of the polylimonene is defined using Differential Scanning Calorimetry (DSC) and is between 113 °C and 116 °C. The molecular weight of the obtained polymer is determined by Gel Permeation Chromatography (GPC) analysis and is about 1360 g/mol.

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Section: Preparation Of Maghnite-h +mentioning

confidence: 99%

A Green Synthesis of Polylimonene Using Maghnite-H+, an Exchanged Montmorillonite Clay, as Eco-Catalyst

Derdar

Belbachir

Harrane

2018

Bull. Chem. React. Eng. Catal.

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“…Maghnite-H + is prepared according to the process reported in our previous study [16][17][18][19][20]. Maghnite-H + is activated with a sulfuric acid solution to give a Maghnite exchanged with protons, called Mag-H + .…”

Section: Preparation Of Maghnite-h +mentioning

confidence: 99%

Biosynthesis and Characteristics of Polyhydroxyalkanoates. 1. Polyhydroxybutyrates of Azotobacter vinelandii N-15

Semeniuk¹,

Pokynbroda²,

Кочубей³

et al. 2020

ChChT

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The biosynthesis of cellular polymers of Azotobacter vinelandii N-15 strain using molasses as a carbon source has been optimized. The highest yield of polymer (25.8 % of cell mass) was obtained on a nutrient medium with a molasses concentration of 50 g/l. Using TL-chromatography and IR-spectroscopy the obtained product was identified as polyhydroxybutyrate (PHB), and its properties were investigated. The wetting contact angle was used to characterize the biopolymer film surface properties. According to the results of thermal and thermomechanical studies, it was found that the obtained РHB is characterized by a high thermal stability and heat resistance: the melting point is 462 K; deep destruction and thermooxidative processes begin at the temperatures above 567 K.

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“…By acid activation of raw Maghnite with a 0.25M H 2 SO 4 solution, there is a complete cationic exchange of Maghnite by protons, without destroying its structure. 39 The Mag-H + obtained is widely used in the ring-opening polymerizations 26,[40][41][42][43][44][45] , also in the synthesis of bis-macromonomers 6,7,46 , and it has many advantages such as very low purchase price compared to other catalysts and the easy removal of the reaction mixture, regenerated by heating to a temperature above 373 K. 40,41 In our work, we were interested in using a new method for a green synthesis of telechelic PGPTMS with acetate and methacrylate end groups, in bulk, using one step, by cationic ring-opening polymerization of 3-glycidoxypropyltrimethoxysilane (GPTMS), in the presence of acetic anhydride (AA) and methacrylic anhydride (MA), using a green catalyst Mag-H + without spending energy. The best results in term of activation and yield of the product are determined using the kinetic study on the evolution of the synthesis reaction.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Sorption of Yttrium Ions by the Mutual Activated Hydrogels in the Interpolymer System of Poly(Methacrylic Acid) and Poly(4-Vinylpyridine)

Jumadilov¹,

Totkhuskyzy²,

Imangazy³

et al. 2023

ChChT

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This paper considers the effect of mutual activation of poly(methacrylic acid) (PMAA) and poly-(4 vinylpyridine) (P4VP) hydrogels during their remote interaction on the degree of yttrium ions sorption from an aqueous medium. Electrochemical properties were studied by conductometry and pH measurements to predict the activation possibility of these hydrogels. pH measurements showed that at 0.1 hour, the pH values were the lowest, indicating a high content of H+ ions in the aqueous solution. An increase in the interaction time to 24 hours leads to an increase in pH values, indicating a decrease in the content of H+ ions in the solution. The dependences of the specific electrical conductivity were studied. The experiments showed that the maximum values were observed at the ratios of 3 : 3 and 1 : 5 (gPMAA : gP4VP), which coincided with the result of pH measurements. The obtained results indicate the significant changes occurred in the electrochemical and conformational values of the initial macromolecules in the interpolymer system. Our research confirms the presence of remote interaction between hydrogels and their mutual activation.

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A Green One-pot Synthesis of PDMS Bis-Macromonomers Using an Ecologic Catalyst (Maghnite-H⁺)

Cited by 15 publications

References 19 publications

A Green Synthesis of Polylimonene Using Maghnite-H+, an Exchanged Montmorillonite Clay, as Eco-Catalyst

A Green Synthesis of Polylimonene Using Maghnite-H+, an Exchanged Montmorillonite Clay, as Eco-Catalyst

Biosynthesis and Characteristics of Polyhydroxyalkanoates. 1. Polyhydroxybutyrates of Azotobacter vinelandii N-15

Anomalous Sorption of Yttrium Ions by the Mutual Activated Hydrogels in the Interpolymer System of Poly(Methacrylic Acid) and Poly(4-Vinylpyridine)

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A Green One-pot Synthesis of PDMS Bis-Macromonomers Using an Ecologic Catalyst (Maghnite-H+)

Cited by 15 publications

References 19 publications

A Green Synthesis of Polylimonene Using Maghnite-H+, an Exchanged Montmorillonite Clay, as Eco-Catalyst

A Green Synthesis of Polylimonene Using Maghnite-H+, an Exchanged Montmorillonite Clay, as Eco-Catalyst

Biosynthesis and Characteristics of Polyhydroxyalkanoates. 1. Polyhydroxybutyrates of Azotobacter vinelandii N-15

Anomalous Sorption of Yttrium Ions by the Mutual Activated Hydrogels in the Interpolymer System of Poly(Methacrylic Acid) and Poly(4-Vinylpyridine)

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A Green One-pot Synthesis of PDMS Bis-Macromonomers Using an Ecologic Catalyst (Maghnite-H⁺)