Microstructure properties of poly(phospho-siloxo) geopolymeric network with metakaolin as sole binder reinforced with n-SiO2 and n-Al2O3

Vanitha, N.; Revathi, T.; Sivasakthi, M.; Jeyalakshmi, R.

doi:10.1016/j.jssc.2022.123188

Cited by 11 publications

(4 citation statements)

References 47 publications

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“…The crystallinity of a polymer refers to the degree to which there are regions where the polymer chains are aligned, and some degree of stereoregularity is required for this to occur. The degree of crystallinity can be explained as the ratio of the sum of the deconvoluted crystalline parts over the sum of the crystalline and the amorphous deconvoluted parts [ 24 ]. The calculation of the degree of crystallinity is obtained by deconvolution in the Gaussian curves and it is performed with six curves for the crystalline part and shaded area curves of the amorphous part, which is presented in Figure 2 and Figure 3 .…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, it is noticeable that the BGM2 and GM10 samples have above 70% of the amorphous phase in a structure, indicating that these two inorganic matrixes attach and incorporate organic polymers much better than other samples. The degree of crystallinity in samples varies between 25% and 50%, which shows that the proportion of crystalline phases refers to residual untransformed mineral phases originating from the raw clay that was used as a source of an aluminosilicate matrix [ 14 , 24 ]. This is in accordance with the material used, mostly untransformed grains of quartz and aluminosilicate minerals as found in the literature, and these materials can be said to be semi-crystalline polymer materials, where phosphate cement is most likely integrated into an amorphous matrix.…”

Section: Resultsmentioning

confidence: 99%

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Design of PEI and Amine Modified Metakaolin-Brushite Hybrid Polymeric Composite Materials for CO2 Capturing

et al. 2023

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In this paper, the properties of organic-inorganic hybrid polymer materials, which were synthesized from an aluminosilicate inorganic matrix with the addition of brushite and aminosilane grafted on one side and PEI covalently bonded composites on the other side, were examined. The synthesized organic-inorganic hybrid polymers were examined in terms of a structural, morphological, thermo-gravimetric, and adsorption-desorption analysis and also as potential CO2 capturers. The structural and phase properties as well as the percentage contents of the crystalline and amorphous phase were determined by the X-ray diffraction method. The higher content of the amorphous phase in the structure of hybrid polymers was proven in metakaolin and metakaolin-brushite hybrid samples with the addition of amino silane and with 1,000,000 PEI in a structure. The DRIFT method showed the main band changes with the addition of an organic phase and inorganic matrix. Microstructural studies with the EDS analysis showed a uniform distribution of organic and inorganic phases in the hybrid geopolymers. The thermo-gravimetric analysis showed that organic compounds are successfully bonded to inorganic polymer matrix, while adsorption-desorption analysis confirmed that the organic phase completely covered the surface of the inorganic matrix. The CO2 adsorption experiments showed that the amine-modified composites have the higher capture capacity, which is 0.685 mmol·g−1 for the GM10 sample and 0.581 mmol·g−1 for the BGM10 sample, with 1,000,000 PEI in the structure.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Design of PEI and Amine Modified Metakaolin-Brushite Hybrid Polymeric Composite Materials for CO2 Capturing

et al. 2023

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“…This improvement in properties at an early age was attributed to phosphorösslerite detected in the geopolymer paste after 1 day of curing and absent on the third day of curing [47]. The addition of NS and NA at a low dose of 1% aided in the structural development of the composite and provided an increase in compressive strength of 25% and 45%, respectively [59]. The incorporation of wood fiber can reduce brittleness and increase fracture toughness, but it is unfavorable to the setting and hardening behavior, and compressive strength of MKSAPG [60].…”

Section: Additivesmentioning

confidence: 97%

Acid Activation in Low-Carbon Binders: A Systematic Literature Review

Park,

Pimenta,

Bezerra

2023

Buildings

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Geopolymers have emerged as an alternative binding material to Ordinary Portland Cement (OPC). Recently, there has been an increase in studies exploring the synthesis of these materials using acid activation rather than traditional alkaline activation. This approach offers benefits such as good strength at an early age, better thermal properties, and a chemical activator that emits less carbon to be produced. In addition, it provides resistance to efflorescence and leaching, which are common challenges associated with alkali-activated products. This work analyzed the scientific advances in acid activation in synthesizing an alternative binder to OPC. To this end, a systematic review of the last five years of scientific literature was carried out using the Systematic Review for Engineering and Experiments (SREE) method. The results show a notable increase in research focused on acid activation over the last few years. The acid activators were always phosphate solutions, mainly phosphoric acid. Metakaolin was the most tested precursor, followed by fly ash, and volcanic ash. The research requires improvements in the methodological quality, providing data on molar ratios (Al/P, Si/Al, and Si/P), Liquid/Solid mass ratio, activator solution molarity, and curing process, in addition to statistical treatment and comparison of results. There exists a paucity of diversity in the examined precursors, activators, and additives. Future research developments need to clarify the behavior of mechanical resistance over time, better curing process, water resistance, durability, and the role of iron, magnesium, and calcium silicates and/or oxides. The paper identifies the main research gaps in the area and functions as a database, guiding researchers in selecting raw materials, dosing methodology, and curing processes.

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“…Geopolymers are concrete-like materials, they can be cast into molds taking the shape of a vessel, they can be a binder or they can be printed with the use of additive technologies [4][5][6][7]. Geopolymers are called alkaline activated materials (due to the first phase of geopolymer formation), they are created by combining aluminosilicate materials with alkaline compounds, strongly basic sodium, potassium or acid phosphates [1,[8][9][10][11]. By adding various types of fibers, stabilizers or foaming agents, the properties of these materials can be successfully controlled [12,13].…”

Section: Introductionmentioning

confidence: 99%

Influence of elevated temperatures on the mechanical properties of foamed geopolymer materials

Figiela

Korniejenko

Hebdowska-Krupa

2023

Materialwissenschaft Werkst

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Current research focuses heavily on geopolymer concrete as possible applications for insulation materials. The aim of the research is to test the strength properties of lightweight geopolymer concrete after exposure to high temperatures. Waste material from the Wieczorek mine (Poland) was used to produce the foamed geopolymers. Alkaline activation took place by mixing the mine powder with an aqueous solution of sodium hydroxide combined with an aqueous sodium silicate with a concentration of 10 M. Prepared geopolymer samples after temperature curing at 75 °C for 24 hours in a laboratory dryer, they were seasoned for 28 days, after which the strength properties were determined. Mechanical tests: compressive strength and bending strength were carried out at temperatures: 20 °C, 200 °C, 600 °C, 800 °C, 1100 °C. Research has shown the precursor activation with the presence of hydrogen peroxide enabled the manufacturing of foamed geopolymers. Heating in the temperature range up to 1100 °C influenced, to some extent, the total porosity of the tested foams. The geopolymer foams based on coal gangue present stable mechanical properties in the range up to 800 °C. No sharp mechanical performances decrease or material chipping was observed. Only colour change of heated samples occurred.

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Microstructure properties of poly(phospho-siloxo) geopolymeric network with metakaolin as sole binder reinforced with n-SiO2 and n-Al2O3

Cited by 11 publications

References 47 publications

Design of PEI and Amine Modified Metakaolin-Brushite Hybrid Polymeric Composite Materials for CO2 Capturing

Design of PEI and Amine Modified Metakaolin-Brushite Hybrid Polymeric Composite Materials for CO2 Capturing

Acid Activation in Low-Carbon Binders: A Systematic Literature Review

Influence of elevated temperatures on the mechanical properties of foamed geopolymer materials

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