Synthesis of calcium sulphate as biomaterial

Zahari, Mohamad Abdul Aziz; Lee, S. P.; Kasim, Shah Rizal

doi:10.1063/5.0015693

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…This strong band is also detected in PPc–AII-ion composites (at about 1120 cm −1 ), which also show supplementary/distinct peaks at ca. 1150 cm −1 that are specific for the calcinated gypsum at high temperature [ 61 , 62 ]. To be complete, it is worth pointing out that the analysis of the FTIR spectra of composites obtained either with internal mixers or REx led to very similar conclusions ( Supplementary Material File S1 ).…”

Section: Resultsmentioning

confidence: 99%

Balancing the Strength–Impact Relationship and Other Key Properties in Polypropylene Copolymer–Natural CaSO4 (Anhydrite)-Filled Composites

Murariu

Laoutid

Paint

et al. 2023

IJMS

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To develop novel mineral-filled composites and assess their enhanced properties (stiffness, a good balance between mechanical strength and impact resistance, greater temperature stability), a high-impact polypropylene copolymer (PPc) matrix containing an elastomeric discrete phase was melt mixed with natural CaSO4 β-anhydrite II (AII) produced from gypsum rocks. First, in a prior investigation, the PPc composites filled with AII (without any modification) displayed enhanced stiffness, which is correlated with the relative content of the filler. The tensile and impact strengths dramatically decreased, especially at high filling (40 wt.%). Therefore, two key methods were considered to tune up their properties: (a) the ionomeric modification of PPc composites by reactive extrusion (REx) with zinc diacrylate (ZA), and (b) the melt mixing of PPc with AII surface modified with ethylenebis(stearamide) (EBS), which is a multifunctional processing/dispersant additive. The properties of composites produced with twin-screw extruders (TSEs) were deeply assessed in terms of morphology, mechanical, and thermal performance, including characterizations under dynamic mechanical solicitations at low and high temperatures. Two categories of products with distinct properties are obtained. The ionomeric modification by Rex (evaluated by FTIR) led to composites characterized by remarkable thermal stability, a higher temperature of crystallization, stronger interfacial interactions, and therefore noticeable mechanical properties (high tensile strength (i.e., 28 MPa), increased stiffness, moderate (3.3 kJ/m2) to good (5.0 kJ/m2) impact resistance) as well as advanced heat deflection temperature (HDT). On the other hand, the surface modification of AII with EBS facilitated the dispersion and debonding of microparticles, leading to composites revealing improved ductility (strain at break from 50% to 260%) and enhanced impact properties (4.3–5.3 kJ/m2), even at high filling. Characterized by notable mechanical and thermal performances, high whiteness, and a good processing ability, these new PPc–AII composites may be tailored to meet the requirements of end-use applications, ranging from packaging to automotive components.

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Section: Resultsmentioning

confidence: 99%

Balancing the Strength–Impact Relationship and Other Key Properties in Polypropylene Copolymer–Natural CaSO4 (Anhydrite)-Filled Composites

Murariu

Laoutid

Paint

et al. 2023

IJMS

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“…Bioresorbable materials are in demand in modern medicine for creation matrices that promote and support bone regeneration, thus eliminating the "gold standard" of using bone material taken from the human body [1,2]. Materials based on calcium phosphates with a molar ratio of 0.5 < Ca/P < 1.67, calcium carbonates [3] and calcium sulfates [4] have the ability to resorb when used in regenerative methods of bone defect treatment [5][6][7][8][9]. Different composite materials containing calcium sulfates and other components such as calcium phosphates [10][11][12][13][14] or calcium citrate tetrahydrate [15] in the phase composition are now under investigation.…”

Section: Introductionmentioning

confidence: 99%

“…Minerals presented in the CaO-K 2 O-SO 3 -H 2 O system mentioned above can be resorbed during implantation when interacting with physiological fluids. Some of these minerals are used as components [4,[25][26][27] of biocompatible materials. Some of them can be used due to the possibility of providing a neutral pH level by the obvious mechanism of dissolution of salts formed by a strong acid and a strong base [28].…”

Section: Introductionmentioning

confidence: 99%

Materials in the CaO-K2O-SO3-H2O System Based on Powder Mixtures including Calciolangbeinite K2Ca2(SO4)3 and Calcium Sulfate Anhydrite CaSO4

et al. 2023

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Materials (cement stone samples) in the CaO-K2O-SO3-H2O system with the target phase compositions, including syngenite K2Ca(SO4)2·H2O and calcium sulfate dihydrate CaSO4·2H2O, were prepared from powder mixtures of calcium sulfate anhydrite CaSO4, and/or calciolangbeinite K2Ca2(SO4)3, and potassium sulfate K2SO4 via hydration reactions at a water/powder ratio within an interval of 0.5–0.9. It was revealed that samples with contents of 25, 50, 75 and 100 mol% of syngenite K2Ca(SO4)2·H2O demonstrated a nonlinear dependence of their respective microstructures on their phase compositions. The microstructures of samples with phase compositions of 25 and 75 mol% of syngenite K2Ca(SO4)2·H2O consisted of pillar crystals. The microstructures of samples with phase compositions of 50 and 100 mol% of syngenite K2Ca(SO4)2·H2O consisted of plate crystals. An explanation of microstructure formation was set forth, taking into account equilibria of the dissolution–crystallization processes during cement stone formation. Materials obtained in the CaO-K2O-SO3-H2O system consisting of biocompatible and resorbable (soluble in water) phases can be recommended for testing as potential substances for bone defect treatments.

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“…Calcium sulfate has been known for over 100 years [1,2] as a relatively cheap biocompatible material widely used for orthopaedic, dental and pharmaceutical purposes [3]. Implants based on calcium sulfate are resorbed almost completely at in vivo assays [4,5] without causing inflammatory reactions.…”

Section: Introductionmentioning

confidence: 99%

“…When the temperature reaches 180-220 • C, water-soluble γ-anhydrite γ-CaSO 4 is formed, the polymorphic form of which exists up to temperatures of 300-350 • C. Further heating leads to the formation of insoluble β-anhydrite β-CaSO 4 , the polymorphic form of which exists up to temperatures of 800-1200 • C. β-CaSO 4 is widely met in nature, is stable at high temperatures, and has sufficient strength for use as bone material. At temperatures above 1200 • C, β-CaSO 4 transforms into a stable polymorphic form α-CaSO 4 [2,[7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Fine Biocompatible Powders Synthesized from Calcium Lactate and Ammonium Sulfate

et al. 2021

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Fine biocompatible powders with different phase compositions were obtained from a 0.5 M solution of ammonium sulfate (NH4)2SO4 and calcium lactate Ca(C3H5O3)2. The powder after synthesis and drying at 40 °C included calcium sulfate dehydrate CaSO4·2H2O and calcite CaCO3. The powder after heat treatment at 350 °C included β-hemihydrate calcium sulfate β-CaSO4·0.5H2O, γ-anhydrite calcium sulfate γ-CaSO4 and calcite CaCO3. The phase composition of powder heat-treated at 600 °C was presented as β-anhydrate calcium sulfate β-CaSO4 and calcite CaCO3. Increasing the temperature up to 800 °C leads to the sintering of a calcium sulfate powder consisting of β-anhydrite calcium sulfate β-CaSO4 main phase and a tiny amount of calcium oxide CaO. The obtained fine biocompatible powders of calcium sulfate both after synthesis and after heat treatment at temperature not above 600 °C can be recommended as a filler for producing unique composites with inorganic (glass, ceramic, cement) or polymer matrices.

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Synthesis of calcium sulphate as biomaterial

Cited by 4 publications

References 8 publications

Balancing the Strength–Impact Relationship and Other Key Properties in Polypropylene Copolymer–Natural CaSO4 (Anhydrite)-Filled Composites

Balancing the Strength–Impact Relationship and Other Key Properties in Polypropylene Copolymer–Natural CaSO4 (Anhydrite)-Filled Composites

Materials in the CaO-K2O-SO3-H2O System Based on Powder Mixtures including Calciolangbeinite K2Ca2(SO4)3 and Calcium Sulfate Anhydrite CaSO4

Fine Biocompatible Powders Synthesized from Calcium Lactate and Ammonium Sulfate

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