Al2O3/chitosan nanocomposite: Preparation, characterization and kinetic study of its thermal degradation

Moussout, Hamou; Ahlafi, Hammou; Aazza, Mustapha; Amechrouq, Ali

doi:10.1016/j.tca.2018.08.023

Cited by 15 publications

(8 citation statements)

References 35 publications

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“…The VA method can also reduce the coupling errors of different parameters and yield more reliable E α . In the previous research, the apparent activation energy was obtained by model methods, such as Kissinger method, Flynn–Wall–Ozawa method, and autocatalytic method . The fitting of above three methods are simple and easy to obtain based on the actual data.…”

Section: Introductionmentioning

confidence: 99%

“…2,15,16 In the previous research, the apparent activation energy was obtained by model methods, such as Kissinger method, Flynn-Wall-Ozawa method, and autocatalytic method. [17][18][19] The fitting of above three methods are simple and easy to obtain based on the actual data. In general, the local incompatibility of the curing system was existed via model methods, especially the curing process is controlled by diffusion in the late curing stage.…”

Section: Introductionmentioning

confidence: 99%

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Construction of improved isothermal TTT cure diagram based on an epoxy–amine thermoset

Zhang

Wang

Liu

2018

J of Applied Polymer Sci

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Cure degree plays a pivotal role in determining the final properties of thermosetting resin, while the parameter cannot be visually presented by the classic isothermal time–temperature‐transformation (TTT) diagram. An improved isothermal TTT cure diagram is built for an epoxy–amine thermoset with the visual relationship between temperature, time, and cure degree during the whole curing. As for the improved isothermal TTT cure diagram, the curing surface and the gelation plane were developed using Vyazovkin method and rheological analysis in turn, and the variation between glass transition temperature (T g) and curing degree was described by Dibenedetto's equation. The obtained improved isothermal TTT diagram of epoxy–amine thermoset was constructed by the combination of calorimetric and rheological analysis. The fitting results of vitrification surface and gelation plane obtained via improved isothermal TTT diagram were in good agreement with experimental results. In addition, the experimental gelation curve of epoxy–amine thermoset is directly linked to the steepest location of curing surface. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47279.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Construction of improved isothermal TTT cure diagram based on an epoxy–amine thermoset

Zhang

Wang

Liu

2018

J of Applied Polymer Sci

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“…Figure 8 a shows the TGA curves of CS flakes and spheres. The first stage of degradation occurs between 35 °C to 200 °C, with a weight loss of approximately 12%, related to the evaporation of water molecules or small molecules [ 34 ]. According to the curve, these elements’ weight loss occurs more pronounced in the CS flakes than the CS spheres.…”

Section: Resultsmentioning

confidence: 99%

“…The second stage of degradation occurs between 200 °C to 550 °C, with a weight loss of 68% and 74%, corresponding to CS’s flakes and spheres, respectively. This stage is related to a complex process that involves the dehydration of the saccharide rings and the decomposition of the acetylated and deacetylated units of CS [ 34 ]. Furthermore, in Figure 8 b, in the DTGA curves, it can be seen that CS spheres present a first peak representing the maximum rate of degradation, which occurs at 290 °C (decomposition temperature).…”

Section: Resultsmentioning

confidence: 99%

Optimization by Central Composite Experimental Design of the Synthesis of Physically Crosslinked Chitosan Spheres

et al. 2020

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Chitosan (CS) has special properties such as biocompatibility, biodegradability, antibacterial, and biological activity which make this material is currently studied in various applications, including tissue engineering. There are different methods to modify the morphology of CS. Most use chemical crosslinking agents, however, those methods have disadvantages such as low polymer degradability and unwanted side effects. The objective of this research was to obtain CS spheres through the physical crosslinking of commercial CS without using crosslinking agents through a simple coacervation method. A central composite experimental design was used to optimize the synthesis of the CS spheres and by the response surface methodology it was possible to obtain CS spheres with the smallest diameter and the most regular morphology. With the optimal formulation (CS solution 1.8% (w/v), acetic acid (AAC) solution 1% (w/v), sodium hydroxide (NaOH) solution 13% (w/v), relative humidity of (10%) and needle diameter of 0.6 mm), a final sphere diameter of 1 mm was obtained. Spheres were characterized by physical, chemical, thermal, and biological properties in simulated body fluid (SBF). The results obtained allowed us to understand the effect of the studied variables on the spheres’ diameter. An optimized condition facilitated the change in the morphology of the CS while maintaining its desirable properties for use in tissue engineering.

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“…There was a weight loss of 5% around 250 C. This weight loss corresponds to the desorption of physically adsorbed water on the sample surfaces. 28 Aer this temperature, the weight loss curves become increasingly pronounced up to a temperature of 450 C for samples with CS sheets and spheres, and at 470 C for the control sample. Therefore, it can be said that CS decreases the thermal stability of the bone cements.…”

Section: Morphology Studiesmentioning

confidence: 96%

Influence of the chitosan morphology on the properties of acrylic cements and their biocompatibility

et al. 2020

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Al2O3/chitosan nanocomposite: Preparation, characterization and kinetic study of its thermal degradation

Cited by 15 publications

References 35 publications

Construction of improved isothermal TTT cure diagram based on an epoxy–amine thermoset

Construction of improved isothermal TTT cure diagram based on an epoxy–amine thermoset

Optimization by Central Composite Experimental Design of the Synthesis of Physically Crosslinked Chitosan Spheres

Influence of the chitosan morphology on the properties of acrylic cements and their biocompatibility

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