Synthesis and characterization of a biopolymer of glycerol and macadamia oil

Pires, Osmar Antonio Baldo; Alarcon, Rafael Turra; Gaglieri, Caroline; Silva‐Filho, Luiz Carlos da; Bannach, Gilbert

doi:10.1007/s10973-018-7922-3

Cited by 11 publications

(5 citation statements)

References 29 publications

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“…The MO is stable up to 270.0 °C with two steps of mass loss by TG curve. However, applying the derivative (DTG), the first mass loss (270.0‐476.1 °C) clearly has a complex, overlapped, and consecutive degradation with two maximum degradation rates (MDR) of 11.1 % min −1 (394.2 °C) and 11.2 % min −1 (415.7 °C), which can be related to triglyceride structure degradation [32] ( Δm =93.6 %) and related to a peak at 393.0 °C in DTA curve (exothermic). The carbonaceous material oxidation and degradation occurs between 476.1 °C and 610.5 °C with Δm =6.4 % and a exothermic peak at 516.9 °C seen in DTA curve.…”

Section: Resultsmentioning

confidence: 99%

AIE Effect by Oxygen Clustering in Vegetable Oil‐Based Polymers

et al. 2021

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Vegetable oil has been widely used to synthesize monomers and polymers in different fields. Some authors have found different polymers in maleinized vegetable oil; however, they have not described the luminescent properties of the polymers in an intensive way. This work aimed to synthesize new polymers from macadamia oil using diethylene glycol and glycerol as crosslinkers and their characterization The results obtained by spectroscopic analyses confirmed the incorporation of anhydride, as well as the reactions for the final polymers. Results from UV-Vis showed that maleinized macad-amia oil presented an aggregation-induced emission effect with solvatochromic effect with absorption at 201.6 nm (ethanol) and 241.8 nm (chloroform), which was corroborated by theoretical calculations. Moreover, the luminescent property exhibited by both obtained polymers was kept even after the swelling test, and powdering the samples. Therefore, these polymers, synthetized in a fast way and without catalyst, open a new field of renewable and sustainable materials with luminescent properties that can be applied in technological fields, such as solar cells and fluorescent sensors.

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Section: Resultsmentioning

confidence: 99%

AIE Effect by Oxygen Clustering in Vegetable Oil‐Based Polymers

et al. 2021

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“…The first step of mass loss occurs in the range of 260.8 ºC to 488.4 ºC, with a mass loss (m) of 96.3%, and is associated with the exothermic peak at 384.3 ºC in the DTA curve. This mass loss is related to the degradation and oxidation of unsaturated fatty acid chains, which degrade by radical processes with O2 causing a dehydrogenation process resulting in total degradation of all the fatty chains (saturated and unsaturated) (Pires et al, 2019;Gaglieri et al, 2019). Furthermore, it was possible to calculate the maximum degradation rate (MDR) of this step, using the DTG curve, which was equal to 14.7 % min -1 .…”

Section: Tg/dtg-dta and Dscmentioning

confidence: 99%

Spectroscopic characterization and thermal behavior of baru nut and macaw palm vegetable oils and their epoxidized derivatives

Alarcon

Gaglieri

Lamb

et al. 2020

Industrial Crops and Products

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The ability to produce new and renewable, epoxidized Brazilian vegetable oils from baru nut (Dipteryx alata Vogel) and macaw palm (Acrocomia aculeata) oil, using a fast and clean heterogeneous catalytic method, was investigated. The Wijs method and Proton Nuclear Magnetic Resonance ( 1 H-NMR) analysis were utilized, and compared to one another, to calculate the iodine value (IV), average number of double bonds (DBaverage) and fatty acid content, and thus degree of epoxidation, for both vegetable oils. This analysis indicated that alkene conversions of 100 and 95.3% were obtained for baru nut oil and macaw palm oil, respectively; which is an excellent result when compared with some works in literature. The epoxidized Baru nut oil is a solid at room temperature, which was related to the percentage of mono-unsaturated fatty acids present in its structure. Epoxide samples were also analyzed via mid-Infrared Spectroscopy and 13 C NMR analysis. Thermogravimetry-differential thermal analysis (TG-DTA) was used to determine the thermal stability of these epoxidized oils. Differential Scanning Calorimetry (DSC) also provided information about their crystallization, melting and solid-solid transition processes.

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“…Functionalization is not expected to change the reaction sequence but only modify the mechanism and stabilize the crystalline phase. Non-isothermal kinetics could investigate the modification in the reaction mechanism, as data are obtained in situ, which is considered an advantage and, therefore, has been applied to several materials [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] . Thus, this study aims *e-mail: aroldo.magdalena@unesp.br to investigate the influence of EDTA functionalization on thermal behavior and the sequence of reactions observed when heating Fe 3 O 4 nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

The Effect of EDTA Functionalization on Fe3O4 Thermal Behavior

et al. 2022

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The surface of Fe 3 O 4 nanoparticles is very reactive and can oxidize to γ-Fe 2 O 3 (maghemite) and α-Fe 2 O 3 (hematite) structures. Based on this, the oxidation process of Fe 3 O 4 nanoparticles must be prevented, and one of the strategies is surface functionalization with organic or inorganic molecules. Thus, this study analyzed the thermal behavior of Fe 3 O 4 and Fe 3 O 4 -EDTA nanoparticles using X-ray diffraction (XRD), simultaneous thermogravimetry-differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC). Results showed that γ-Fe 2 O 3 was obtained as an intermediate in Fe 3 O 4 and Fe 3 O 4 -EDTA decomposition, as confirmed by TG-DTA and DSC curves. Moreover, Fe 3 O 4 -EDTA exhibited a temperature peak (T p = 573.5°C) of phase transformation (γ-Fe 2 O 3 → α-Fe 2 O 3 ) higher than that of Fe 3 O 4 (T p = 533.0°C), confirming that EDTA molecules stabilized the nanoparticles efficiently. The kinetic behavior of samples changed, and the activation energy for functionalized samples decreased.

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Synthesis and characterization of a biopolymer of glycerol and macadamia oil

Cited by 11 publications

References 29 publications

AIE Effect by Oxygen Clustering in Vegetable Oil‐Based Polymers

AIE Effect by Oxygen Clustering in Vegetable Oil‐Based Polymers

Spectroscopic characterization and thermal behavior of baru nut and macaw palm vegetable oils and their epoxidized derivatives

The Effect of EDTA Functionalization on Fe3O4 Thermal Behavior

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