Synthesis and characterization of poly(methyl methacrylate)-boehmite nanocomposites by direct microemulsion polymerization combined with the in-situ sol-gel method

Castellanos, S.G.; Fernández, V. V. A.; Aguilar, Jacobo; Moscoso-Sánchez, Francisco Javier; Ceja, Israel; Canché‐Escamilla, G.; Barrera, A.

doi:10.1016/j.polymer.2018.12.053

Cited by 10 publications

(8 citation statements)

References 28 publications

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“…The parallel mechanism can contribute to the augmentation in the polidispersity in the AuNPs formation stage for the concentrations 0.7, 1 and 1.3 mM. The average crystal size ( L ) was determined for the different concentrations from diffractograms ( Table 2 ), by means of the Sherrer equation [ 25 ]:

where

is the wavelength,

is the constant related to the crystal size, known as the shape factor, which commonly has a value of 0.9,

is the line broadening at one half the maximal intensity and

is the Bragg angle. L was calculated from different crystalline planes including (111), (200), (220) and (311).…”

Section: Resultsmentioning

confidence: 99%

“…In the Kubelka–Munk equation, n = 1/2 was used because the nanostructures and films were prepared at low temperatures. Therefore, there are no thermal effects that influence the Eg , and its structure does not change under the temperature conditions studied [ 25 ]. The spectra of Figure 8 exhibit absorption bands between 530 and 590 nm due to the PVA films with chitosan-AuNPs/SWCNT-COOH nanostructures.…”

Section: Resultsmentioning

confidence: 99%

“…The UV–Vis spectra obtained from an UV-Vis-NIR UV-3600 spectrophotometer (Shimadzu, Tokyo, Japan) were used to determine the band gap energy ( Eg ) of the PVA/chitosan-AuNPs/(SWCNT-COOH) nanostructured films, with a films sample holder, and the spectra were recorded at 190–800 nm. From the spectra, the Eg values were calculated by using the Kubelka–Munk equation (1) according to direct transition, whereas: n = 1/2 [ 25 , 26 ].

where F(R) , h , v , B, Eg and n are the Kubelka–Munk function, Planck constant, light frequency, specific constant of material, energy band gap and nature of the transition, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Characterization and Electrical Properties of PVA Films with Self-Assembled Chitosan-AuNPs/SWCNT-COOH Nanostructures

et al. 2020

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Nanostructured films with electrical conductivity in the semiconductor region were prepared in a polymeric matrix of poly(vinyl alcohol) (PVA) with nanostructures of chitosan-gold nanoparticles (AuNPs)/single-wall carbon nanotubes carboxylic acid functionalized (SWCNT-COOH) (chitosan-AuNPs/SWCNT-COOH) self-assembled. Dispersion light scattering (DLS) was used to determine the average particle sizes of chitosan-AuNPs, z-average particle size (Dz) and number average particle size (Dn), and the formation of crystalline domains of AuNPs was demonstrated by X-ray diffraction (XRD) patterns and observed by means of transmission electron microscopy (TEM). The electrostatic interaction was verified by Fourier transform infrared spectroscopy (FTIR). The electrical conductivity of PVA/chitosan-AuNPs/SWCNT-COOH was determined by the four-point technique and photocurrent. The calculated Dn values of the chitosan-AuNPs decreased as the concentration of gold (III) chloride trihydrate (HAuCl4·3H2O) increased: the concentrations of 0.4 and 1.3 mM were 209 and 90 nm, respectively. Average crystal size (L) and number average size (D) of the AuNPs were calculated in the range of 13 to 24 nm. Electrical conductivity of PVA/chitosan-AuNPs/SWCNT-COOH films was 3.7 × 10−5 σ/cm determined by the four-point technique and 6.5 × 10−4 σ/cm by photocurrent for the SWCNT-COOH concentration of 0.5 wt.% and HAuCl4·3H2O concentration of 0.4 mM. In this investigation, the protonation of the amine group of chitosan is fundamental to prepare PVA films with nanostructures of self-assembled chitosan-AuNPs/SWCNT-COOH.

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where

is the wavelength,

is the constant related to the crystal size, known as the shape factor, which commonly has a value of 0.9,

is the line broadening at one half the maximal intensity and

is the Bragg angle. L was calculated from different crystalline planes including (111), (200), (220) and (311).…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

where F(R) , h , v , B, Eg and n are the Kubelka–Munk function, Planck constant, light frequency, specific constant of material, energy band gap and nature of the transition, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Characterization and Electrical Properties of PVA Films with Self-Assembled Chitosan-AuNPs/SWCNT-COOH Nanostructures

et al. 2020

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“…Castellanos et al. 36 designed PMMA/boehmite nanocomposite through in situ sol-gel preparation. The commercially available boehmite was used.…”

Section: Polymer/boehmite Nanocompositementioning

confidence: 99%

A review of current knowledge and future trends in polymer/boehmite nanocomposites

Kausar

2021

Journal of Plastic Film & Sheeting

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Boehmite [bey-mahyt] is a unique aluminum oxide hydroxide nanostructure. It consists of nanosheets of octahedral aluminum ions with surface hydroxyl groups. Owing to exceptional reinforcing behavior, boehmite nanoparticles have gained immense attention as polymeric nanofillers. Essential matrices used with the boehmite based nanocomposites include poly(methyl methacrylate), polyethylene, polypropylene, polyamide, epoxy, and other polymers. In this review, all-inclusive considerations on the design, morphology, mechanical, thermal, electrical, ion conducting, flame retardancy, electrochemical, and other physical properties, and advances related to the polymer/boehmite nanocomposites are presented. The polymer/boehmite nanocomposites have been employed for the membranes (water filtration/dye removal), coatings (anti-corrosion/self-healing), Li-ion batteries, and non-flammability purposes.

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“…In the literature, various preparation techniques have been used to synthesize these nanocomposite materials. The most commonly methods used are in situ polymerization, 1 emulsion polymerization, 2 microemulsion polymerization, 3 solution mixing, 4 sol–gel method 5 and melt blending. 6 Many researchers have reported that the incorporation of inorganic fillers into polymer matrix can significantly improve a number of desirable properties, such as mechanical strength, 7 thermal stability, 8 barrier properties, 9 and wear resistance.…”

Section: Introductionmentioning

confidence: 99%

Poly(methyl methacrylate)/SiO₂ nanocomposites: Effects of the molecular interaction strength on thermal properties

Boulerba

Zoukel

2021

Polymers and Polymer Composites

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Poly(methyl methacrylate)/silica nanocomposites membranes were prepared by simple solution mixing method using three different solvents (acetone, acetonitrile and chloroform). The structure and thermal properties of these nanocomposites were investigated by fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and environmental scanning electron microscope (ESEM). The infrared spectra confirm that the strongest H-bond interaction between the PMMA and silica was found when using chloroform solvent. In the case of thermal properties, the DSC and TGA analyses show significant improvement in thermal stability and glass transition temperature (Tg). Furthermore, the ESEM micrographs prove the structure stability of these synthesized nanocomposites. The results demonstrate that the solvent that lead to form the strongest H-bond interaction between the PMMA carbonyl groups and silica silanol groups (as chloroform solvent) will be more efficient in the synthesis of PMMA/SiO2 nanocomposites.

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Synthesis and characterization of poly(methyl methacrylate)-boehmite nanocomposites by direct microemulsion polymerization combined with the in-situ sol-gel method

Cited by 10 publications

References 28 publications

Characterization and Electrical Properties of PVA Films with Self-Assembled Chitosan-AuNPs/SWCNT-COOH Nanostructures

Characterization and Electrical Properties of PVA Films with Self-Assembled Chitosan-AuNPs/SWCNT-COOH Nanostructures

A review of current knowledge and future trends in polymer/boehmite nanocomposites

Poly(methyl methacrylate)/SiO₂ nanocomposites: Effects of the molecular interaction strength on thermal properties

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Synthesis and characterization of poly(methyl methacrylate)-boehmite nanocomposites by direct microemulsion polymerization combined with the in-situ sol-gel method

Cited by 10 publications

References 28 publications

Characterization and Electrical Properties of PVA Films with Self-Assembled Chitosan-AuNPs/SWCNT-COOH Nanostructures

Characterization and Electrical Properties of PVA Films with Self-Assembled Chitosan-AuNPs/SWCNT-COOH Nanostructures

A review of current knowledge and future trends in polymer/boehmite nanocomposites

Poly(methyl methacrylate)/SiO2 nanocomposites: Effects of the molecular interaction strength on thermal properties

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Poly(methyl methacrylate)/SiO₂ nanocomposites: Effects of the molecular interaction strength on thermal properties