Structural, Optical and Thermal Characterizations of PVA/MAA:EA Polyblend Films

Siddaiah, T.; Ojha, Pravakar; Kumar, Neeruganti O. Gopal Velikanti Ramesh; Chekuri, Ramu

doi:10.1590/1980-5373-mr-2017-0987

Cited by 100 publications

(39 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The T g of PVA is 96°C, and this is consistent with the previously reported results (it was recorded at 96.3°C) ( [21] cited in [22]), and it shifted after the addition of bentonite to 95°C for PVA/NaB with a clear peak and to approximately 94°C with a weak peak of PVA/SB, whereas the peak of T g was not observed in the DSC curve of PVA/SB2. Strawhecker and Manias [23] reported that "the fully intercalated PVA hybrids [i.e.…”

Section: Analysis Of Thermal and Flammability Propertiessupporting

confidence: 92%

“…The second stage can be attributed to the decomposition of the side chain (-OH) of PVA [12,22], and the weight loss was about 75% with a strong peak in the DrTG curve. On the other hand, the third stage can be attributed to the decomposition of the main chain (C-C backbone) of PVA [12,22], and the weight loss was about 15%. The nanocomposite samples showed higher onset temperatures (by 10-20°C) for both the second and third stages, as shown in Table 3.…”

Section: Analysis Of Thermal and Flammability Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Effect of cationic-surfactant-modified Saudi bentonite on the thermal and flammability properties of poly(vinyl alcohol)-based nanocomposite films

Alshabanat

Al-Anazy

2019

Journal of Taibah University for Science

View full text Add to dashboard Cite

In this study, poly(vinyl alcohol) (PVA)-modified Saudi bentonite nanocomposite films were prepared using the solution method. Two surfactants, cetylpyridinium chloride and tetrabutyl phosphonium bromide, were used to modify the clay after the ion-exchange process by Na + ions. The effect of the addition of modified Saudi bentonite (2.5%) on the thermal and flammability properties of the nanocomposite films was investigated. The prepared samples were characterized using Fourier-transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy. Thermogravimetric analysis and differential scanning calorimetry were carried out to observe the thermal behaviour of the PVA-based nanocomposite films. Vertical flammability tests (UL94 VB) were also carried out to study the flame retardancy behaviour of the nanocomposite films. The nanocomposite films showed better flammability than pure PVA, wherein the ignition time of the nanocomposites increased and flame propagation rate decreased. The thermal stability of the nanocomposites increased by approximately 10% for the onset and endset temperature of decomposition. The type of surfactant played an important role in dispersion of the clay into the polymeric matrix and enhancing the flammability properties of the films wherein the tetrabutyl phosphonium bromide was better flame retardant than cetylpyridinium chloride. ARTICLE HISTORY

show abstract

Section: Analysis Of Thermal and Flammability Propertiessupporting

confidence: 92%

Section: Analysis Of Thermal and Flammability Propertiesmentioning

confidence: 99%

Effect of cationic-surfactant-modified Saudi bentonite on the thermal and flammability properties of poly(vinyl alcohol)-based nanocomposite films

Alshabanat

Al-Anazy

2019

Journal of Taibah University for Science

View full text Add to dashboard Cite

show abstract

“…Pure PVA has an absorption edge value of around 6.26 eV, while the organocopper-containing samples reveal a wide shift to lower photon energy. Siddaiah et al [62] reported that the value of absorption edge for pure PVA lies at 5.94. The absorption edge value of the current study for pure PVA corresponds to that attained in the study of Siddaiah et al The wide shifting of the absorption edge can be attributed to the distribution and complexation between organocopper and PVA matrix.…”

Section: Resultsmentioning

confidence: 99%

From Green Remediation to Polymer Hybrid Fabrication with Improved Optical Band Gaps

Brza

Aziz

Anuar

et al. 2019

IJMS

View full text Add to dashboard Cite

The present work proposed a novel approach for transferring high-risk heavy metals tometal complexes via green chemistry remediation. The method of remediation of heavy metals developed in the present work is a great challenge for global environmental sciences and engineering because it is a totally environmentally friendly procedure in which black tea extract solution is used. The FTIR study indicates that black tea contains enough functional groups (OH and NH), polyphenols and conjugated double bonds. The synthesis of copper complex was confirmed by the UV-vis, XRD and FTIR spectroscopic studies. The XRD and FTIR analysis reveals the formation of complexation between Cu metal complexes and Poly (Vinyl Alcohol) (PVA) host matrix. The study of optical parameters indicates that PVA-based hybrids exhibit a small optical band gap, which is close to inorganic-based materials. It was noted that the absorption edge shifted to lower photon energy. When Cu metal complexes were added to PVA polymer, the refractive index was significantly tuned. The band gap shifts from 6.2 eV to 1.4 eV for PVA incorporated with 45 mL of Cu metal complexes. The nature of the electronic transition in hybrid materials was examined based on the Taucs model, while a close inspection of the optical dielectric loss was also performed in order to estimate the optical band gap. The obtained band gaps of the present work reveal that polymer hybrids with sufficient film-forming capability could be useful to overcome the drawbacks associated with conjugated polymers. Based on the XRD results and band gap values, the structure-property relationships were discussed in detail.

show abstract

“…The pattern is characteristic of an amorphous phase with the main halo of the typical peak at 2θ of 17.7° and another low intensity peak at 2θ of 20.2°. [ 30 ]…”

Section: Resultsmentioning

confidence: 99%

Antimicrobial ZnO Nanoparticle–Doped Polyvinyl Alcohol/Pluronic Blends as Active Food Packaging Films

Amin

Partila

El‐Rehim

et al. 2020

Part & Part Syst Charact

View full text Add to dashboard Cite

Today, plastic waste has been highlighted as one of the greatest threats to the environment. These environmental concerns and the increased necessity for safe food packaging have inspired scientists to focus on the development of active biodegradable materials. Herein, a novel poly(vinyl alcohol)/pluronic/ZnO nanocomposite film (PVA/PLUR/ZnO) is introduced as an active packaging material with enhanced antimicrobial activity. Gamma irradiation is used as a “green” route to prepare ZnO nanoparticles via a polymer pyrolysis method. The as‐prepared ecofriendly ZnO nanoparticles are characterized and incorporated into the PVA/PLUR matrix in different concentrations. Transmission electron microscopy and dynamic light scattering measurements prove that ZnO nanoparticles have a mean particle size of 30 nm with a spherical‐like morphology. Morphological and structural characterization confirm the successful incorporation of ZnO into the PVA/PLUR matrix, which in turn enhances the thermal and barrier properties of PVA/PLUR/ZnO nanocomposite films. On the other hand, the opacity of blends is increased. The PVA/PLUR/ZnO composites exhibit broad‐spectrum antimicrobial activity against Gram‐positive, Gram‐negative bacterial pathogens, and fungi, and the activity increases with increasing concentrations of ZnO nanoparticles. These results introduce PVA/PLUR/ZnO films as effective antimicrobial materials for active food‐packaging applications.

show abstract

Structural, Optical and Thermal Characterizations of PVA/MAA:EA Polyblend Films

Cited by 100 publications

References 26 publications

Effect of cationic-surfactant-modified Saudi bentonite on the thermal and flammability properties of poly(vinyl alcohol)-based nanocomposite films

Effect of cationic-surfactant-modified Saudi bentonite on the thermal and flammability properties of poly(vinyl alcohol)-based nanocomposite films

From Green Remediation to Polymer Hybrid Fabrication with Improved Optical Band Gaps

Antimicrobial ZnO Nanoparticle–Doped Polyvinyl Alcohol/Pluronic Blends as Active Food Packaging Films

Contact Info

Product

Resources

About